Formation Mechanism and In-situ Observation of Chemically Induced Formation Dynamics of Grain Boundary in Electro-ceramics

电陶瓷晶界化学诱导形成动力学的形成机理及原位观察

• 批准号: 09450242
• 负责人: MIZUTANI Nobuyasu
• 金额: $ 8.96万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09450242/
• 关键词: electroceramics; microstructure; liquid phase; grain boundary; thin film; varistor; zinc oxide; zirconium oxide

In the field of electro-ceramics, the liquid phase sintering techniques are used frequently in order to manufacture many ceramic chips at lower temperature. However, the phenomena including property change and appearance of electronic function beside only sintering behavior have not been studied.In this research, mainly the formation mechanism of grain boundary layer having different chemical constituent and structure with grain was studied on the point of chemical dynamics.(1) Establishment of the detailed phase diagram of ZnO-PrOィイD22-xィエD2 system up to 1600℃(2) The ZnO-PrOィイD22-xィエD2 system has no solid solution region and one eutectic point at 1328℃.(3) By addition of CoO, the liquidous temperature decresed to 1280℃.(4) The state of liquid phase in grain boundaries changed strongly with oxygen pressure.(5) By infilutration of PrOィイD22-xィエD2 to grain boundary region from the surface of pure ZnO sintered body, the good varisor wag formed.Through this study, we discussed the role of liquid phase to appearance of properties, etc. from the view point of chemical formation of grain boundary

在电陶瓷领域，为了在较低的温度下制造许多陶瓷芯片，经常使用液相烧结技术。然而，除了烧结行为外，还没有对其性能变化和电子函数的出现等现象进行研究。本研究主要从化学动力学的角度研究了随晶粒不同化学成分和结构的晶界层的形成机理。(1)建立了ZnO-PrO φ φ D22-x φ φ D2体系在1600℃温度下的详细相图(2)ZnO-PrO φ φ D22-x φ φ D2体系在1328℃温度下无固溶区，有一个共晶点。(3)添加CoO后，液温降至1280℃。(4)晶界液相状态随氧压变化较大。(5)由纯ZnO烧结体表面渗透到晶界区域的PrO γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ γ。通过本研究，从晶界化学形成的角度探讨了液相对材料性能的影响

项目成果

Naoki Wakiya, Sung-Yong Chun, Kazuo Shinozaki and Nobuyasu Mizutani: "Redox Reaction of Praseodymium Oxide in the ZnO Sintered Ceramics"J. of Solid State Chemistry. 149. 349-353 (2000)

Naoki Wakiya、Sung-Yong Chun、Kazuo Shinozaki 和 Nobuyasu Mizutani：“ZnO 烧结陶瓷中氧化镨的氧化还原反应”J。

N.Wakiya,S.Y.Chun,K.Shinozaki and N.Mizutani: "Redox reaction of Praseodymium Oxide in the ZnO Sintered Ceramics"J of Solid State Chem.. 149. 349-353 (2000)

N.Wakiya,S.Y.Chun,K.Shinozaki 和 N.Mizutani:“ZnO 烧结陶瓷中氧化镨的氧化还原反应”固体化学杂志 149. 349-353 (2000)

Sung-Yong Chun: "Electrically active grain boundaries in ZnO varistors by liquid-infiltration"J. of Materials Science : Materials in Electronics II,. 11. 73-80 (2000)

Sung-Yong Chun：“通过液体渗透在 ZnO 压敏电阻中产生电活性晶界”J。

桜井修: "半導性SrTiO_3単結晶接合界面の微構造と酸化還元処理によるI-V特性の変化"J.Ceram.Soc.Japan. 106. 308-311 (1998)

Osamu Sakurai：“半导体 SrTiO_3 单晶结界面的微观结构以及氧化还原处理导致的 I-V 特性变化”J.Ceram.Soc.Japan。106. 308-311 (1998)

Sung-Yong Chun,Kazuo Shinozaki and Nobuyasu Mizutani: "Electrically active grain boundaries ZnO varistors by Iiquid-infiltration method"J. Mater. Sci: Materials in Electronics. 11. 73-80 (2000)

Sung-Yong Chun，Kazuo Shinozaki和Nobuyasu Mizutani：“通过液体渗透法制备电活性晶界ZnO压敏电阻”J。