Post-Graduate Department of Chemistry, Khallikote College, Berhampur-760 001 Manuscript received 1 June 1988, revised 20 March 1989, accepted 21 December 1989 Manganese hydroxyapatite, MnHA and its solid solutions with calcium hydroxy­apatite CaHA, have been synthesised. The effect of substitution of manganese in CaHA is studied by X-ray, ir and magnetochemical studies. The formation of homo­geneous solid solutions of CaHA and MnHA is indicated from the measurement of lattice constants. In the

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... r spectra, the internal modes of the PO4 ion are shifted to lower frequencies consequent upon increase in cation mass and cation-anion bond strength. MnHA and its solid solutions with CaHA are found to be paramagnetic