物理学报2011，Vol.60Issue(7)：710-715,6.
钪钇石型β-Mn2V2O7的水热合成、结构表征与反铁磁性
Hydrothermal synthesis, structure characterization and antiferromagnetic properties of thortveitite-type β-Mn2 V2 O7
周传仓 1刘发民 1丁苋 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
β-Mn2V2OTpowder is successefully prepared at 200--220℃ under pH = 6-9 by a novel hydrothermal synthesis technology. The phase, the morphology and the microstructure of the prepared sample are investigated by XRD, SEM, EDS, TEM, HRTEM and SAED. The results show that 13-Mn2V2O7powder has a thortveitite structure with monoclinic system. The powder synthesized at 200 ℃ under pH = 6-7 has a rod morphology, while that at 200 ℃ under pH = 8-9 has coexistent petal and rod morphologies. HRTEM and SAED measurements indicate that 13-Mn2V2O7 grows anisotropically and has crystalline integrality. Magnetic properties are measured by superconducting quantum interference device （SQUID） in a temperature range of 2-300 K under a magnetic field of IT. The magnetic measurement results indicate that 13-Mn2V2O7undergoes a transition from antiferromagnetic to paramagnetic with a N6el temperature of 24 K. Above 100K, the inverse susceptibility is fitted well to the Curie-Weiss law and paramagnetic Weiss temperature 0 = - 24.6 K, and the Curie constant C = 9. 846 K emu mol-f, u.^-1can be caculated, which means that there exists an obvious antiferromagnetic interaction in thortveitite-type 13 - Mn2V2O7, the antiferromagnetic behavior is caused by the superchange of Mn2＋ - 02- - Mn2＋ .关键词
水热法/β-Mn2V2O7/结构与形貌/反铁磁性Key words
hydrothermal method/β-Mn2V2O2/structure and morphology/antiferromagnetic properties分类
数理科学引用本文复制引用
周传仓,刘发民,丁苋,钟文武,蔡鲁刚,曾乐贵..钪钇石型β-Mn2V2O7的水热合成、结构表征与反铁磁性[J].物理学报,2011,60(7):710-715,6.
