Abstract
Birthday UNIVERSITY OF COLOMBO Birthday 11.6568 Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:Table Normal; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:Times New Roman; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Pellets of K 1-x Na x NbO 3 mixed system of different concentration have been prepared by solid solution reaction method. The subcell parameters & grain size have been calculated using X-ray diffraction data for mixed K 1-x Na x NbO 3 system where x is varied from 0, 20, 40, 50, 80, 100%. The variation of unitcell parameters and grain size with composition, at room temperature have been reported. Dielectric constant and loss tangent at room temperature and at different frequencies have also been reported. doi:10.4038/sljp.v2i0.176 Sri Lankan Journal of Physics, Vol.2 (2001) 13-19
Highlights
Potassium Sodium Niobate (PSN), ceramics with perovskite structure is a promising piezo- ceramic material due to relatively low dielectric constant and high electromechanical coupling coefficient, especially near the equimolar composition
Six compositions were prepared by weighing the sodium carbonate, potassium carbonate and niobium pentaoxide in proper proportion varying from NaNbO3 to KNbO3 by a step of 20% and one of equal (50-50) composition
Room temperature X-ray diffraction patterns of all the prepared compositions have been obtained on a SEIFERT 3000P, X-ray diffractometer using filtered CuKα1 radiation of 1.540598Å wavelength, in which Ni is used as filter
Summary
Potassium Sodium Niobate (PSN), ceramics with perovskite structure is a promising piezo- ceramic material due to relatively low dielectric constant and high electromechanical coupling coefficient, especially near the equimolar composition. These properties makes the material desirable for certain solid ultrasonic delay line applications which require the use of thin – section transducers. X-ray diffraction studies that several phase transitions with high spontaneous polarization occur between –200oC and 600oC in this system. These ceramics are difficult to sinter and the studies on the influence of rare- earth doping are meager. In this communication we have taken XRD pattern and report the effect on the lattice parameter and grain size of different concentration of starting materials
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