X-ray, IR and bulk magnetic properties of Cu1+xMnxFe2-2xO4 ferrite system

被引:35
作者
Birajdar, DS [1 ]
Devatwal, UN [1 ]
Jadhav, KM [1 ]
机构
[1] Marathwada Univ, Dept Phys, Aurangabad 431004, Maharashtra, India
关键词
D O I
10.1023/A:1014505620254
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The structural, IR and magnetic properties of the mixed spinel Cu1+xMnxFe2-2xO4 (x = 0.0, 0.1, 0.2, 0.3, 0.4, 0.5 and 0.6) system have been investigated by means of X-ray diffraction, Infrared spectroscopy, magnetization and a.c. susceptibility measurements. X-ray results confirm single-phase spinel structure for all the concentrations. The structure of CuFe2O4 is tetragonal and changes to cubic for x = 0.1 to 0.4. For x = 0.5 and 0.6 the structure become tetragonal. The lattice parameter and X-ray density are deduced and their variation with Mn4+ concentration is studied. The cation distribution derived from the X-ray diffractometry data was found to agree very well with the cation distribution obtained from magnetization measurements. X-ray intensity calculations indicate that Mn4+ occupy only octahedral [B] sites and Cu2+ and Fe3+ ions occupy both octahedral [B] and tetrahedral (A) sites. The infrared spectra obtained at room temperature in the range 200-800 cm(-1) showed two absorption bands. The force constants have been obtained from IR data. The variation of the saturation magnetization per formula unit as a function of Mn4+ content x has been satisfactorily explained on the basis of Neel's collinear spin ordering model for all values of x. The Curie temperature T-C determined from a.c. susceptibility data decreases with increase of Mn4+ concentration x, suggesting decrease in ferrimagnetic behaviour. (C) 2002 Kluwer Academic Publishers.
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页码:1443 / 1448
页数:6
相关论文
共 29 条
[1]  
Bellad SS, 1998, INDIAN J PURE AP PHY, V36, P598
[2]  
Belov K. P., 1983, Soviet Physics - Solid State, V25, P1609
[3]  
BHARATI S, 1980, INDIAN J PURE AP PHY, V18, P747
[4]  
BLASSE G, 1964, PHILIPS RES REP SUPP, V3
[5]  
BUERGER MJ, 1960, CRYSTAL STRUCTURE AN
[6]  
Cullity B.D., 1959, ELEMENTS XRAY DIFFRA
[7]   EQUILIBRIUM ORDER-DISORDER IN SPINELS [J].
DATTA, RK ;
ROY, R .
JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 1967, 50 (11) :578-&
[8]  
FURAHASHI H, 1973, J INORG NUCL CHEM, V35, P3003
[9]   THEORY OF IONIC ORDERING, CRYSTAL DISTORTION, AND MAGNETIC EXCHANGE DUE TO COVALENT FORCES IN SPINELS [J].
GOODENOUGH, JB ;
LOEB, AL .
PHYSICAL REVIEW, 1955, 98 (02) :391-408
[10]  
GORTER EW, 1954, PHILIPS RES REP, V9, P295