Formation Region of Monophase with Cubic SpineL-type Structure in Mn-Fe-Ni Ternary System and Electrical Properties of Sintered-bodies Prepared from the Region

Mn-Fe-Ni三元系中立方脊柱L型结构单相的形成区域及该区域制备的烧结体的电性能

• 批准号: 17560593
• 负责人: YOKOYAMA Takashi
• 金额: $ 2.27万
• 依托单位: Yokohama National University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560593/
• 关键词: Mn-Fe-Ni Monophase Cubic Spinel-type Oxides; Sintered Body with Spinel-type Oxide; Phase Diagram; Electrical Conductivity; Seebeck Coefficient; Small Polaron Hopping Mechanism; Thermistor; スピネル単一相; Mn-Fe-Ni 3成分系酸化物; 焼結体; 電気的特性; Mn-Fe-Ni3成分系酸化物

First object of this study is to define the composition area of cubic spinel-type monophase oxide composed of Mn-Fe-Ni ternary system. The second is to investigate the preparation method for sintered bodies consisting of monophase with cubic spinel-type structure. The third is to evaluate the electrical properties of the sintered bodies. The region to be cubic spinel monophase at 1000℃ was recognized to be near on the line connecting the points of Mn:Fe:Ni=2.25:0:0.75 and 0.5:1.5:1. The bodies, in which a couple of oxides different from the crystal structure were contained, heated at 1400℃ for sintering were confirmed to be converted to monophase cubic spinel-type oxides by heat treatment at 1000℃ for 48 h in air. The electrical conductivities increased exponentially with increasing temperature, indicating that these oxides have intrinsic NTC thermistor characteristics. The electrical properties of the oxides were evaluated to be more stable compared to one on the market in measurement at 700℃ in nitrogen. It was concluded from the mobility and its temperature dependence that the electrical conduction is based on the small polaron hopping mechanism.

本研究的第一个目的是确定Mn-Fe-Ni三元系立方尖晶石型单相氧化物的组成区域。二是研究了立方尖晶石型单相烧结体的制备方法。第三是评价烧结体的电性能。在1000℃时为立方尖晶石单相的区域位于Mn：Fe：Ni=2.25：0：0.75和0.5：1.5：1的连线附近。在1400℃烧结的坯体中含有一对与晶体结构不同的氧化物，在空气中1000℃热处理48 h后，确认其转变为单相立方尖晶石型氧化物。随着温度的升高，电导率呈指数增长，表明这些氧化物具有本征NTC热敏电阻特性。在700℃的氮气中测量，氧化物的电性能被评价为比市场上的氧化物更稳定。从迁移率及其温度依赖性可以得出结论，导电是基于小极化子跳跃机制。

项目成果

Formation Region of Monophase with Cubic Spinel-type Oxides in Mn-Fe-Ni Ternary System

Mn-Fe-Ni三元系中立方尖晶石型氧化物单相的形成区域

• 发表时间: 2007
• 作者: Ryosuke;Ichida
• 通讯作者: Ichida