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Volume : III, Issue : III, April - 2013 FERROELECTRIC PHASE TRANSITION IN SODIUM DIHYDROGEN ORTHOPHOSPHATE SURENDRA YADAVA AND B. K. PANDEY Published By : Laxmi Book Publication Abstract : Ferroelectric transition and variation of dielectric constant with temperature
in a compound is very important for the better application of the materials. In the present
work we have studied the variation of dielectric constant with temperature of Sodium
Dihydrogen Orthophosphate. During our investigation it is found that the temperature
variation of the dielectric constant in heating cycle shows a very sharp jump in the
dielectric constant, where the compound attains value from its value of 5600 to 42000 at
the temperature of 42C (Fig. 1 & 2) which again falls in temperature range of 460C to
51C. The cooling curve has nearly same nature, but has moderately low value of
dielectric constant and also the peaks are less sharp. Sharp rise in the dielectric constant
have been explained on the basis of activated polarization process and ferroelectric
transition at 46 0C while the initial fluctuations in dielectric constant between 27 0C to 46
0C is due to the structural imbalance occurred by the elimination of water molecule from
the compound. The occurrence of broad peak in is explained on the basis of relaxor
systems which are generally due to heterovalent disorder. In the cooling cycle slight
deviation in result have been explained on the basis of hysteresis and prolonged heating
(annealing) of the specimen, as the annealing also shifts the transition temperature. Keywords : Article : Cite This Article : SURENDRA YADAVA AND B. K. PANDEY, (2013). FERROELECTRIC PHASE TRANSITION IN SODIUM DIHYDROGEN ORTHOPHOSPHATE. Indian Streams Research Journal, Vol. III, Issue. III, http://oldisrj.lbp.world/UploadedData/2232.pdf References : - Hippel, Von, Breckenridge, A., Chesley, R.G., and Tisza, L., 1946, Ind .Eng. Chem., 38 , p.1097.
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