<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The title ceramic is prepared by solid state reaction of CaO, Fe<sub>2</sub>O<sub>3</sub>, and Fe in a ratio of 1:2:1 (alumina crucible, 1100 °C for 24 h and 900 °C for 48 h).</p> </abstract>