<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>The title microspheres are hydrothermally synthesized from (NH<sub>4</sub>)<sub>2</sub>HPO<sub>4</sub>, LiOH, and FeSO<sub>4</sub> in sucrose solution (autoclave, 180 °C, 0.5—16 h).</p> </abstract>