<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>Orthorhombic Li<sub>2</sub>NaPO<sub>4</sub> is synthesized by stirring aqueous solutions of LiOH, NaOH, and H<sub>3</sub>PO<sub>4</sub> followed by drying at 700 °C in air overnight.</p> </abstract>