Microstructure and electrical properties of Ca_{1−m class="a-plus-plus">xm>} Er _{m class="a-plus-plus">xm>} MnO_{3−m class="a-plus-plus">δm>} powders prepared by hydrothermal technique

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• 作者：Liying Qi ; Sue Hao ; Yunjiao Li
• 关键词：CaMnO3 ; Er ; doping ; Hydrothermal technique ; Electrical properties
• 刊名：Research on Chemical Intermediates
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：43
• 期：1
• 页码：153-162
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Physical Chemistry; Inorganic Chemistry;
• 出版者：Springer Netherlands
• ISSN：1568-5675
• 卷排序：43

文摘

In order to decrease the resistivity of the CaMnO₃ powders for obtaining an excellent conductive material, we have prepared the Ca_{1−m class="EmphasisTypeItalic ">x}Er_xMnO_{3−m class="EmphasisTypeItalic ">δ} (0.30 ≤ m class="EmphasisTypeItalic ">x ≤ 0.75) powders through the hydrothermal technique, the effects of Er content, reaction time, and the type of solvent on the structure, morphology, and electrical properties of the Ca_{1−m class="EmphasisTypeItalic ">x}Er_xMnO_{3−m class="EmphasisTypeItalic ">δ} powders have been also studied. The resistivity of the Ca_{1−m class="EmphasisTypeItalic ">x}Er_xMnO_{3−m class="EmphasisTypeItalic ">δ} powders reached the lowest value of 1.290 kΩ m when x = 0.3, with deionized water as solvent, and reaction time of 15 days. The XRD patterns showed that all the Ca_{1−m class="EmphasisTypeItalic ">x}Er_xMnO_{3−m class="EmphasisTypeItalic ">δ} powders owned well-crystallized perovskite structure, which illustrated that the Ca_{1−m class="EmphasisTypeItalic ">x}Er_xMnO_{3−m class="EmphasisTypeItalic ">δ} powders with Er content that was pretty small, especially the Ca_0.70Er_0.30MnO_{3−m class="EmphasisTypeItalic ">δ} powders, can be successfully synthesized through the hydrothermal technique. The SEM pictures showed that the Ca_{1−m class="EmphasisTypeItalic ">x}Er_xMnO_{3−m class="EmphasisTypeItalic ">δ} powders changed from acicular structure to the lamellar structure with increase in Er content, and the resistivity of the Ca_{1−m class="EmphasisTypeItalic ">x}Er_xMnO_{3−m class="EmphasisTypeItalic ">δ} powders with acicular structure was much lower than that of lamellar structure, which proved that the microstructure is the internal factor for improving the electrical properties.