Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo hóa học: " Aqueous Solution Preparation, Structure, and Magnetic Properties of Nano-Granular ZnxFe32xO4 Ferrite Films"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Aqueous Solution Preparation, Structure, and Magnetic Properties of Nano-Granular ZnxFe32xO4 Ferrite Films | Nanoscale Res Lett 2010 5 1518-1523 DOI 10.1007 s11671-010-9672-4 NANO EXPRESS Aqueous Solution Preparation Structure and Magnetic Properties of Nano-Granular ZnxFe3_xO4 Ferrite Films Qiang Tian Qian Wang Qingshui Xie Jiangong Li Received 11 March 2010 Accepted 7 June 2010 Published online 22 June 2010 The Author s 2010. This article is published with open access at Springerlink.com Abstract This paper reports a simple and novel process for preparing nano-granular ZnxFe3_xO4 ferrite films 0 x 0.99 on Ag-coated glass substrates in DMAB-Fe NO3 3-Zn NO3 2 solutions. The deposition process may be applied in preparing other cations-doped spinel ferrite films. The Zn content x in the ZnxFe3_xO4 films depends linearly on the Zn2 ion concentration ranging from 0.0 to 1.0 mM in the aqueous solutions. With x increasing from 0 to 0.99 the lattice constant increases from 0.8399 to 0.8464 nm and the microstructure of the films changes from the non-uniform nano-granules to the fine and uniform nano-granules of 50-60 nm in size. The saturation magnetization of the films first increases from 75 emu g to the maximum 108 emu g with x increasing from 0 to 0.33 and then decreases monotonously to 5 emu g with x increasing from 0.33 to 0.99. Meanwhile the coercive force decreases monotonously from 116 to 13 Oe. Keywords Ferrite films Aqueous solution deposition Nano-granules Magnetic properties Introduction Spinel ferrites MexFe3_xO4 Me Mn Co Ni Zn Mg Cu etc. are a technologically important group of materials having numerous applications in magnetic devices Qiang Tian and Qian Wang contributed equally to this work. Q. Tian Q. Wang Q. Xie J. Li Institute of Materials Science and Engineering and MOE Key Laboratory for Magnetism and Magnetic Materials Lanzhou University 730000 Lanzhou China e-mail lijg@lzu.edu.cn recording materials photocatalysis ferrofluid technology magnetic refrigeration and humidity sensors 1 2 . The typical spinel ferrite Fe3O4 has 64 tetrahedral sites A sites and 32