Thermodynamic investigation of uranyl vanadate minerals: Implications for structural stability

Tyler L. Spano, Ewa A. Dzik, Melika Sharifironizi, Megan K. Dustin, Madison Turner, Peter C. Burns

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Understanding the crystal chemistry, materials properties, and thermodynamics of uranyl minerals and their synthetic analogs is an essential step for predicting and controlling the long-term environmental behavior of uranium. Uranyl vanadate minerals are relatively insoluble and widely disseminated within U ore deposits and mine and mill tailings. Pure uranyl vanadate mineral analogs were synthesized for investigation using high-temperature drop solution calorimetry. Calculated standard-state enthalpies of formation were found to be -4928.52 ± 13.90, -5748.81 ± 13.59, and -6402.88 ± 21.01, kJ/mol for carnotite, curienite, and francevillite, respectively. Enthalpies of formation from binary oxides for uranyl vanadate minerals exhibit a positive linear correlation as a function of the acidity of oxides. Normalized charge deficiency per anion (NCDA) is presented to relate bonding requirements of the structural units and interstitial complexes. An exponential correlation was observed between NCDA and energetic stability (enthalpy of formation from binary oxides) for the studied minerals. Additionally, NCDA and oxide acidity exhibit an exponential correlation where decreasing oxide acidity results in an exponential decrease in NCDA. The number of occurrences of uranyl vanadate mineral species are found to correlate with both enthalpy of formation from oxides and NCDA.

Original languageEnglish (US)
Pages (from-to)1149-1153
Number of pages5
JournalAmerican Mineralogist
Volume102
Issue number6
DOIs
StatePublished - Jun 1 2017

Fingerprint

Vanadate minerals
vanadates
structural stability
Oxides
thermodynamics
Anions
minerals
oxide
anion
Thermodynamics
enthalpy
Enthalpy
mineral
oxides
anions
Acidity
acidity
Minerals
Crystal chemistry
Ore deposits

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Spano, Tyler L. ; Dzik, Ewa A. ; Sharifironizi, Melika ; Dustin, Megan K. ; Turner, Madison ; Burns, Peter C. / Thermodynamic investigation of uranyl vanadate minerals : Implications for structural stability. In: American Mineralogist. 2017 ; Vol. 102, No. 6. pp. 1149-1153.
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Thermodynamic investigation of uranyl vanadate minerals : Implications for structural stability. / Spano, Tyler L.; Dzik, Ewa A.; Sharifironizi, Melika; Dustin, Megan K.; Turner, Madison; Burns, Peter C.

In: American Mineralogist, Vol. 102, No. 6, 01.06.2017, p. 1149-1153.

Research output: Contribution to journalArticle

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