X-ray and neutron diffraction studies of lead iron niobate ceramics and single crystals

Publisher Website
Google Scholar
Abstract
Ceramics of Pb(FeNb)0.5O3 have been prepared by the usual sintering technique and are characterized by X-ray diffraction, electrical measurements and scanning electron microscopy. Neutron powder diffraction data of the ceramics were collected at room temperature and at - 183°C and refined using the Rietveld technique. The space group of the material at both temperatures was found to be R3m. Various refined parameters are reported and compared with earlier measurements. Single crystals of this material were grown from flux and characterized. A quasi-continuous X-ray diffraction photograph of the crystal was recorded as a function of temperature and lattice parameters accurately measured. The present investigation confirms that Pb(FeNb)0.5O3 undergoes only one phase transition, viz., FR (R3m) → Cubic (m3m) within the temperature range -183 to 150°C.