[1]李玉成,晁明举 *,张牛,等.负热膨胀材料Sm0.85Sr0.15MnO3-δ制备及热膨胀性能研究[J].中国材料进展,2015,(7-8):031-35.[doi:10.7502/j.issn.1674-3962.2015.07.03]
 LI Yucheng,CHAO* Mingju,ZHANG Niu,et al.A novel negative thermal expansion material Sm0.85Sr0.15MnO3-δ: synthesis and thermal property[J].MATERIALS CHINA,2015,(7-8):031-35.[doi:10.7502/j.issn.1674-3962.2015.07.03]
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负热膨胀材料Sm0.85Sr0.15MnO3-δ制备及热膨胀性能研究()
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中国材料进展[ISSN:1674-3962/CN:61-1473/TG]

卷:
期数:
2015年第7-8期
页码:
031-35
栏目:
特约研究论文
出版日期:
2015-08-18

文章信息/Info

Title:
A novel negative thermal expansion material Sm0.85Sr0.15MnO3-δ: synthesis and thermal property
作者:
李玉成晁明举 *张牛梁二军
郑州大学 物理工程学院 材料物理教育部重点实验室
Author(s):
LI Yucheng CHAO* Mingju ZHANG Niu LIANG Erjun
Key Laboratory of Materials Physics of Ministry of Education of China, School of Physical Science and Engineering, Zhengzhou University
关键词:
负热膨胀' target="_blank" rel="external"> FONT-FAMILY: 宋体">负热膨胀 FONT-FAMILY: "Calibri""sans-serif"">Sm0.85Sr0.15MnO3- δ' target="_blank" rel="external"> FONT-FAMILY: 宋体">δ 晶格畸变' target="_blank" rel="external"> FONT-FAMILY: 宋体">晶格畸变 FONT-FAMILY: "Calibri""sans-serif"">Jahn-Teller效应' target="_blank" rel="external"> FONT-FAMILY: 宋体">效应氧缺陷
DOI:
10.7502/j.issn.1674-3962.2015.07.03
文献标志码:
A
摘要:
制备新的性能良好的负热膨胀材料具有重大的应用价值。本工作以 Sr2+ 部分替代 SmMnO3 中的 Sm3+ ,采用固相法成功制备出新的负膨胀材料 Sm0.85Sr0.15MnO3- δ。热膨胀性能测试其线膨胀系数 -10.08 × 10-6 /K 360~873 K );电子扫描电镜观察其组织为单一的球状或椭球状颗粒;密度测量其相对密度 95.5% XRD EDS 分析表明, Sm0.85Sr0.15MnO3- δ为正交结构(空间群 pnma ); DSC TGA 实验支持了 Sm0.85Sr0.15MnO3- δ在温度升高时 Mn4+O6 八面体畸变及氧缺陷的存在。分析认为, Sm0.85Sr0.15MnO3- δ的热膨胀机制为晶格振动和 Mn 离子间电子转移两个因素共同作用:当温度低于 360K 时,随着温度的升高,晶格振动加剧引起晶胞体积增大占优, Sm0.85Sr0.15MnO3- δ呈现低正膨胀性能;当温度高于 360K 时,随着温度的升高, Mn4+ 转化成 Mn3+ 的离子数增加,导致 Mn4+O6 八面体畸变增大甚至产生氧缺陷,使得晶格体积变小占优, Sm0.85Sr0.15MnO3- δ呈现负膨胀性能。
Abstract:
if we prepare new negative thermal expansion material properties which have Good performance ,they will have great value. A novel negative thermal expansion (NTE) material Sm0.85Sr0.15MnO3-δ was synthesized by solid-state method. It is originated in SmMnO3 with Sr2+ partly substituting Sm3+. Ceramic Sm0.85Sr0.15MnO3-δ exhibits NTE coefficient of -10.08×10-6/K from 360 to 873 K, which crystallized in orthorhombic structure (space group pbnm) with regular morphology and uniform grain size. The relative density measured by Archimedes drainage method is 95.5%. The results of X-ray diffraction and TGA-DSC suggest the negative phenomenon relates to the electron transfer of Mn ions. Mn4+ dramatically converted into Mn3+ accompanied by Mn4+O6 octahedral distortions and oxygen defects as temperature increasing. It is found that the sample volume continually decreases.
更新日期/Last Update: 2015-06-29