Effect of Doping ZrO<sub>2</sub> on Structural and Thermal Properties

Effect of Doping ZrO<sub>2</sub> on Structural and Thermal Properties

The aim of this paper was to investigate the structure and thermal properties of zirconia ceramics co-doped with rare earth (RE) elements in equimolar concentrations. We prepared (1 − x)ZrO<sub>2</sub> − x(yLa<sub>2</sub>O<sub>3</sub> + yNd<sub>2</sub>...

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Bibliographic Details
Main Authors:	Mirela Petriceanu, Florentina Gabriela Ioniță, Radu Robert Piticescu, Adrian Ionuț Nicoară, Alexandru Cristian Matei, Miruna Adriana Ioța, Ioan Albert Tudor, Ștefania Caramarin, Cristina Florentina Ciobota
Format:	Article
Language:	English
Published:	MDPI AG 2024-11-01
Series:	Inorganics
Subjects:	rare earth zirconate RE-ZrO<sub>2</sub> structural properties thermal stability thermal conductivity
Online Access:	https://www.mdpi.com/2304-6740/12/11/290
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Summary:	The aim of this paper was to investigate the structure and thermal properties of zirconia ceramics co-doped with rare earth (RE) elements in equimolar concentrations. We prepared (1 − x)ZrO<sub>2</sub> − x(yLa<sub>2</sub>O<sub>3</sub> + yNd<sub>2</sub>O<sub>3</sub> + ySm<sub>2</sub>O<sub>3</sub> + yGd<sub>2</sub>O<sub>3</sub> + yYb<sub>2</sub>O<sub>3</sub>) (x = 0.2; y = 0.2) powders by a hydrothermal method in mild conditions (200 °C, 2 h, 60–100 atm.) The powder was analyzed by XRD, SEM-EDAX, BET, and FT-IR after synthesis and heat treatments at 1200 °C and 1500 °C. The samples exhibit good thermal stability, with a single cubic phase presented after heat treatment at 1500 °C. The compound exhibits a low thermal conductivity (0.61 W·m<sup>−1</sup>·K<sup>−1</sup>), a low heat capacity (0.42 J·g<sup>−1</sup>K<sup>−1</sup>), and a low thermal diffusivity (0.34 mm<sup>2</sup>·s<sup>−1</sup>). The values are lower than reported for conventional RE-doped zirconia.
ISSN:	2304-6740