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Hydration thermodynamics of proton-conducting perovskite Ba4Ca2Nb2O11.

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Title: Hydration thermodynamics of proton-conducting perovskite Ba4Ca2Nb2O11.
Authors: Sereda, Vladimir1 vladimir.sereda@urfu.ru, Malyshkin, Dmitry1, Tsvetkov, Dmitry1, Zuev, Andrey1
Source: Materials Letters. Jan2019, Vol. 235, p97-100. 4p.
Subjects: Hydration, Phase transitions, Solid oxide fuel cells, Perovskite, Thermodynamic control
Abstract: Graphical abstract Highlights • Defect structure model for Ba 4 Ca 2 Nb 2 O 11 ·xH 2 O was discussed and successfully verified. • Enthalpy of hydration was measured for Ba 4 Ca 2 Nb 2 O 11 at 419 and 200 °C. • Directly measured hydration enthalpies were compared to theoretical ones. • Enthalpy of cubic → monoclinic phase transition in Ba 4 Ca 2 Nb 2 O 11 ·0.92H 2 O was estimated. Abstract The defect structure model based on the single reaction of water incorporation, involving structural oxygen vacancies, was discussed and successfully verified using existing p H 2 O - T - x data for cubic Ba 4 Ca 2 Nb 2 O 11 · x H 2 O – a promising electrolyte material for proton-conducting solid oxide fuel cells. As a result, the enthalpy of hydration ( Δ H h y d r 0) was obtained. It was found to be close to the partial molar enthalpy of water in Ba 4 Ca 2 Nb 2 O 11 · x H 2 O as well as to the calorimetrically measured value of Δ H h y d r 0 = −107.9 ± 14.4 kJ/mol of H 2 O. Using Δ H h y d r 0 and the value of low-temperature heat of hydration, the enthalpy of the hydration-induced cubic → monoclinic phase transition in Ba 4 Ca 2 Nb 2 O 11 ·0.92H 2 O was calculated as 63.9 ± 14.2 kJ/mol of Ba 4 Ca 2 Nb 2 O 11. [ABSTRACT FROM AUTHOR]
Copyright of Materials Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Hydration thermodynamics of proton-conducting perovskite Ba4Ca2Nb2O11.
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  Data: <searchLink fieldCode="AR" term="%22Sereda%2C+Vladimir%22">Sereda, Vladimir</searchLink><relatesTo>1</relatesTo><i> vladimir.sereda@urfu.ru</i><br /><searchLink fieldCode="AR" term="%22Malyshkin%2C+Dmitry%22">Malyshkin, Dmitry</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tsvetkov%2C+Dmitry%22">Tsvetkov, Dmitry</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Zuev%2C+Andrey%22">Zuev, Andrey</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Materials+Letters%22">Materials Letters</searchLink>. Jan2019, Vol. 235, p97-100. 4p.
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  Data: <searchLink fieldCode="DE" term="%22Hydration%22">Hydration</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+transitions%22">Phase transitions</searchLink><br /><searchLink fieldCode="DE" term="%22Solid+oxide+fuel+cells%22">Solid oxide fuel cells</searchLink><br /><searchLink fieldCode="DE" term="%22Perovskite%22">Perovskite</searchLink><br /><searchLink fieldCode="DE" term="%22Thermodynamic+control%22">Thermodynamic control</searchLink>
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  Data: Graphical abstract Highlights • Defect structure model for Ba 4 Ca 2 Nb 2 O 11 ·xH 2 O was discussed and successfully verified. • Enthalpy of hydration was measured for Ba 4 Ca 2 Nb 2 O 11 at 419 and 200 °C. • Directly measured hydration enthalpies were compared to theoretical ones. • Enthalpy of cubic → monoclinic phase transition in Ba 4 Ca 2 Nb 2 O 11 ·0.92H 2 O was estimated. Abstract The defect structure model based on the single reaction of water incorporation, involving structural oxygen vacancies, was discussed and successfully verified using existing p H 2 O - T - x data for cubic Ba 4 Ca 2 Nb 2 O 11 · x H 2 O – a promising electrolyte material for proton-conducting solid oxide fuel cells. As a result, the enthalpy of hydration ( Δ H h y d r 0) was obtained. It was found to be close to the partial molar enthalpy of water in Ba 4 Ca 2 Nb 2 O 11 · x H 2 O as well as to the calorimetrically measured value of Δ H h y d r 0 = −107.9 ± 14.4 kJ/mol of H 2 O. Using Δ H h y d r 0 and the value of low-temperature heat of hydration, the enthalpy of the hydration-induced cubic → monoclinic phase transition in Ba 4 Ca 2 Nb 2 O 11 ·0.92H 2 O was calculated as 63.9 ± 14.2 kJ/mol of Ba 4 Ca 2 Nb 2 O 11. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Materials Letters is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.matlet.2018.09.172
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      – SubjectFull: Solid oxide fuel cells
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      – SubjectFull: Perovskite
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              Text: Jan2019
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