摘要
La2Mo2O9具有极低的热导率,但其在580℃左右会发生α-β相变,严重影响其性能和应用。本实验以Gd203掺杂La2Mo2O9制备了一系列La2-xGdxMo2O9 (x=0.0~0.5)固溶体,研究了掺杂Gd3+对La2Mo2O9相稳定性和热导率的影响。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+掺杂量的增加先减小后增加,室温下在x=0.2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)。
La2Mo2O9 is expected to have an extremely low thermal conductivity.However,the α-β phase transition at 580℃ seriously affects its performance and applications.In this work,a series of La2-xGdxMo2O9(x=0.0~0.5) solid solution was prepared by doping La2Mo2O9 with Gd2O3,and 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,reaching a minimum value at x=0.2 at room temperature.The thermal conductivities of all samples are below 1 W/(m·K).
作者
孙远
瞿志学
冯航航
刘钊岑
Sun Yuan;Qu Zhixue;Feng Hanghang;Liu Zhaocen(College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2020年第2期545-549,共5页
Rare Metal Materials and Engineering
基金
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)。
