Abstract
Single crystals of the new Bi(III) arsenate, Na3Bi(AsO4)2 have been isolated and their structure has been determined by X-ray diffraction. This compound crystallizes in the monoclinic space group P21/n with a = 5.5275 (2) Å; b = 19.271 (7) Å; c = 7.156 (3) Å, β = 92.104 (32)° and Z = 4. Na3Bi(AsO4)2 features a three-dimensional open anionic framework made up of corner-sharing BiO6 and AsO4 polyhedra. Its structure can be described as buckled infinite anionic layers parallel to (001) planes, connected via As–O–Bi bridges to form a three-dimensional open framework. This architecture gives rise to wide tunnels running along the [100] direction where the sodium ions are located. The ionic conductivity measurements are performed on pellets of 91% relative density. The highest overall conductivity of 1.3 × 10−5 S cm−1 was found at 500 °C with Ea = 0.76 eV. The value of the activation energy obtained from the analysis of the impedance spectra suggests the ionic transport in Na3Bi(AsO4)2 is essentially due to simple hopping of Na+ cations. Furthermore, the frequency dependence of AC conductivity was shown to obey the Jonscher universal power law.
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