Preparation and electrical properties of monophase cubic spinel, Mn1.5Co0.95Ni0.55O4, derived from rock salt type oxide
Preparation and electrical properties of monophase cubic spinel, Mn1.5Co0.95Ni0.55O4, derived from rock salt type oxide
复制标题
岩盐型氧化物单相立方尖晶石 Mn1.5Co0.95Ni0.55O4 的制备及其电性能
DOI：
10.1007/bf00351620
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发表时间：
1995
影响因子：
4.5
通讯作者：
Tadashi Sasamoto
中科院分区：
文献类型：
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作者：
Takashi Yokoyama;K. Kondou;K. Komeya;T. Meguro;Y. Abe;Tadashi Sasamoto
本研究的目的是制备由单相立方尖晶石型氧化物Mn1.5Co0.95Ni0.55O4组成的烧结体，并评价其电性能。发现在氮气中从1400 °C冷却至1000 °C不影响在1400 °C下形成的烧结岩盐型氧化物的保存。单相立方尖晶石的无裂纹烧结体可以通过在1000 °C下在空气中热处理来获得，使用以500 °C min-1的速率从1400 °C冷却的样品。需要在1000 °C下在空气中超过48小时的热处理时间来将岩盐型结构转化为完美的立方尖晶石结构。发现在这项工作中合成的烧结立方尖晶石氧化物的电导率δ在空气中在100和200 °C下以及在氮气中在100、200和300 °C下稳定。烧结的尖晶石氧化物是p型半导体，基于小极化子跳跃导电。本征空穴浓度n估计为常数，数值为1.6-1.8× 1028 m −3。在两种气氛中，迁移率μ随着退火温度的增加而呈指数增加，表明δ的变化取决于μ。
The purpose of this study was to prepare a sintered body consisting of monophase cubic spinel type oxide, Mn1.5Co0.95Ni0.55O4, and to evaluate its electrical properties. It was found that cooling from 1400 to 1000 °C in nitrogen did not affect the preservation of the sintered rock salt type oxide formed at 1400 °C. A crack free sintered body of monophase cubic spinel may be obtained by heat treatment at 1000 °C in air, using a specimen cooled from 1400 °C at a rate of 500 °C min−1. A heat treatment time in air at 1000 °C of more than 48 h was required to convert the rock salt type structure into a perfect cubic spinel structure. The electrical conductivity, δ, of the sintered cubic spinel oxide synthesized in this work was found to be stable at 100 and 200 °C in air and at 100, 200 and 300 °C in nitrogen. The sintered spinel oxide was ap-type semiconductor, based on small polaron hopping conduction. The intrinsic hole concentration,n, was estimated to be constant, with a value of 1.6–1.8×1028m−3. The mobility, μ, increased exponentially with increasing annealing temperature in both atmospheres, suggesting that the change in δ is dependent on μ.