YBa<sub>2</sub>SnO<sub>5.5</sub>: A New Phase in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>-SnO<sub>2</sub>System

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<jats:p>A new compound, YBa<jats:sub>2</jats:sub>SnO<jats:sub>5.5</jats:sub>was found forming in YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>7-<jats:italic>x</jats:italic></jats:sub>-SnO<jats:sub>2</jats:sub>system. Preparation of YBa<jats:sub>2</jats:sub>SnO<jats:sub>5.5</jats:sub>as a single phase compound by solid state reaction method is reported for the first time. This new compound has a cubic structure with a lattice parameter<jats:italic>a</jats:italic>=8.42 Å. Kinetics of sintering and its dielectric properties are briefly discussed. No chemical reaction between YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>7-<jats:italic>x</jats:italic></jats:sub>and YBa<jats:sub>2</jats:sub>SnO<jats:sub>5.5</jats:sub>was observed even at an elevated temperatue of 950°C. Sintered YBa<jats:sub>2</jats:sub>SnO<jats:sub>5.5</jats:sub>is proposed as a new substrate material for the preparation of superconducting YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>7-<jats:italic>x</jats:italic></jats:sub>thin films.</jats:p>

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