Effect of Pr3+ substitution on the microstructure, specific surface area, magnetic properties and specific heating rate of Ni0.5Zn0.5PrxFe2-xO4 nanoparticles synthesized via sol-gel method

JOURNAL OF ALLOYS AND COMPOUNDS

卷:639

Article

Yan, Bing¹  Gao, Peng-zhao¹  Lu, Zhou-li¹  Ma, Rui-xue¹  Rebrov, Evgeny V.^2,3  Zheng, Hang-bo¹  Gao, Ying-xia¹ 

[1] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China

[2] Univ Warwick, Sch Engn, Coventry CV4 7AL, W Midlands, England

[3] Queens Univ Belfast, Sch Chem & Chem Engn, Belfast BT9 5AG, Antrim, North Ireland

关键词: Sol-gel method;    Pr3+ substitution Ni-Zn ferrite;    Magnetic properties;    Radio frequency heating;   

DOI  :  10.1016/j.jallcom.2015.03.211

来源: Elsevier

【 摘 要 】

A series of Ni-Zn ferrite nanoparticles with a nominal composition of Ni(0.5)Zn(0.5)PrxFe(2 x)O(4) (x = 0.000-0.100 with steps of 0.025) has been synthesized by a sol-gel method. The effect of composition and calcination temperature on the morphology, specific surface area, magnetic properties and specific heating rate has been studied. The Ni-Zn-Pr ferrites have a single spinel (NZF) phase at Pr loadings below 5 at%. A minor amount of an orthorhombic PrFeO3 phase is present in the Ni-Zn-Pr ferrites at Pr loadings above 5 at%. At a Pr loading of 10 at%, the specific surface area increases six-fold as compared to that of the non-doped Ni0.5Zn0.5Fe2O4 sample. As the Pr loading increases, the saturation magnetization, remnant magnetization and coercivity increase and reach the maximum at x = 0.05 and then decrease. The maximum values of these parameters are 67.0 emu/g, 9.7 emu/g and 87.2 Oe, respectively. Under radiofrequency field (frequency: 295 kHz, intensity: 500 Oe), the highest heating rate of 1.65 K/s was observed over the sample with x = 0.025 which is 2.5 times higher than that of Ni0.5Zn0.5Fe2O4. (C) 2015 Elsevier B.V. All rights reserved.

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