Thermodynamics of schafarzikite (FeSb2O4) and tripuhyite (FeSbO4)
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F23%3A10168787" target="_blank" >RIV/00025798:_____/23:10168787 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1007/s00269-023-01249-2" target="_blank" >https://doi.org/10.1007/s00269-023-01249-2</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s00269-023-01249-2" target="_blank" >10.1007/s00269-023-01249-2</a>
Alternative languages
Result language
angličtina
Original language name
Thermodynamics of schafarzikite (FeSb2O4) and tripuhyite (FeSbO4)
Original language description
In this work, we investigated the thermodynamic properties of synthetic schafarzikite (FeSb2O4) and tripuhyite (FeSbO4). Low-temperature heat capacity ( C p) was determined by relaxation calorimetry. From these data, third-law entropy was calculated as 110.7 +/- 1.3 J mol(-1)K(-1) for tripuhyite and 187.1 +/- 2.2 J mol(-1) K-1 for schafarzikite. Using previously published Delta(f)G degrees values for both phases, we calculated their Delta H-f degrees as -947.8 +/- 2.2 for tripuhyite and -1061.2 +/- 4.4 for schafarzikite. The accuracy of the data sets was tested by entropy estimates and calculation of Delta H-f degrees from estimated lattice energies (via Kapustinskii equation). Measurements of C-p above T = 300 K were augmented by extrapolation to T = 700 K with the frequencies of acoustic and optic modes, using the Kieffer C-p model. A set of equilibrium constants (log K) for tripuhyite, schafarzikite, and several related phases was calculated and presented in a format that can be employed in commonly used geochemical codes. Calculations suggest that tripuhyite has a stability field that extends over a wide range of pH-p epsilon conditions at T = 298.15 K. Schafarzikite and hydrothermal oxides of antimony (valentinite, kermesite, and senarmontite) can form by oxidative dissolution and remobilization of pre-existing stibnite ores.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10504 - Mineralogy
Result continuities
Project
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Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physics and Chemistry of Minerals
ISSN
0342-1791
e-ISSN
1432-2021
Volume of the periodical
50
Issue of the periodical within the volume
3
Country of publishing house
DE - GERMANY
Number of pages
11
Pages from-to
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UT code for WoS article
001043337700001
EID of the result in the Scopus database
2-s2.0-85167414053