Issue 13, 2018

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

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

Supplementary files

Article information

Article type
Paper
Submitted
27 ኦክቶ 2017
Accepted
26 ጃንዩ 2018
First published
26 ጃንዩ 2018

J. Mater. Chem. A, 2018,6, 5430-5442

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

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements