Effect of High Resistance Phases on Metal-Insulator Transition of La 0.67 Ca 0.33 MnO 3

Autor:	Liu Li, Zhang Li-Jiang, Tang Jie, Zhang Guo-Hong, Tang Chao-Qun, Xia Zheng-Cai, Liu Sheng, Feng Wen, Yuan Song-Liu
Rok vydání:	2003
Předmět:	Materials science Electrical resistivity and conductivity Doping Composite number Analytical chemistry General Physics and Astronomy Grain boundary Metal–insulator transition Atmospheric temperature range Yttria-stabilized zirconia Ion
Zdroj:	Chinese Physics Letters. 20:1116-1119
ISSN:	1741-3540 0256-307X
DOI:	10.1088/0256-307x/20/7/342
Popis:	The temperature dependence of resistivity ρ of YSZ doping composite of (1-x)La0.67Ca0.33MnO3 + xYSZ and Y2O3 doping composite of (1-y)La0.67Ca0.33MnO3 + yY2O3 is investigated, respectively, in a temperature range 77-300 K, where the YSZ represents yttria-stabilized zirconia (8 mol%Y2O3+92 mol% ZrO2). Experimental results show that the YSZ doping level has important effects on both the metal-insulator (M-I) transition temperatures and zero field resistivity of the composites of (1-x)La0.67Ca0.33MnO3 + xYSZ. However, the Y2O3 doping level has little effect on the M-I transition temperatures and the zero field resistivity of (1-y)La0.67Ca0.33MnO3 + yY2O3 only increases slightly. The difference between the two types of composites may mainly result from the different distribution of high resistance phases at the grain boundaries and/or surfaces of La0.67Ca0.33MnO3 grains rather than the substitution of La3+ ions with Y3+ ions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a1e1fd018b8a863fb83a469fcb872e40 https://doi.org/10.1088/0256-307x/20/7/342 Zobrazit plný text záznamu