Non-stoichiometric phases – composition, properties and phase transitions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43915527" target="_blank" >RIV/60461373:22310/18:43915527 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22810/18:43915527

Result on the web

<a href="https://link.springer.com/content/pdf/10.1007%2F978-3-319-45899-1_8.pdf" target="_blank" >https://link.springer.com/content/pdf/10.1007%2F978-3-319-45899-1_8.pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-319-45899-1_8" target="_blank" >10.1007/978-3-319-45899-1_8</a>

Result language

angličtina

Original language name

Non-stoichiometric phases – composition, properties and phase transitions

Original language description

Nonstoichiometric phases constitute a large family of technologically important materials. Among them, the inorganic materials whose variable stoichiometry of some components originates from their exchange with surrounding atmosphere represent particular thermodynamic systems referred to a partly open system. The phase equilibria in these systems including the homogeneous crystallochemical reactions of the involved crystal defects can be effectively treated using the thermodynamic potential called hyper-free energy derived from the Gibbs free energy by Legendre transformation with respect to the amounts of free components. In this chapter, we focus on general thermodynamic description of systems with variable content of components shared with a dynamical atmosphere, their essential material quantities being influenced by variable stoichiometry, conditions for homogeneous crystallochemical equilibria as well as for phase transitions. The influence of variable stoichiometry on material properties such as isobaric thermal expansion, isothermal compressibility and in particular heat capacity is analyzed and divided into two parts: the direct effect on conventional isoplethal quantities due to deviation from stoichiometry, and so-called saturation contributions determining the difference in material properties measured under isoplethal and isodynamical conditions (constant activities of free components). In the last part, the construction of phase diagrams of partly open systems is demonstrated on several examples of oxide systems, and the relevant phase transitions are classified and discussed.

Czech name

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Czech description

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Type

C - Chapter in a specialist book

CEP classification

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OECD FORD branch

10403 - Physical chemistry

Project

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Continuities

N - Vyzkumna aktivita podporovana z neverejnych zdroju

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Book/collection name

Thermal Physics and Thermal Analysis: From Micro to Macro

ISBN

978-3-319-45899-1

Number of pages of the result

18

Pages from-to

177-194

Number of pages of the book

585

Publisher name

Springer International Publishing Switzerland

Place of publication

Cham

UT code for WoS chapter

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