图书来源:二元合金相图及中间相晶体结构 二元合金相图及中间相晶体结构
作 者:唐仁政 田荣璋
出版时间:2009-05
定 价:320元
图书ISBN:978-7-81105-831-4
出版单位:中南大学出版社
Li’an HAN Huaping YANG Yongjun HE Department of Basic Courses,Xi’an University of Science and Technology,Xi’an 710054,China
摘 要:<正>Lattice effect on magnetic and electrical transport properties of Ln2/3Pb1/3MnO3(Ln=La,Pr,Nd)films prepared by RF magnetron sputtering technique were investigated.With the decrease of the average ions radius <rA>,the structure of Ln2/3Pb1/3MnO3(Ln=La,Pr,Nd)targets transit from the rhombohedral phase to the orthorhombic phase,and the Curie temperature reduces rapidly with the decrease of <rA>.The electrical properties show that films are the metallic state which can be fitted to the formula:ρ(T)=ρ0+ρ1T2+ρ2T4.5 at low temperatures.The temperature range of the ferromagnetic metallic state becomes narrow with the decrease of<rA>.The phenomenon can be explained by the lattice effect.
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