[1]李玉成,晁明舉 *,張牛,等.負熱膨脹材料Sm0.85Sr0.15MnO3-δ制備及熱膨脹性能研究[J].中國材料進展,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]
點擊復制
負熱膨脹材料Sm0.85Sr0.15MnO3-δ制備及熱膨脹性能研究(
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中國材料進展[ISSN:1674-3962/CN:61-1473/TG]
- 卷:
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- 期數:
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2015年第7-8期
- 頁碼:
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031-35
- 欄目:
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特約研究論文
- 出版日期:
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2015-08-18
文章信息/Info
- Title:
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A novel negative thermal expansion material Sm0.85Sr0.15MnO3-δ: synthesis and thermal property
- 作者:
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李玉成; 晁明舉 *; 張牛; 梁二軍
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鄭州大學 物理工程學院 材料物理教育部重點實驗室
- Author(s):
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LI Yucheng; CHAO* Mingju; ZHANG Niu; LIANG Erjun
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Key Laboratory of Materials Physics of Ministry of Education of China, School of Physical Science and Engineering, Zhengzhou University
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- 關鍵詞:
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負熱膨脹' target="_blank" rel="external"> FONT-FAMILY: 宋體">負熱膨脹; FONT-FAMILY: "; Calibri"; "; sans-serif"; ">Sm0.85Sr0.15MnO3- δ' target="_blank" rel="external"> FONT-FAMILY: 宋體">δ; 晶格畸變' target="_blank" rel="external"> FONT-FAMILY: 宋體">晶格畸變; FONT-FAMILY: "; Calibri"; "; sans-serif"; ">Jahn-Teller效應' target="_blank" rel="external"> FONT-FAMILY: 宋體">效應; 氧缺陷
- DOI:
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10.7502/j.issn.1674-3962.2015.07.03
- 文獻標志碼:
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A
- 摘要:
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制備新的性能良好的負熱膨脹材料具有重大的應用價值。本工作以 Sr2+ 部分替代 SmMnO3 中的 Sm3+ ，采用固相法成功制備出新的負膨脹材料 Sm0.85Sr0.15MnO3- δ。熱膨脹性能測試其線膨脹系數 -10.08 × 10-6 /K （ 360~873 K ）；電子掃描電鏡觀察其組織為單一的球狀或橢球狀顆粒；密度測量其相對密度 95.5% ； XRD 和 EDS 分析表明， Sm0.85Sr0.15MnO3- δ為正交結構（空間群 pnma ）； DSC 和 TGA 實驗支持了 Sm0.85Sr0.15MnO3- δ在溫度升高時 Mn4+O6 八面體畸變及氧缺陷的存在。分析認為， Sm0.85Sr0.15MnO3- δ的熱膨脹機制為晶格振動和 Mn 離子間電子轉移兩個因素共同作用：當溫度低于 360K 時，隨著溫度的升高，晶格振動加劇引起晶胞體積增大占優， Sm0.85Sr0.15MnO3- δ呈現低正膨脹性能；當溫度高于 360K 時，隨著溫度的升高， Mn4+ 轉化成 Mn3+ 的離子數增加，導致 Mn4+O6 八面體畸變增大甚至產生氧缺陷，使得晶格體積變小占優， Sm0.85Sr0.15MnO3- δ呈現負膨脹性能。
- Abstract:
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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