物理化学学报2018，Vol.34Issue(4)：437-444,8.DOI:10.3866/PKU.WHXB201709043
点缺陷引起中子辐照MgO(110)单晶的铁磁性
Point Defects Induced Ferromagnetism in Neutron Irradiated MgO(110) Single Crystals
摘要
Abstract
The MgO(110) single crystals were neutron-irradiated with different doses ranging from 1.0×1016 to 1.0×1020 cm-2.The isointensity profiles of the X-ray diffuse scattering caused by the cubic and double-force point defects in MgO were calculated on the basis of the Huang scattering theory.The X-ray diffuse scattering and the UV-Vis absorption spectra were recorded to investigate the point defect configurations in the MgO(110) crystals.Furthermore,the magnetic properties were characterized by a superconducting quantum interference device magnetometer.The ω-2θ curves and rocking curves implied that neutron irradiation enhanced the lattice distortion.The point defects were produced in irradiated MgO crystals.The measured reciprocal space mappings (RSMs) revealed that the notable diffuse scattering was presented in irradiated MgO.Compared with the calculated diffuse scattering intensity profile,it was evident that Frenkel defects were introduced in the irradiated samples.The UV-Vis spectra indicated that anion O vacancy defects had been introduced in irradiated MgO.The single vacancies could be aggregated in irradiated samples with higher doses (1.0× 1019 and 1.0×1020 cm-2).Although the irradiated MgO(110) single crystals were diamagnetic at room temperature,they became ferromagnetic at low temperature.The maximum saturation magnetization was found to be 0.058 emu·g-1.By means of neutron irradiation,defect-mediated ferromagnetism could be achieved at low temperature.The correlation between ferromagnetism and O vacancies in neutron-irradiated MgO could be described using F-center exchange mechanism.关键词
MgO单晶/中子辐照/点缺陷/d0铁磁性/RSM/色心Key words
MgO single crystal/Neutron irradiation/Point defect/do ferromagnetism/RSM/Color center分类
化学化工引用本文复制引用
曹梦雄,王兴宇,马亚茹,马春林,周卫平,王晓雄,王海欧,谭伟石..点缺陷引起中子辐照MgO(110)单晶的铁磁性[J].物理化学学报,2018,34(4):437-444,8.基金项目
The project was supported by the National Natural Science Foundation of China (U1332106,11604147,11604067) and Scientific Research Innovation Projects of Jiangsu Province for University Graduate Students,China (CXLX13_179).国家自然科学基金(U1332106,11604147,11604067)和江苏省普通高校研究生科研创新项目(CXLX13_179)资助 （U1332106,11604147,11604067）
