Magnetic Properties and Crystal Structure of DyMn2O5 Nanoparticles Embedded in Mesoporous Silica
Magnetic Properties and Crystal Structure of DyMn2O5 Nanoparticles Embedded in Mesoporous Silica
复制标题
DOI：
10.1016/j.phpro.2015.12.117
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Tajiri;Y. Ando;H. Deguchi;M. Mito;A. Kohno
中科院分区：
文献类型：
--
作者：
T. Tajiri;Y. Ando;H. Deguchi;M. Mito;A. Kohno
以介孔二氧化硅为模板，合成了纳米尺寸的dymn2o5纳米颗粒。通过晶体结构分析和磁性测量研究了dymn2o5纳米颗粒的尺寸效应。粉末x射线衍射测试表明，合成的纳米颗粒具有正交结构，粒径约为7 nm。纳米粒子的晶格常数与本体晶体的晶格常数有所偏离。dymn2o5纳米颗粒表现出超顺磁性。纳米颗粒的魏氏温度为正值，而体晶的魏氏温度为负值。实验结果表明，纳米颗粒中晶体结构的畸变引起了锰自旋之间的磁交换相互作用和磁受挫的变化。
We synthesized DyMn2O5nanoparticles with the nanometer size using mesoporous silica as template of nanoparticles. The size effects of the DyMn2O5nanoparticles were investigated through crystal structure analysis and magnetic measurement. The powder X-ray diffraction measurement revealed that the synthesized nanoparticles have orthorhombic structure with particle size of approximately 7 nm. The lattice constants for the nanoparticles deviated from those for the bulk crystal. The DyMn2O5nanoparticles exhibited superparamagnetic behaviors. The evaluated Weiss temperature for the nanoparticles was positive value, whereas that for bulk crystal was negative one. The experimental results suggested that the distortion of crystallographic structure in the nanoparticles induced the changes in magnetic exchange interactions and magnetic frustration among manganese spins.