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On Sr 1-xNaxSiO3-0.5x New Superior Fast Ion Conductors. -Sr1-xNaxSiO3-0.5x (x = 0.1, 0.2, 0.3, 0.4) is prepared by solid state reaction of stoichiometric mixtures of SrCO 3, Na2CO3, and silica powder (air, 1050 C, 24-96 h). Undoped SrSiO3 is also prepared by sol-gel processing through mixing an EtOH solution of Si(O-Et)4 with an aqueous solution of Sr(OH) 2 and precipitation with conc. NH3 followed by drying and firing (1. 920 C, 12 h, 2. 1050 C, 48 h, 90% purity). The obtained Na-doped materials are polycrystalline with a significant amorphous fraction. Na is predominantly located in the latter and only levels below the Na detection limit are present in the crystalline SrSiO 3 phase (powder neutron diffraction). Ionic conductivities increase with increasing amorphous content indicating the glassy phase being responsible for the conductivity. -(EVANS*, I. R.; EVANS, J. S. O.; DAVIES, H. G.; HAWORTH, A. R.; TATE, M. L.; Chem. Mater. 26 (2014) 18, 5187-5189, http://dx.doi.org/10.1021/cm502850m ; Dep. Chem., Univ. Durham, Durham DH1 3LE, UK; Eng.) -J. Schramke 46-010