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Citation: QI Shu-Yan, FENG Jing, HOU Xiang-Yu, ZHANG Mi-Lin. Effect of K⁺ Doping on Structure and Magnetic properties of Perovskite La_0.7Sr_0.3-xK_xMnO₃(0.05≤x≤0.3)[J]. Chinese Journal of Applied Chemistry, ;2008, 25(7): 825-828. shu

Effect of K⁺ Doping on Structure and Magnetic properties of Perovskite La_0.7Sr_0.3-xK_xMnO₃(0.05≤x≤0.3)

1.
Material Science and Chemistry Engineering Department, Harbin Engineering University, Harbin 150001

Corresponding author: FENG Jing,
Received Date: 14 July 2007
Available Online: 10 January 2008
Fund Project: 黑龙江省自然科学基金(B2007-08) (B2007-08)哈尔滨工程大学基础研究基金项目(HEUFT05019) (HEUFT05019)教育部博士点新教师基金(20070217060) (20070217060)

La_0.7Sr_0.3-xK_xMnO₃(0.05≤x≤0.3) powders were prepared by sol-gel technique.The samples were characterized by X-ray diffraction,SEM and VSM.A structure transition of La_0.7Sr_0.3-xK_xMnO₃ with x increasing from tetrahedron to monoclinic was observed.The morphology of La_0.7Sr_0.3-xK_xMnO₃ is inhomo-geneous ball with diameters of 100~500 nm.The Curie temperature and magnetization of La_0.7Sr_0.3-xK_xMnO₃ decrease with x increasing.When x=0.2,T_c (309 K) is near room temperature.This is the result of the Mn⁴⁺/Mn³⁺ ratio increasing,average ionic radii increasing and ionic mismatch enhancement.La_0.7Sr_0.1K_0.2-MnO₃ shows a larger magnetic entropy of ΔS_M=3.28 J/(Kg·K) near T_c due to strong magnetism and crystal lattice coupling effect in doped perovskite oxides.
- perovskite,
- double exchange,
- curie temperature,
- maximal magnetic entropy
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Effect of K+ Doping on Structure and Magnetic properties of Perovskite La0.7Sr0.3-xKxMnO3(0.05≤x≤0.3)

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通讯作者: 陈斌, bchen63@163.com

Effect of K⁺ Doping on Structure and Magnetic properties of Perovskite La_0.7Sr_0.3-xK_xMnO₃(0.05≤x≤0.3)