物理学报2011，Vol.60Issue(4)：721-730,10.
钶铁矿型MnNb2O6的熔盐法合成、钒掺杂与磁性研究
Molten salt synthesis, V-doped and magnetic properties of columbite MnNb2 O6
周传仓 1刘发民 1丁芃 1钟文武 1蔡鲁刚 1曾乐贵1
作者信息
- 1. 北京航空航天大学物理科学与核能工程学院,教育部微纳测控与物理重点实验室,北京,100191
- 折叠
摘要
Abstract
A novel molten salt synthsis technology is developed to prepare single phase and V-doped MnNb2O6 powder. The prepared samples are characterized by XRD, SEM, EDS, TEM, HRTEM and SAED. The results show that the MnNb2O6 powder has an orthorhombic structure and the samples prepared in different molten salts exhibit different shapes: flake shape, rod shape, and rectangular shape. The effects of temperature and doped on structure and morphology are discussed. HRTEM and SAED indicate the rod-shape MnNb2O6 has the properties of anisotropic growth and crystalline integrality. Magnetic properties are measured by superconducting quantum interference device (SQUID) in a temperature range of 2-30 K under a magnetic field of 2T. The magnetic measurement results indicate that MnNb1.8V0.2O6 undergoes an antiferromagnetic transition with a Néel temperature of 5.4 K. Above 20 K, the inverse susceptibility is fitted well to the Curie-Weiss law θ = -33.9 K,C = 10. 52 K emu mol·f. u. -1 and effective moment 5.82μB can be obtained. With V doped amount increases, antiferromagnetic interaction increases. According to the Anderson model, the MnNb2-xVxO6is antiferromagnet in a low temperature range, which is induced by the superexchange interaction of Mn2+ -O2- -Mn2+.关键词
熔盐法/结构与形貌/掺杂/反铁磁性Key words
molten salt synthesis/ columbite MnNb2O6/ structure and morphology/ antiferromagnetic properties引用本文复制引用
周传仓,刘发民,丁芃,钟文武,蔡鲁刚,曾乐贵..钶铁矿型MnNb2O6的熔盐法合成、钒掺杂与磁性研究[J].物理学报,2011,60(4):721-730,10.
