Mössbauer effect studies of the GaCoMnO₄−ZnFeMnO₄ system

Abstract

Mössbauer studies have been carried out on the spinel system GaCoMnO₄−ZnFeMnO₄ at room temperature (294K) for the values ofX=0, 20, 40, 50, 60, 80 and 100 (whereX denotes the mole percent of ZnFeMnO₄ in GaCoMnO₄). All the compounds showed well resolved quadrupole split doublets. Isomer shift values varied between 0·26 and 0·48 mm/sec. The value of quadrupole splitting increased with increasingu parameter. The increase inu parameter is attributed to the replacement of Ga³⁺ by Zn²⁺ ions at the A-site. From Mössbauer studies, the ionic configuration of the system is suggested as

$$Ga_{1 - x}^{3 + } Zn_x^{2 + } [Co_{1 - x}^{2 + } Fe_x^{3 + } Mn^{3 + } ]O_4^{2 - } $$