Conductivity, structure, and thermodynamics of Y2Ti2O7 –Y3NbO7 solid solutions

Winiarz, Piotr; Mielewczyk-Gryń, Aleksandra; Lilova, Kristina; Wachowski, Sebastian; Subramani, Tamilarasan; Abramchuk, Mykola; Dzik, Ewa; Navrotsky, Alexandra; Gazda, Maria

doi:10.1039/d0dt02156c

Title: Conductivity, structure, and thermodynamics of Y₂Ti₂O₇ –Y₃NbO₇ solid solutions

Journal Article · Tue Jul 07 00:00:00 UTC 2020 · Dalton Transactions

DOI: https://doi.org/10.1039/d0dt02156c · OSTI ID:1800121

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Univ. of Gdansk (Poland); OSTI
Univ. of Gdansk (Poland)
Arizona State Univ., Tempe, AZ (United States)

The defect fluorite yttrium niobate Y₃NbO₇ and pyrochlore yttrium titanate Y₂Ti₂O₇ solid solutions have been synthesized via a solid state synthesis route. The resulting stoichiometry of the oxides is Y_2+xTi_2-2xNb_xO₇, where x = 0 to x = 1. All of the samples were single-phase; however, for those with a predominant fluorite phase, a small amount of additional pyrochlore phase was detected. The volume of the solid solution unit cells linearly increases with increase in yttrium niobate content. The water uptake increases with (x) and the protonic defect concentration reaches almost 4.5 × 10^-3 mol mol^-1 at 300 °C. The calculated enthalpy of formation from oxides suggests strong stability for all of the compositions, with the values of enthalpy ranging from -84.6 to -114.3 kJ mol^-1. The total conductivity does not have a visible dependence on Y₃NbO₇ content. For each compound, the total conductivity is higher in wet air. Interestingly, for samples where x < 0.5, the ratio of conductivity in hydrogen to air increases with increasing temperature, while for x > 0.5, the trend is the opposite.

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Research Organization:: University of California, Davis, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-03ER46053

OSTI ID:: 1800121

Journal Information:: Dalton Transactions, Journal Name: Dalton Transactions Journal Issue: 31 Vol. 49; ISSN 1477-9226; ISSN ICHBD9

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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