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Issue 13, 2018
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Interplay between humidity, temperature and electrical response of a conductivity sensor based on a La2LiNbO6 double perovskite

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Abstract

The 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 aab+ (S. G. P21/n, a = 5.61612(3), b = 5.76645(2), c = 7.94107(4) Å, β = 90.276(2)°). 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.

Graphical abstract: Interplay between humidity, temperature and electrical response of a conductivity sensor based on a La2LiNbO6 double perovskite

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Publication details

The article was received on 27 Oct 2017, accepted on 26 Jan 2018 and first published on 26 Jan 2018


Article type: Paper
DOI: 10.1039/C7TA09496E
Citation: J. Mater. Chem. A, 2018,6, 5430-5442
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    Interplay between humidity, temperature and electrical response of a conductivity sensor based on a La2LiNbO6 double perovskite

    C. D. L. Torre-Gamarra, M. Woszczak, B. Levenfeld, A. Varez, E. García-González, E. Urones-Garrote and V. Di Noto, J. Mater. Chem. A, 2018, 6, 5430
    DOI: 10.1039/C7TA09496E

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