start-ver=1.4 cd-journal=joma no-vol=42 cd-vols= no-issue= article-no= start-page=1806 end-page=1810 dt-received= dt-revised= dt-accepted= dt-pub-year=2026 dt-pub=202605 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=An electric field temporarily strengthens zirconia ceramics en-subtitle= kn-subtitle= en-abstract= kn-abstract=By applying an electric field to yttria-stabilized zirconia (8YSZ) equipped with an inert electrode, oxide ions are localized near the positive electrode, causing it to expand. When polarization was performed under different conditions, it was possible to strengthen the material to 1.5 times that of an untreated sample. The lattice constant of the positive electrode surface after polarization was larger than before polarization. When the Vickers hardness of the positive electrode surface was measured by changing the test load, the smaller the load, the higher the hardness value. Polarization caused oxide ions to move near the positive electrode, filling in the defects and generating an expanded layer with a large lattice constant. It is believed that this was subjected to compressive stress from the bulk layer, which had not changed in volume, resulting in an increase in strength. en-copyright= kn-copyright= en-aut-name=KishimotoAkira en-aut-sei=Kishimoto en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=ShimizuTakahiro en-aut-sei=Shimizu en-aut-mei=Takahiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=NishiyamaMitsuru en-aut-sei=Nishiyama en-aut-mei=Mitsuru kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=KondoShinya en-aut-sei=Kondo en-aut-mei=Shinya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=TeranishiTakashi en-aut-sei=Teranishi en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=4 en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=5 en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= en-keyword=Poling kn-keyword=Poling en-keyword=Zirconia ceramics kn-keyword=Zirconia ceramics en-keyword=Strengthening kn-keyword=Strengthening en-keyword=Internal stress kn-keyword=Internal stress END start-ver=1.4 cd-journal=joma no-vol=73 cd-vols= no-issue=3 article-no= start-page=55 end-page=59 dt-received= dt-revised= dt-accepted= dt-pub-year=2026 dt-pub=20260315 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Low Temperature Formation of Dense Yttria-Stabilized Zirconia Layer Using Hot Isostatic Pressing kn-title=熱間静水圧加圧法を用いたイットリア安定化ジルコニア緻密層の低温形成 en-subtitle= kn-subtitle= en-abstract= kn-abstract=The sintering conditions using hot isostatic press (HIP) of yttria-stabilized zirconia (YSZ) were investigated to obtain a dense YSZ layer at low sintering temperature such as 1000°C for an electrolyte of metal-supported solid oxide fuel cell. It was found that a dense YSZ pellet with relative density of 93% could be obtained under a sintering condition of 1000°C-10 hours with HIP in 195 MPa. On the other hand, in X-ray diffraction analysis of the dense YSZ pellet, peaks of the monoclinic phase were slightly detected in addition to peaks of the cubic phase. From energy dispersive X-ray spectroscopy analysis, a small amount of boron was detected in the dense YSZ pellet. It is considered that the YSZ crystalline phase transformation of cubic to monoclinic phase was occurred by the boron diffusion from the diffusion barrier coating of metal foil capsule used for the HIP. en-copyright= kn-copyright= en-aut-name=MANABEKyohei en-aut-sei=MANABE en-aut-mei=Kyohei kn-aut-name=真鍋享平 kn-aut-sei=真鍋 kn-aut-mei=享平 aut-affil-num=1 ORCID= en-aut-name=ECHIGOMitsuaki en-aut-sei=ECHIGO en-aut-mei=Mitsuaki kn-aut-name=越後満秋 kn-aut-sei=越後 kn-aut-mei=満秋 aut-affil-num=2 ORCID= en-aut-name=KISHIMOTOAkira en-aut-sei=KISHIMOTO en-aut-mei=Akira kn-aut-name=岸本昭 kn-aut-sei=岸本 kn-aut-mei=昭 aut-affil-num=3 ORCID= affil-num=1 en-affil=Osaka Gas Co. Ltd. kn-affil=大阪ガス（株） affil-num=2 en-affil=Osaka Gas Co. Ltd. kn-affil=大阪ガス（株） affil-num=3 en-affil=Institute of Academic and Research, Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil=岡山大学学術研究院環境生命自然科学学域 en-keyword=dense yttria-stabilized zirconia kn-keyword=dense yttria-stabilized zirconia en-keyword=hot isostatic press kn-keyword=hot isostatic press en-keyword=low sintering temperature kn-keyword=low sintering temperature en-keyword=electrolyte kn-keyword=electrolyte en-keyword=metal-supported solid oxide fuel cell kn-keyword=metal-supported solid oxide fuel cell END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2025 dt-pub=20251202 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Enhanced Charge-Transfer Kinetics Enabled by ZrO2–Based Dielectric Layers in Lithium-Ion Batteries en-subtitle= kn-subtitle= en-abstract= kn-abstract=The development of high-rate capability lithium-ion batteries (LIBs) requires suppression of charge-transfer resistance (RCT) at electrode–electrolyte interfaces. Here, zirconia-based dielectric oxides (MZ; M = Y, Gd, Sm, Er, etc.) were introduced onto LiCoO2 (LCO) surfaces as electronically and ionically insulating modifiers to accelerate interfacial ion transport. Electrochemical impedance spectroscopy showed that Y2O3 modified ZrO2 (YZ) decoration reduced RCT from 75.8 Ω in reference LCO to 38.3 Ω, accompanied by a 2.3-fold improvement in capacity retention at 20C. Density functional theory molecular dynamics (DFT–MD) simulations showed that solvated Li ions coordinate with surface oxygen atoms in discharging, and that adsorption energies are governed by local charge distributions determined by stabilizing cations. Optimal adsorption activity, and thus the lowest RCT, occurred when the surface charge corrugation was balanced. These findings provide design principles for dielectric interface engineering to enhance rate capability of LIBs. en-copyright= kn-copyright= en-aut-name=TeranishiTakashi en-aut-sei=Teranishi en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=HigakiYusuke en-aut-sei=Higaki en-aut-mei=Yusuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=ImamuraTomonori en-aut-sei=Imamura en-aut-mei=Tomonori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=HoribeMotoki en-aut-sei=Horibe en-aut-mei=Motoki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=KondoShinya en-aut-sei=Kondo en-aut-mei=Shinya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=SasaokaChinatsu en-aut-sei=Sasaoka en-aut-mei=Chinatsu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=HirabaruHikaru en-aut-sei=Hirabaru en-aut-mei=Hikaru kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=KatayamaShingo en-aut-sei=Katayama en-aut-mei=Shingo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=NakayamaMasanobu en-aut-sei=Nakayama en-aut-mei=Masanobu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=KishimotoAkira en-aut-sei=Kishimoto en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= affil-num=1 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= affil-num=4 en-affil=Department of Advanced Ceramics, Nagoya Institute of Technology kn-affil= affil-num=5 en-affil=Department of Energy Engineering, Nagoya University kn-affil= affil-num=6 en-affil=R&D Laboratory, Nippon Denko Co., Ltd. kn-affil= affil-num=7 en-affil=R&D Laboratory, Nippon Denko Co., Ltd. kn-affil= affil-num=8 en-affil=R&D Laboratory, Nippon Denko Co., Ltd. kn-affil= affil-num=9 en-affil=Department of Advanced Ceramics, Nagoya Institute of Technology kn-affil= affil-num=10 en-affil=Graduate School of Natural Science and Technology, Okayama University kn-affil= en-keyword=lithium ion battery kn-keyword=lithium ion battery en-keyword=high rate capability kn-keyword=high rate capability en-keyword=charge transfer kn-keyword=charge transfer en-keyword=Li adsorption kn-keyword=Li adsorption en-keyword=dielectric interface kn-keyword=dielectric interface en-keyword=stabilized ZrO2 kn-keyword=stabilized ZrO2 END start-ver=1.4 cd-journal=joma no-vol=126 cd-vols= no-issue=1 article-no= start-page=012901 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2025 dt-pub=20250102 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Dynamic domain motion enhancing electro-optic performance in ferroelectric films en-subtitle= kn-subtitle= en-abstract= kn-abstract=With the rapid advancement of information technology, there is a pressing need to develop ultracompact and energy-efficient thin-film-based electro-optic (EO) devices. A high EO coefficient in ferroelectric materials is crucial. However, substrate clamping can positively or negatively influence various physical properties, including the EO response of these films, thus complicating the development of next-generation thin-film-based devices. This study demonstrates that reversible dynamic domain motion, achieved through substrate clamping, significantly enhances the EO coefficient in epitaxial ferroelectric rhombohedral Pb(Zr, Ti)O3 thin films, where the (111) and (⁠ 111⁠) domains coexist with distinct optical axes. In principle, this approach can be applied to different film-substrate systems, thereby contributing to the advancement of sophisticated EO devices based on ferroelectrics. en-copyright= kn-copyright= en-aut-name=KondoShinya en-aut-sei=Kondo en-aut-mei=Shinya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=OkamotoKazuki en-aut-sei=Okamoto en-aut-mei=Kazuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=SakataOsami en-aut-sei=Sakata en-aut-mei=Osami kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=TeranishiTakashi en-aut-sei=Teranishi en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=KishimotoAkira en-aut-sei=Kishimoto en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=NagasakiTakanori en-aut-sei=Nagasaki en-aut-mei=Takanori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=YamadaTomoaki en-aut-sei=Yamada en-aut-mei=Tomoaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= affil-num=1 en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Department of Energy Engineering, Nagoya University kn-affil= affil-num=3 en-affil=Japan Synchrotron Radiation Research Institute (JASRI) kn-affil= affil-num=4 en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=5 en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=6 en-affil=Department of Energy Engineering, Nagoya University kn-affil= affil-num=7 en-affil=Department of Energy Engineering, Nagoya University kn-affil= END start-ver=1.4 cd-journal=joma no-vol=14 cd-vols= no-issue=20 article-no= start-page=1677 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2024 dt-pub=20241018 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Colossal Dielectric Constant of Nanocrystalline/Amorphous Homo-Composite BaTiO3 Films Deposited via Pulsed Laser Deposition Technique en-subtitle= kn-subtitle= en-abstract= kn-abstract=We report the pulsed laser deposition (PLD) of nanocrystalline/amorphous homo-composite BaTiO3 (BTO) films exhibiting an unprecedented combination of a colossal dielectric constant (epsilon(r)) and extremely low dielectric loss (tan delta). By varying the substrate deposition temperature (T-d) over a wide range (300-800 degrees C), we identified T-d = 550 degrees C as the optimal temperature for growing BTO films with an epsilon(r) as high as similar to 3060 and a tan delta as low as 0.04 (at 20 kHz). High-resolution transmission electron microscopy revealed that the PLD-BTO films consist of BTO nanocrystals (similar to 20-30 nm size) embedded within an otherwise amorphous BTO matrix. The impressive dielectric behavior is attributed to the combination of highly crystallized small BTO nanograins, which amplify interfacial polarization, and the surrounding amorphous matrix, which effectively isolates the nanograins from charge carrier transport. Our findings could facilitate the development of next-generation integrated dielectric devices. en-copyright= kn-copyright= en-aut-name=KondoShinya en-aut-sei=Kondo en-aut-mei=Shinya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=MurakamiTaichi en-aut-sei=Murakami en-aut-mei=Taichi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=PichonLoick en-aut-sei=Pichon en-aut-mei=Loick kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=Leblanc-LavoieJoel en-aut-sei=Leblanc-Lavoie en-aut-mei=Joel kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=TeranishiTakashi en-aut-sei=Teranishi en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=KishimotoAkira en-aut-sei=Kishimoto en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=El KhakaniKhakani, My Ali en-aut-sei=El Khakani en-aut-mei=Khakani, My Ali kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= affil-num=1 en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=2 en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=3 en-affil=Institut National de la Recherche Scientifique (INRS), Centre Énergie, Matériaux et Télécommunications kn-affil= affil-num=4 en-affil=Institut National de la Recherche Scientifique (INRS), Centre Énergie, Matériaux et Télécommunications kn-affil= affil-num=5 en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=6 en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University kn-affil= affil-num=7 en-affil=Institut National de la Recherche Scientifique (INRS), Centre Énergie, Matériaux et Télécommunications kn-affil= en-keyword=BaTiO3 kn-keyword=BaTiO3 en-keyword=thin film kn-keyword=thin film en-keyword=colossal dielectric constant kn-keyword=colossal dielectric constant en-keyword=nanocrystalline/amorphous homo-composite kn-keyword=nanocrystalline/amorphous homo-composite en-keyword=pulsed laser deposition kn-keyword=pulsed laser deposition END start-ver=1.4 cd-journal=joma no-vol=65 cd-vols= no-issue=14 article-no= start-page=2197 end-page=2200 dt-received= dt-revised= dt-accepted= dt-pub-year=2011 dt-pub=20110731 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Effect of varying the ratio of matrix/dispersoid particle size on the piezoresistivity of alumina/carbon-black composite ceramics en-subtitle= kn-subtitle= en-abstract= kn-abstract=Alumina/carbon-black composite ceramics with different percolation thresholds were fabricated by changing the size ratio of constituent particles. The dependence of resistivity on pressure was established for each sample. The compositional dependence of resistivity can be explained by percolation theory. The percolation threshold decreases with increasing alumina/carbon-black particle size ratio. The pressure dependence of the resistivity increases as the composition approaches the percolation threshold. When the relative composition at the percolation threshold is fixed, the sensitivity increases with increasing matrix/dispersoid initial particle size ratio. en-copyright= kn-copyright= en-aut-name=KishimotoAkira en-aut-sei=Kishimoto en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TakagawaYuto en-aut-sei=Takagawa en-aut-mei=Yuto kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=TeranishiTakashi en-aut-sei=Teranishi en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=HayashiHidetaka en-aut-sei=Hayashi en-aut-mei=Hidetaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= affil-num=1 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University affil-num=2 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University affil-num=3 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University affil-num=4 en-affil= kn-affil=Division of Molecular and Material Science, Graduate School of Natural Science and Technology, Okayama University en-keyword=Percolation kn-keyword=Percolation en-keyword=Piezoresistivity kn-keyword=Piezoresistivity en-keyword=Pressure sensor kn-keyword=Pressure sensor en-keyword=Particle size kn-keyword=Particle size END start-ver=1.4 cd-journal=joma no-vol=34 cd-vols= no-issue=4 article-no= start-page=845 end-page=848 dt-received= dt-revised= dt-accepted= dt-pub-year=2008 dt-pub=200805 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Improvement of piezoresistance properties of silicon carbide ceramics through co-doping of aluminum nitride and nitrogen en-subtitle= kn-subtitle= en-abstract= kn-abstract=The piezoresistance coefficient was measured on co-doped silicon carbide ceramics. Evaluation samples of alpha-silicon carbide ceramics were first fabricated by glass capsule HIP method using powder mixture of silicon carbide and aluminum nitride with various ratios. The resultant aluminum nitride added silicon carbide ceramics were doped with nitrogen by changing the post-HIP nitrogen gas pressure. The lattice parameter increased with the amount of adding aluminum nitride indicating that the incorporated aluminum substituted smaller silicon atoms. After post-HIP treatment, lattice parameter then decreased with nitrogen gas pressure. The piezoresistive coefficient increased with the addition of aluminum nitride, it further increased with the nitrogen doping pressure. en-copyright= kn-copyright= en-aut-name=KishimotoAkira en-aut-sei=Kishimoto en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=OkadaYasuyuki en-aut-sei=Okada en-aut-mei=Yasuyuki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=HayashiHidetaka en-aut-sei=Hayashi en-aut-mei=Hidetaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= affil-num=1 en-affil= kn-affil=Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University affil-num=2 en-affil= kn-affil=Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University affil-num=3 en-affil= kn-affil=Division of Chemistry and Biochemistry, Graduate School of Natural Science and Technology, Okayama University en-keyword=HIP kn-keyword=HIP en-keyword=co-doping kn-keyword=co-doping en-keyword=donor kn-keyword=donor en-keyword=acceptor kn-keyword=acceptor en-keyword=silicon carbide kn-keyword=silicon carbide en-keyword=strain sensor kn-keyword=strain sensor END