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Crystals 2019, 9(2), 91; https://doi.org/10.3390/cryst9020091

Terbium Substituted Lanthanum Orthoniobate: Electrical and Structural Properties

Department of Solid State Physics, Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland
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Received: 2 January 2019 / Revised: 5 February 2019 / Accepted: 6 February 2019 / Published: 11 February 2019
(This article belongs to the Special Issue Ceramic Conductors)
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Abstract

The results of electrical conductivity studies, structural measurements and thermogravimetric analysis of La1−xTbxNbO4+δ (x = 0.00, 0.05, 0.1, 0.15, 0.2, 0.3) are presented and discussed. The phase transition temperatures, measured by high-temperature x-ray diffraction, were 480 °C, 500 °C, and 530 °C for La0.9Tb0.1NbO4+δ, La0.8Tb0.2NbO4+δ, and La0.7Tb0.3NbO4+δ, respectively. The impedance spectroscopy results suggest mixed conductivity of oxygen ions and electron holes in dry conditions and protons in wet. The water uptake has been analyzed by the means of thermogravimetry revealing a small mass increase in the order of 0.002% upon hydration, which is similar to the one achieved for undoped lanthanum orthoniobate. View Full-Text
Keywords: lanthanum orthoniobate; terbium orthoniobate; protonic conductivity; impedance spectroscopy; thermogravimetric analysis; water uptake lanthanum orthoniobate; terbium orthoniobate; protonic conductivity; impedance spectroscopy; thermogravimetric analysis; water uptake
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Dzierzgowski, K.; Wachowski, S.; Gazda, M.; Mielewczyk-Gryń, A. Terbium Substituted Lanthanum Orthoniobate: Electrical and Structural Properties. Crystals 2019, 9, 91.

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