Formation, sintering, and electrical conductivity of (Nd_1−xCa_x)CrO₃ (0≤x≤0.25) using citric acid as a gelling agent

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• 作者：Hirota ; Ken ; Kunifusa ; Yoshiyuki ; Yoshinaka ; Masaru ; Yamaguchi ; Osamu
• 关键词：A. Ceramics ; B. Chemical synthesis ; D. Electrical properties ; D. Microstructure
• 刊名：Materials Research Bulletin
• 出版年：2002
• 出版时间：November 20, 2002
• 年：2002
• 卷：37
• 期：14
• 页码：2335-2344
• 全文大小：250 K

文摘

In Ca²⁺-substituted NdCrO₃, single-phase perovskite compounds (Nd_1−xCa_x)CrO₃, where x=0–0.25, have been formed by a citric acid processing. (Nd_1−xCa_x)CrO₃ powders consisting of submicrometer-size particles are sinterable; dense materials can be fabricated by sintering for 2h at 1700°C under atmospheric pressure. The relative densities, grain sizes, and electrical conductivities increase with increased Ca²⁺ content. (Nd_0.75Ca_0.25)CrO₃ materials show an excellent electrical conductivity of 1.9×10Sm⁻¹ at 1000°C.