Torre Gamarra, Carmen de laWoszczak, M.Levenfeld Laredo, BelénVarez, AlejandroGarcía González, E.Urones-Garrote, E.Di Noto, Vito2021-02-102021-02-102018-04-07Journal of Materials Chemistry A, 6(13), Apr. 2018, Pp. 5430-54422050-7488https://hdl.handle.net/10016/31903The La2LiNbO6 perovskite has been prepared in the polycrystalline form by a solid state reaction. Structural characterization by means of monochromatic X-ray and neutron powder diffraction (XRD and ND) and Rietveld refinement showed that the crystal structure belongs to the group of 1 : 1 B-site rock-salt ordered double perovskites with the most common tilting system amongst them being a-a-b+ (S. G. P21/n, a = 5.61612(3), b = 5.76645(2), c = 7.94107(4) degrees A, b = 90.276(2)degrees). Scanning Transmission Electron Microscopy (STEM) evidences that there is no cross-substitution between Li and Nb and that a remaining portion of lanthanum is randomly located in the projected positions of lithium. Impedance spectroscopy has been used to analyse the electrical-response properties of the materials. Conductivity is strongly dependent on the relative humidity (RH), changing by about 3 orders of magnitude between 25 and 90% RH. However, no conductivity increase with change in RH% is observed when the lateral surfaces of the sensor are covered with paraffin. This confirms that adsorption of water by the sample plays a crucial role in modulating the conduction mechanism. La2LiNbO6 also exhibits a very good durability, reproducibility, response time, hysteresis and dynamic linearity to be considered as a promising sensing material for a practical humidity sensor.13eng© 2018 Royal Society of ChemistryHumidity sensorDouble perovskiteImpedance spectroscopyNeutron diffractionProton conductorresearch articleMaterialeshttps://doi.org/10.1039/c7ta09496eopen access5430135442Journal of Materials Chemistry A6AR/0000021223