<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>A series of Sm‐doped Ca<sub>2</sub>Sb<sub>2</sub>O<sub>7</sub> samples is prepared by solid state reaction of CaCO<sub>3</sub>, Sb<sub>2</sub>O<sub>3</sub>, and Sm<sub>2</sub>O<sub>3</sub> (air, alumina crucible, 1150 °C, 16 h).</p> </abstract>