[1] Misra S K and Sun J 1990 Physica B 162 331

[2] Vishwanath A K and Radhakrishna S 1991 J. Phys. Chem.
Solids 52 227

[3] Raju B D P, Narsimhulu K V, Gopal N O and Rao J L 2003
J. Phys. Chem. Solids 64 1339

[4] Tapramaz R, Karabulut B and Koksal F 2000 J. Phys.
Chem. Solids 61 1367

[5] Gopal N O, Narsimhulu K V and Rao J L 2001 Physica B
307 117

[6] Kripal R, Maurya M.and Govind H 2007 Physica B
392 281

[7] Kripal R and Mishra I 2009 Spectrochim. Acta A
72 538

[8] Osterberg R 1974 Coord. Chem. Rev. 12 309

[9] Fee J A 1975 Struct. Bond. 23 1

[10] Jezoska-Trzebiatowska B 1974 Pure Appl. Chem.
38 367

[11] Low B W, Hirshfeld F L and Richards F M 1959 J. Am.
Chem. Soc. 81 4412

[12] Abragam A and Bleaney B 1970 Electron Paramagnetic
Resonance of Transition Ions (Oxford: Clarendon)

[13] Bansal R S, Seth V P and Chand P 1989 J. Phys. Chem.
Solids 50 839

[14] Schonland D S 1959 Proc. Phys. Soc. 73 788

[15] Rao J L, Murali R and Lakshman S V J 1988 Solid
State Commun. 67 531

[16] Kripal R and Singh P 2007 Solid State Commun.
142 412

[17] Radhakrishna S and Salagram M 1980 Phys. Status
Solidi A 62 441

[18] Yen T F 1969 Electron Spin Resonance of Metal
Complexes (New York: Plenum)

Sathyanarayan S G, Krishnan V G and Sastry G S 1976 J.
Chem. Phys. 65 418

[19] McGarvey B R 1967 J. Phys. Chem. 71 51

[20] Maki A H and Mc Garvey B R 1958 J. Chem. Phys.
29 35

[21] Satyanarayana N and Radhakrishna S 1985 J. Chem.
Phys. 83 529

[22] Kivelson D and Lee S K 1964 J. Chem. Phys. 41
1896

[23] Ortolano D R, Selvinandand J and Mc Glynn S P 1964
J. Chem. Phys. 41 262

[24] Ballhausen C J and Gray H B 1962 Inorg. Chem.
1 111

[25] Seth V P, Jain V K, Yadav A and Bansal R S 1985
Phys. Status Solidi B 132 K139

[26] Jain V K 1979 J. Phys. Soc. Jpn. 46 1250

[27] Sato T, Nakamura K and Ikoma S 1979 J. Inorg. Nucl.
Chem. 41 223