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  1. Article

    Open Access

    Correction to: Impact of prolonged heating on the color and crystallinity of bone

    G. Gallo, S. V. Ushakov, A. Navrotsky… in Archaeological and Anthropological Sciences (2023)

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  2. Article

    Open Access

    Impact of prolonged heating on the color and crystallinity of bone

    Duration of an anthropogenic fire event is one aspect of fire use and maintenance that is linked to combustion feature function but has low archaeological visibility. In this study, we describe the transformat...

    G. Gallo, S. V. Ushakov, A. Navrotsky… in Archaeological and Anthropological Sciences (2023)

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  3. No Access

    Article

    Compositional control of tunnel features in hollandite-based ceramics: structure and stability of (Ba,Cs)1.33(Zn,Ti)8O16

    The impact of composition on the tunnel features of hollandite materials for the purpose of radioactive cesium (Cs) immobilization was evaluated. The barium (Ba) to cesium (Cs) ratio was varied in the tunnel s...

    R. Grote, M. Zhao, L. Shuller-Nickles, J. Amoroso, W. Gong… in Journal of Materials Science (2019)

  4. No Access

    Article

    Enthalpies of Formation of Gd2(Ti2-xZrx)O7 Pyrochlores

    A calorimetric investigation of the enthalpies of formation of Gd2(Ti2-xZrx)O7, where 0≤ × ≤ 2 is underway. All samples exhibit pyrochlore (Fd3m) peaks in their XRD patterns. However, where x=2 significant local ...

    K. B. Helean, B. D. Begg, A. Navrotsky, B. Ebbinghaus… in MRS Online Proceedings Library (2011)

  5. No Access

    Article

    Thermal analyses of bulk amorphous oxides and silicates of zirconium and hafnium

    Amorphous pure and Y-doped ZrO2 and HfO2 were prepared by precipitation with ammonia or hydrazine. Amorphous zirconium and hafnium silicates with SiO2 content from 10 to 90 mol % were prepared by sol-gel. Crystal...

    S. V. Ushakov, C. E. Brown, A. Navrotsky, A. Demkov… in MRS Online Proceedings Library (2011)

  6. No Access

    Article

    Formation Enthalpies of Tetravalent Lanthanide Perovskites by High Temperature Oxide Melt Solution Calorimetry

    High-temperature oxide melt solution calorimetry was used to measure formation enthalpies for several compositions of perovskites of nominal stoichiometry BaPrO3 and BaCeO3. Samples were synthesized from chemical...

    S. V. Ushakov, J. Cheng, A. Navrotsky, J. R. Wu… in MRS Online Proceedings Library (2011)

  7. No Access

    Article

    Thermochemistry and melting properties of basalt

    The heat capacities of the liquid, glassy and crystalline phases of an alkali basalt have been determined from relative enthalpies measured between 400 and 1,800 K. Values given by available models of calculat...

    M. A. Bouhifd, P. Besson, P. Courtial… in Contributions to Mineralogy and Petrology (2007)

  8. No Access

    Article

    Correlation of Formation Enthalpies with Critical Amorphization Temperature for Pyrochlore and Monazite

    Systematic studies of a series of RE-titanate pyrochlore single crystals determined the formation enthalpies, $$\Delta H_{{\text{f}} - {\text{...

    K.B. Helean, A. Navrotsky, J. Lian, R.C. Ewing in MRS Online Proceedings Library (2004)

  9. No Access

    Article

    Thermodynamic properties, low-temperature heat-capacity anomalies, and single-crystal X-ray refinement of hydronium jarosite, (H3O)Fe3(SO4)2(OH)6

    Crystals of hydronium jarosite were synthesized by hydrothermal treatment of Fe(III)–SO4 solutions. Single-crystal XRD refinement with R1=0.0232 for the unique observed reflections (|Fo| > 4σF) and wR2=0.0451 for...

    J. Majzlan, R. Stevens, J. Boerio-Goates… in Physics and Chemistry of Minerals (2004)

  10. No Access

    Article

    Thermochemical Investigations of Zirconolite, Pyrochlore and Brannerite: Candidate Materials for the Immobilization of Plutonium

    Standard enthalpies of formation, ΔH°f (kJ/mol) at 298 K, were derived for three pyrochlore phases: Ca0.93Ce1.00Ti2.035O7.00 (−3656.0±5.6), Ca1.46U4+0.23U6+0.46Ti1.85O7.00 (−3610.6±4.1), Gd2Ti2O7 (−3822.5±4.9) an...

    K. B. Helean, A. Navrotsky, J. Lian, R. C. Ewing in MRS Online Proceedings Library (2003)

  11. No Access

    Article

    Enthalpy of formation of cubic yttria-stabilized zirconia

    Oxide melt solution calorimetric measurements were made to determine the enthalpy of formation of cubic-yttria-stabilized zirconia (c-YSZ) with respect to the oxides m-ZrO2 and C-type YO1.5. The enthalpy of forma...

    T. A. Lee, A. Navrotsky, I. Molodetsky in Journal of Materials Research (2003)

  12. No Access

    Article

    Phonon, Spin-Wave, and Defect Contributions to the Low-Temperature Specific Heat of α-FeOOH

    The specific heat of α-FeOOH was measured in the temperature range 0.6 to 30 K by a combination of semi-adiabatic and isothermal techniques. A broad specific-heat anomaly was detected at approximately 1 K. The da...

    J. Majzlan, A. Navrotsky, B. F. Woodfield, B. E. Lang… in Journal of Low Temperature Physics (2003)

  13. No Access

    Article

    Thermodynamics and crystal chemistry of the hematite–corundum solid solution and the FeAlO3 phase

     High-temperature oxide-melt calorimetry and Rietveld refinement of powder X-ray diffraction patterns were used to investigate the energetics and structure of the hematite–corundum solid solution and ternary p...

    J. Majzlan, A. Navrotsky, B. J. Evans in Physics and Chemistry of Minerals (2002)

  14. No Access

    Article

    Oxide melt solution calorimetry of rare earth oxides

    Key to the evaluation of the long-term durability and reactivity of REE-materials is the accurate determination of their thermodynamic properties. High-temperature oxide melt solution calorimetry offers an eff...

    K. B. Helean, A. Navrotsky in Journal of Thermal Analysis and Calorimetry (2002)

  15. No Access

    Article

    Enthalpies of formation of lanthanide oxyapatite phases

    A family of lanthanide silicates adopts an oxyapatitelike structure with structural formula Ln9.33 0.67(SiO4)6O2 (Ln = La, Sm, Nd, Gd,   = vacancy). The enthalpies of solution, ΔHS, for these materials and their ...

    A. S. Risbud, K. B. Helean, M. C. Wilding, P. Lu… in Journal of Materials Research (2001)

  16. No Access

    Article

    Calorimetric determination of the enthalpy of formation of InN and comparison with AlN and GaN

    The standard enthalpy of formation of InN at 298 K has been determined using high-temperature oxidative drop solution calorimetry in a molten sodium molybdate solvent at 975 K. Calorimetric measurements were p...

    M. R. Ranade, F. Tessier, A. Navrotsky, R. Marchand in Journal of Materials Research (2001)

  17. No Access

    Article

    Thermochemistry of rare-earth orthophosphates

    The enthalpies of formation for the compounds (RE3+)PO4, (where RE = Sc, Y, La–Nd, Sm–Lu) were determined by oxide-melt solution calorimetry. Calorimetric measurements were performed in a Calvet-type twin microca...

    S. V. Ushakov, K. B. Helean, A. Navrotsky, L. A. Boatner in Journal of Materials Research (2001)

  18. No Access

    Article

    Thermodynamic data of the high-pressure phase Mg5Al5Si6O21(OH)7 (Mg-sursassite)

     Calorimetric and P–V–T data for the high-pressure phase Mg5Al5Si6O21(OH)7 (Mg-sursassite) have been obtained. The enthalpy of drop solution of three different samples was measured by high-temperature oxide melt ...

    K.-D. Grevel, A. Navrotsky, W. A. Kahl… in Physics and Chemistry of Minerals (2001)

  19. No Access

    Article

    Calorimetric study of perovskite solid solutions in the CaSiO3–CaGeO3 system

     Enthalpies of drop solution (ΔH drop-sol) of CaGeO3, Ca(Si0.1Ge0.9)O3, Ca(Si0.2Ge0.8)O3, Ca(Si0.3Ge0.7)O3 perovskite solid solutions and CaSiO3 wollastonite were measured by high-temperature calorimetry using mo...

    H. Kojitani, A. Navrotsky, M. Akaogi in Physics and Chemistry of Minerals (2001)

  20. No Access

    Article

    Thermal expansion and structural transformations of stuffed derivatives of quartz along the LiAlSiO4–SiO2 join: a variable-temperature powder synchrotron XRD study

     The structural behavior of stuffed derivatives of quartz within the Li1− x Al1− x Si1+ x O4 system (0 ≤ x ...

    H. Xu, P. J. Heaney, A. Navrotsky in Physics and Chemistry of Minerals (2001)

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