烧绿石铱氧化物Bi_(1.8)Dy_(0.2)Ir_(2)O_(7)的结构和电输运性质研究  

Research on the structure and electrical transport properties of pyrochlore iridum oxides Bi_(1.8)Dy_(0.2)Ir_(2)O_(7)

作　　者：丰远 黄悦洋 刘慧[1] 边健[1] 李明 王志佳 FENG Yuan;HUANG Yue-yang;LIU Hui;BIAN Jian;LI Ming;WANG Zhi-jia(Hefei University,Hefei 230601 China)

机构地区：[1]合肥学院先进制造工程学院,安徽合肥230601 [2]合肥学院能源材料与化工学院,安徽合肥230601

出　　处：《新余学院学报》2021年第4期1-5,共5页Journal of Xinyu University

基　　金：国家自然科学基金项目“强磁场下化学计量失配对烧绿石型铱化合物中基态磁电性质的调控”(11604071);安徽省高校自然科学研究项目“键交替对几何阻挫材料LiMCr4O8中基态磁性的调控作用研究”(KJ2020A0655);合肥学院教学研究项目“基于CUPT模式的大学物理创新性实验教学研究”(2020hfujyxm36);国家级大学生创新创业训练计划项目“呼吸烧绿石陶瓷材料LiInCr4-xMxO8中自旋玻璃态研究”(202111059039)。

摘　　要：利用固相反应法制备烧绿石铱氧化物Bi2-x Dy xIr 2O 7(x=0,0.2)多晶样品。通过Rietveld结构精修、拉曼光谱实验、电阻率-温度曲线测量,研究了掺杂样品的结构和电输运性质。结果表明:样品为立方晶系,空间群为Fd-3m;掺杂样品在拉曼光谱上出现了四个明显的特征峰,它们主要对应IrO 6八面体内氧原子的伸缩和旋转振动模式。掺杂使得晶格常数减小,相对原子质量变小,导致拉曼峰位表现出移动现象。电阻率拟合揭示了晶界效应在电传导过程中起主导作用。In this paper,solid phase reaction was used to prepare polycrystalline samples of pyrochlore iridum oxides Bi2-x Dy xIr 2O 7(x=0,0.2).Through Rietveld refinement,experimental Raman spectroscopy,resistivity-temperature curve measurement,this paper studied the structure and electrical transport properties of doped samples.The results show that the sample is a cubic crystal system and the space group is Fd-3m;the doped sample has four obvious characteristic peaks in the Raman spectroscopy,which mainly correspond to the stretching and rotational vibration modes of oxygen atoms in the IrO 6 octahedron.Doping reduces the lattice constant and the relative atomic mass,which causes the Raman peak position to show a shift phenomenon.Fitting of resistivity reveals that the grain boundary effect plays a leading role in the electrical conduction process.

关 键 词：烧绿石铱氧化物 拉曼光谱 电输运性质 

分 类 号：O614.825[理学—无机化学]