Silicate superionic conductors and method of making same.

摘要

The spray-drying of a feed liquid mixture containing dissolved feed elements is used to produce precursor powders of Na<Sup>+</Sup>-super conducting sodium gadolinium silicate (Na<Sub>6</Sub>GdSi<Sub>4</Sub>O<Sub>12</Sub>), (NGS), and sodium yttrium silicate (Na<Sub>5</Sub>YSi<Sub>4</Sub>O<Sub>12</Sub>), NYS. Using these powders, very dense (>97% theoretical) solids are obtained on sintering. The resistivities of the NGS and NYS polycrystalline ceramics are 5 and 7 (Ω cm) respectively at 300°C and are dependent on the f(NGS) or f(NYS) values. In the case of NYS, the resistivity/f(NYS) relationship takes the form<MathDetails id="matha01"><MathText><![CDATA[ <img id="ia01" file="imga0001.tif" wi="35" he="21" img-content="math" img-format="tif" inline="no" /> ]]></MathText></MathDetails>Indicative of resistive and conductive phases mixed more in parallel than in series.