Journal of the Ceramic Society of Japan, Supplement
Online ISSN : 1349-2756
ISSN-L : 1349-2756
Journal of the Ceramic Society of Japan, Supplement 112-1, PacRim5 Special Issue
Session ID : 10
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Growth of Silver Niobate Single Crystals and Their Dielectric Properties
Satoshi WADAShingo URAKIHirofumi KAKEMOTOTakaaki TSURUMI
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Abstract
The ferroelectric silver niobate (AgNbO3) single crystals were grown using two kinds of crystal growth methods, and their dielectric properties were investigated. At first, the pure AgNbO3 single crystals were grown using a conventional flux method with a AgCl solvent. Using this method, the AgNbO3 single crystals with a size of 5 mm cube were obtained. The dielectric measurement of the AgNbO3 crystals indicated the two additional dielectric maximums of 460°C and 520°C as well as some dielectric peaks reported in the AgNbO3 ceramics. Thus, these two additional peaks were investigated using an in-situ domain observation. As a result, this observation revealed that these two peaks at 460°C and 520°C originated from the melting behavior of the residual AgCl (m.p.=455°C) in the crystals. To study an intrinsic dielectric property of the AgNbO3 crystals, the impurity-free single crystals must be required. Fortunately, it was found that the AgNbO3 crystals completely melted above 1200°C, and from these liquid phase, the AgNbO3 crystals with their stoichiometric composition were formed with decreasing temperature. Thus, we developed this new crystal growth technique from the stoichiometric melts for the AgNbO3 crystals, and named as a slow cooling method. Finally, we obtained the impurity-free AgNbO3 crystals with sizes of around 3 mm cube. Using these crystals, their dielectric properties were investigated.
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© 2004 The Ceramic Society of Japan
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