Synthesis and magnetic properties of LiFe5O8 powders by a sol-gel process

被引：54

作者：

An, SY ^{[1
]}

Shim, IB ^{[1
]}

Kim, CS ^{[1
]}

机构：

[1] Kookmin Univ, Dept Phys, Seoul 136702, South Korea

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2005年 / 290卷

关键词：

lithium iron oxide; sol-gel method; Mossbauer spectroscopv;

D O I：

10.1016/j.jmmm.2004.11.244

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

LiFe5O8 ferrite has been prepared by a sol-gel method. The crystal structure was found to be cubic spinel structure with a lattice constant a = 0.8336 nin. LiFe5O8 powders that were annealed at and above 1173 K have a single-phase spinel structure. However, powders annealed at 973 and 1073 K have a typical spinel structure with small amount of hematite (alpha-Fe2O3) phase. The Neel temperature of LiFe5O8 was T-N = 905 +/- 3 K. The isomer shift values at room temperature for the A and B patterns are found to be 0.18 and 0.21 mm/s relative to the Fe metal, respectively, which are consistent with high-spin Fe3+ charge states. The saturation magnetization MS was 64.4 emu/g at room temperature under the applied magnetic field of 10 kOe after annealing at 1273 K in air atmosphere for 6 h. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：1551 / 1554

页数：4