Vijayan, SVarma, H2017-03-102017-03-10200256 ,5;827-83110.1016/S0167-577X(02)00622-5https://dspace.sctimst.ac.in/handle/123456789/10065Gel cast sample of nanocrystalline hydroxy apatite powder has been sintered to high densities by short-time microwave processing and is characterised by X-ray diffractornetry (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SCM), density measurements and Vickers microhardness (Hv) measurements. The basic crystallite size of the precipitated HAP was found to be around 35 mn by XRD and TEM studies. The gel cast samples of the above powder could be sintered to above 95% by exposing to microwave radiation for a period of 5 min. The sintered grainsize of the sample was 200 300 mn having microhardness in the range of 5.25 GPa and the effect of microwave exposure time on the densification and grainsize is reported. (C) 2002 Elsevier Science B.V. All rights reserved.Materials Science; Physics