Effect of Nb5+and Cu2+codoping on thermal properties of Gd2Zr2O7 ceramic

• 作者: Tao Jiang Min Xie Lili Guan Xuanli Wang Xiwen Song
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: ADVANCED RARE EARTH MATERIALS
• 页码范围: 180-185
• 页数: 6页
• 语种: 英文

摘要

In this work,Nb5+and Cu2+were selected to partially substitute Zr4+in Gd2Zr2O7 for studying the phase structure,microscopic morphology and thermal properties.Gd2(Zr1-3x/2NbxCux/2)2O7(x = 0,0.05,0.1,0.15,0.2,0.25)ceramic materials were synthesized by high-temperature solid-state reaction method.The results show that the Gd2(Zr1-3x/2NbxCux/2)2O7 ceramics present cubic pyrochlore structure with clear grain boundaries and dense cell structure.And the thermal expansion coefficient of Gd2(Zr1-3x/2NbxCux/2)2O7 ceramics gradually decreases because of the incorporation of Nb5+and Cu2+into Zr-site in Gd2Zr2O7.Meanwhile,its thermal conductivity decreases firstly and then increases with the doping of Nb5+and Cu2+,which reaches the lowest value for the composition of Gd2(Zr0.85Nb0.1Cu0.05)2O7.