Structural, magnetic and thermal properties of one-dimensional CoFe2O4 microtubes

JOURNAL OF ALLOYS AND COMPOUNDS

卷:665

Article

Lu, Zhou-li¹  Gao, Peng-zhao^1,2  Ma, Rui-xue¹  Xu, Jia¹  Wang, Zheng-he¹  Rebrov, Evgeny V.³ 

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

[2] Hunan Univ, Hunan Prov Key Lab Spray Deposit Technol & Applic, Changsha 410082, Hunan, Peoples R China

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

关键词: Cobalt ferrite;    Microtubes;    Magnetic properties;    Thermal capacity;    Radiofrequency heating;   

DOI  :  10.1016/j.jallcom.2015.12.262

来源: Elsevier

【 摘 要 】

One-dimensional CoFe2O4 microtubes have been prepared via a simple template-assembled sol-gel method. Influence of calcination temperature on structural and magnetic properties, heat capacity and specific heating rate under radiofrequency field 295 kHz was studied. A CoFe2O4 spinel was the main phase in all samples. As the calcination temperature increased, the average crystal size increased from 34.1 to 168 nm and the specific surface area decreased from 85.7 to 8.5 m(2) g(-1). When calcined at 1073 K, porous microtubes with a narrow size distribution in the range between 2.0 and 2.5 mm and a length to diameter ratio exceeding 20 were obtained. The heat capacity of the microtubes calcined at 973 K was 140.81 J mol(-1) K-1 at 395 K, being close to the theoretic value. The sample calcined at 973 K showed highest rate of 0.293 K s(-1) mg(-1). (C) 2016 Elsevier B.V. All rights reserved.

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