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Abstract
Compositional variations in barium sodium niobate cause optical scattering losses as a result of the associated refractive index and phase matching temperature changes. Those variations due to nonstoichiometry were examined in detail by liquidus temperature measurements, thermogravimetry and ferroelectric transition temperatures. A more reliable estimate of the maximum melting or dystectic composition of 0.08 Na 2O : 0.41 BaO : 0.51 Nb 2O 5 was obtained. However there is some question as to whether this composition can be maintained because of sodium oxide volatilization, barium oxide reactivity with the Pt crucible, and possible phase separation effects in the liquid. In addition, the presence of contaminants such as CaO and SrO and the presence of Nb 4+ ions in the grown crystal may also contribute significantly to refractive index variations during the crystal growth of barium sodium niobate.
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