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Research Article | Open Access

Influence of La3+ ion in the yttria matrix in improving the microhardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating

Jijimon K. THOMASa( ), Mathew C. T.a, Jacob KOSHYa, Sam SOLOMONa
Electronic Materials Research Laboratory, Department of Physics, Mar Ivanios College, Thiruvananthapuram 695015, Kerala, India
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Abstract

In the present work, hybrid sintering technique which couples the resistive heating and microwave heating is employed to sinter infrared transparent La0.15Y1.85O3 to 99.2% of the theoretical density for the first time to the best of our knowledge. The presence of La3+ in the yttria matrix improves the hardness properties to a greater extent without affecting the transmittance properties, but there is a deterioration in the thermal properties of the sample. So we have limited our studies to La0.15Y1.85O3 which shows better optical, thermal, and hardness properties. The pellets fabricated from the ultra-fine nano powder with average particle size of ~12 nm synthesized by combustion technique and sintered at 1430 ℃ with an average grain size of 0.22 µm show ~80.1% transmittance in the UV-visible region and 81% in mid infrared region. For a comparative study of the optical, mechanical, and thermal properties, two other variants of sintering strategies namely conventional sintering and microwave sintering are also employed. A comprehensive analysis on the hardness reveals that the hardness of the pellets sintered via hybrid heating is 9.73 GPa and is superior to the pellets sintered using the other two techniques. The thermal conductivity of the sample is also analyzed in detail. The results clearly indicate that the La0.15Y1.85O3 ultra-fine nano powder synthesised by the single-step combustion method and sintered via microwave hybrid heating shows better transmittance properties without compromising the mechanical properties, and can be used very effectively for the fabrication of infrared transparent windows and domes.

Keywords

La3+ concentrationmicrohardnesshybrid sinteringinfrared transparent ceramicsthermal conductivity

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Journal of Advanced Ceramics
Volume 6 Issue 3,
September 2017
Pages 240-250
DOI: 10.1007/s40145-017-0235-3
Cite this article:
THOMAS JK, T. MC, KOSHY J, et al. Influence of La3+ ion in the yttria matrix in improving the microhardness of infrared transparent nano LaxY2-xO3 sintered via hybrid heating. Journal of Advanced Ceramics, 2017, 6(3): 240-250. https://doi.org/10.1007/s40145-017-0235-3

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Received: 26 January 2017
Revised: 29 May 2017
Accepted: 31 May 2017
Published: 29 September 2017
© The author(s) 2017

Open Access The articles published in this journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons. org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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