<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Fe<sub>3</sub>P<sub>5</sub>SiO<sub>19</sub> is prepared by calcination of stoichiometric amounts of FePO<sub>4</sub>, SiO(OH)<sub>2</sub>, and NH<sub>4</sub>H<sub>2</sub>PO<sub>4</sub> in air (1000 °C, 12 h).</p> </abstract>