首页 / 资料库 / 文献详情

Magnetoresistive properties of Ni-doped La0.7Sr0.3MnO3 manganites

Ahmed、Mohamed Bakr Mohamed、El-Moez、Medhat、Abdelrady、Abdellateef、Hassan M.A. Hassan、El-Ghanny

2016稀有金属：英文版Materials Science被引 14

摘要

La0.7Sr0.3Mn1-xNixO3（x = 0, 0.025, 0.050 and 0.075） ceramics were prepared by the conventional solid-state reaction method. The partial substitution of Mn by Ni2+ leads to a decrease in cell volume as well as a structural transition from the rhombohedral to the orthorhombic structure. Ni2+ doping increases the electrical resistivity, decreases the semiconductor–metal transition temperature（Tms） and relatively enhances the room temperature magnetoresistance（MR）, especially in x = 0.025 and around Tms. With respect to conduction mechanism, the small polaron hopping（SPH） and the variable range hopping（VRH） models were used to examine conduction in the semiconducting region.

引用本文（GB/T 7714）