Phase evolution and mechanical properties of novel nanocrystalline Y2(TiZrHfMoV)2O7 high entropy pyrochlore

Karthick, G. and Raman, Lavanya and Murty, B S (2021) Phase evolution and mechanical properties of novel nanocrystalline Y2(TiZrHfMoV)2O7 high entropy pyrochlore. Journal of Materials Science & Technology, 82. pp. 214-226. ISSN 1005-0302

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High entropy pyrochlores (HEP) are potential candidates as dispersoids in the oxide dispersed strengthened steels or alloys, which can be used in nuclear reactors and supercritical boilers. For the first time, HEP oxides Y2(TiZrHfMoV)2O7 were synthesized with Y2Ti2O7 as a base structure with the B site (Ti) substituted with five cations through reverse co-precipitation technique in the nanocrystalline form at lowest synthesis temperature. The synthesis parameters for Y2(TiZrHfMoV)2O7 (5C) and other derived compositions (five compositions of four cationic systems with each cation eliminated at B site from 5C) are optimised to obtain lower crystallite and particle sizes. 5C has a smaller crystallite size (27 nm) than other single-phase compositions. The cation's influence, oxidation state, and oxygen vacancy in the phase formation were analysed through XPS. The single-phase HEPs are consolidated through spark plasma sintering. Y2(TiZrHfMo)2O7 (4C-V) shows the highest hardness among the compositions reported so far due to its finer grain size, and Y2(TiHfMoV)2O7 (4C-Zr) has a higher Young's modulus compared to other single-phase composition due to its higher degree of order in the structure. © 2021

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IITH Creators:
IITH CreatorsORCiD
Murty, B S
Item Type: Article
Uncontrolled Keywords: B site substitution; Hardness; High entropy pyrochlores; Reverse co-precipitation; Young's modulus
Subjects: Materials Engineering > Materials engineering
Divisions: Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 13 Sep 2022 07:38
Last Modified: 13 Sep 2022 07:38
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