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Mössbauer spectroscopy; X-ray powder analysis; crystal structure; Fe-substitution

The effect of doping iron at the yttrium site in hexagonal KCaY(PO₄)₂ is studied for various concentrations ofx (0≤x≤1), of iron using Mössbauer and X-ray diffraction methods. For low iron concentrations, very little changes in structure are seen but atx≈0·1, onset of new peaks in the XRD pattern is observed. The Mössbauer study of the doped samples reveals that iron has a solubility of up to 2·5% in the parent phase with any excess iron precipitating out to form a new and unknown phase. From a detailed analysis of the X-ray diffraction pattern (corresponding tox=1) of the latter phase, it is found that this phase is rhombohedral with the possible space groupR3.

T N Sairam¹ G V Narasimha Rao¹ B Viswanathan¹

1. Materials Science Division, Indira Gandhi Centre for Atomic Research, Kalpakkam - 603 102, India

Published

June 1999

Manuscript received

18 December 1998