Magnetic, transport and microstructural properties of polycrystalline samples with nominal composition of La0.7Ca0.3Mn1-xVxO3 (0 <= x <= 0.2)

作者：Zhao, T S^*; Li, B H; Han, G

来源：Journal of Magnetism and Magnetic Materials, 2008, 320(6): 924-929.

DOI：10.1016/j.jmmm.2007.09.016

• colossal magnetoresistance
• magnetic material
• manganite
• ceramic composite
• magnetization

Polycrystalline samples with nominal composition of La0.7Ca0.3Mn1-xVxO3 (0 <= x <= 0.2) sintered in air were investigated by ac susceptibility, dc magnetization, magnetoresistance (MR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and differential thermal analysis (DTA) measurements. It is found that V could not substitute for Mn to form La0.7Ca0.3Mn1-xVxO3 phase when the samples are sintered in air. The obtained samples contain several phases such as (La, Ca) Mn1-delta O3, LaCa3V3O12, Mn3O4 phases, etc. and constitute multi-phase composites. The Curie temperature T-C and spontaneous magnetization of the composites decrease, and the resistance of the composites increases as the V content increases. The addition of V may effectively improve the low. field MR response at low temperatures due to the variation in the microstructure of the composites.

• 出版日期2008-3
• 单位中国人民大学; 北京科技大学; 北京工商大学