A dual phase glass–ceramic composite was produced by heating a CaLa(PO3)5 glass at 800C for 20h. The glass–ceramic consists of intertwined crystalline La(PO3)3 and amorphous Ca(PO3)2 with an overall conductivity of 1.52 x 10−5S/cm at 550C in humidified air. For the water vapor treated glass, the vibration modes of the incorporated water, as well as of P–OH groups, were detected by infrared spectroscopy in the range 3440–1660/cm. The conductivity of the glass–ceramic was higher in humidified air than in dry air, consistent with proton conduction. Proton Conduction and Characterization of an La(PO3)3–Ca(PO3)2 Glass–Ceramic. G.Zhang, R.Yu, S.Vyas, J.Stettler, J.A.Reimer, G.Harley, L.C.De Jonghe: Solid State Ionics, 2008, 178[35-36], 1811-6