孙远,瞿志学,冯航航,刘钊岑.Gd3+掺杂La2Mo2O9的相稳定性及热导率研究[J].稀有金属材料与工程,2020,49(2):545~549.[Sun Yuan,Qu Zhixue,Feng Hanghang,Liu Zhaocen.Phase stability and thermal conductivity of Gd3+ doped La2Mo2O9[J].Rare Metal Materials and Engineering,2020,49(2):545~549.]
Gd3+掺杂La2Mo2O9的相稳定性及热导率研究
投稿时间:2019-03-15  修订日期:2019-04-23
中文关键词:  La2-xGdxMo2O9  相稳定性  热导率
基金项目:北京市自然科学基金(2182007);北京市属高校高水平教师队伍建设支持计划青年拔尖人才培育计划(CIT&TCD201704031)
中文摘要:
      La2Mo2O9具有极低的热导率,但其在580 ℃左右会发生ɑ-β相变,严重影响其性能和应用。本文以Gd2O3掺杂 La2Mo2O9制备了一系列La2-xGdxMo2O9(x = 0 ~ 0.5)固溶体,研究了掺杂Gd3+对La2Mo2O9相稳定情况和热导率的影响。结果表明,随着Gd3+掺杂量的增加,相变得到有效抑制,当x ≥ 0.2时样品以β相存在。样品的热导率随Gd3+掺杂量的增加先降低后增加,常温下在x = 0.2左右时达到最低,此后缓慢上升,但所有样品的热导率均小于1 W/(m.K)。
Phase stability and thermal conductivity of Gd3+ doped La2Mo2O9
英文关键词:La2-xGdxMo2O9  Phase transition  Thermal conductivity
英文摘要:
      La2Mo2O9 is expected to have an extremely low thermal conductivity. However, the α-β phase transition at 580 oC seriously affects its performance and applications. In this work, the effect of Gd3+ doping on the phase stability and thermal conductivity was investigated. The results show that the phase transition of La2Mo2O9 is effectively suppressed with the doping of Gd3+ ions. The samples show a β-phase when x ≥ 0.2. Moreover, the thermal conductivity decreases firstly and then increases with the increase of doping content of Gd3+ ions with a minimum value at x = 0.2 at room temperature. The thermal conductivities of all samples are below 1 W/(m.K).
作者单位E-mail
孙远 北京工业大学 材料科学与工程学院 2645009228@qq.com 
瞿志学 北京工业大学 材料科学与工程学院 quzhixue@bjut.edu.cn 
冯航航 北京工业大学 材料科学与工程学院  
刘钊岑 北京工业大学 材料科学与工程学院  
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