摘要
采用水热合成方法,通过调控反应物中Ca2+与La3+的摩尔比可控合成了钙钛矿结构La1-x-yCaxKyMnO3(0.05≤x≤0.49;0.05≤y≤0.21)系列样品,利用X射线衍射仪、扫描电子显微镜、等离子光谱仪及磁性测量系统对样品的结构、形貌、成分组成和磁学性质进行了研究.结果表明,该水热反应过程为歧化反应,K+离子的引入导致了样品中双铁磁相的出现.
Abstract Perovskite La1-x-yCaxKyMnO3(0.05≤x≤0.49;0.05≤y≤0.21) crystals have been hydrotherma- lly synthesized through controlling the molar ratio of Ca^2+ to La^3+ of the reactant solution. The structures, mor- phologies, compositions and magnetic properties of the crystals were studied by X-ray diffractometer ( XRD), inductively coupled plasma(ICP) analyzer, scanning electron microscope(SEM) and vibrating sample magne- tometer(VSM ), respectively. The results show that the crystals were prepared from the disproportionation reaction. Two ferromagnetic phases could also be observed, which could be attributed to the doping of K+ ions.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2013年第1期40-44,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:90922034,21131002)
高等学校博士学科点专项科研基金(批准号:20110061130005)资助
关键词
水热合成
歧化反应
三重价态
双铁磁相
Hydrothermal synthesis
Disproportionation reaction
Three oxide states
Two ferromagnetic pha- ses