Description:
<jats:title>Abstract</jats:title><jats:p>The title brownmillerite solid solutions are synthesized by a ceramic method starting with mixtures of CaCO<jats:sub>3</jats:sub>, Al<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, Fe<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub>, and MnO<jats:sub>2</jats:sub> (Pt crucibles, 1250 °C, 8 d).</jats:p>