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Hackenberger, Wesley
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article
Devitrification and dielectric properties of (Na2O,BaO)–Nb2O5–SiO2 and (K2O,SrO)–Nb2O5–SiO2 glass–ceramics
Abstract
<jats:p>(Na<jats:sub>2</jats:sub>O,BaO)–Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>–SiO<jats:sub>2</jats:sub> and (K<jats:sub>2</jats:sub>O,SrO)–Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>–SiO<jats:sub>2</jats:sub> glass ribbons with varying proportions of alkali and alkaline earth were formed using roller quenching. (Na<jats:sub>2</jats:sub>O,BaO)–Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>–SiO<jats:sub>2</jats:sub> glasses of compositions devitrified to form Ba<jats:sub>2</jats:sub>NaNb<jats:sub>5</jats:sub>O<jats:sub>15</jats:sub> (in the form of ∼80 nm crystallites in an amorphous matrix) yielded frequency-stable dielectric constants of ∼250 and losses of ∼0.05. Such low losses and frequency stabilities were also observed from (K<jats:sub>2</jats:sub>O,SrO)–Nb<jats:sub>2</jats:sub>O<jats:sub>5</jats:sub>–SiO<jats:sub>2</jats:sub> glasses of compositions forming predominantly KSr<jats:sub>2</jats:sub>Nb<jats:sub>5</jats:sub>O<jats:sub>6</jats:sub> (∼30 nm crystals), yielding dielectric constants of ∼400. Both optimized compositions showed moderate decreases in dielectric constant with increasing temperature.</jats:p>