[1] Fu Y P, Lin C H, Liu C W and Yao Y D 2005 J. Alloy.
Compd. 395 247

[2] Nutan G, Mukesh C D, Subhash C K and Dube D C 2005
Ceram. Inter. 31 171

[3] Widatallah H M, Johnson C, Berry F J, Gismelseed A M,
Jartych E, Marco J F, Gard F S and Pekala M 2006 J. Phys. Chem.
Solid. 67 1817

[4] Roy P K and Bera J 2006 J. Magn. Magn. Mater.
298 38

[5] Teo M L S, Kong L B, Li Z W, Lin G Q and Gan Y B 2008
J. Alloy. Comp. 459 557

[6] Watawe S C, Bamne U A, Gonbare S P and Tangsali R B 2007
Mater. Chem. Phys. 103 323

[7] Cai X B, Zhou X M and Hu G K 2006 Chin. Phys. Lett.
23 348

[8] Zhang H W, Shi Y and Zhong Z Y 2002 Chin. Phys.
Lett. 19 269

[9] Wang S F, Wang Y R, Yang T C K, Wang P J and Lu C A 2000
J. Magn. Magn. Mater. 217 35

[10] Murbe J and Topfer J 2006 J. Electroceram 16
199

[11] Su H, Zhang H W and Tang X L 2005 Mater. Sci. Eng.
B 117 231