Energetics of melting of Yb2O3 and Lu2O3 from drop and catch calorimetry and first principles computations

Fyhrie, Matthew; Hong, Qi‐Jun; Kapush, D.; Ushakov, Sergey V.; Liu, Helena; Walle, Axel van de; Navrotsky, Alexandra

doi:10.1016/j.jct.2019.01.008

Cited by 15 publications

(9 citation statements)

References 22 publications

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“…36 The thermodynamic energy has been discussed on the basis of the DFT result using these potentials. 37 The calculation was performed with a Monkhorst−Pack k-point mesh of 5 × 5 × 3 for REBCO and 4 × 4 × 4 for BRNO. The structure relaxation was performed until the force on the atoms was less than 0.02 eV/A.…”

Section: Experimental and Theoretical Calculationmentioning

confidence: 99%

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Horide

Yoshida

Kita

et al. 2022

ACS Appl. Electron. Mater.

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To fabricate high performance YBa 2 Cu 3 O 7 superconducting films and tapes, the critical current density (J c ) should be enhanced and the nanocomposite structure should be very effective in controlling the vortex pinning and J c . Although the nanoscale morphology has been a basic parameter from the early stages of nanorod control, compositional factors should be discussed to effectively control not only the superconducting order parameter distribution but also the thermodynamic parameter relating to crystal growth. In this study, a double perovskite oxide, Ba 2 RENbO 6 (RE = Yb, Lu), was incorporated in YBa 2 Cu 3 O 7 films, where the site occupancy of the RE element is focused to control the nanocomposite structure. The elongated nanorods were formed in both the YBa 2 Cu 3 O 7 +Ba 2 YbNbO 6 and YBa 2 Cu 3 O 7 +Ba 2 LuNbO 6 films. While Lu mainly existed in the nanorods, Yb was observed not only in the nanorods but also in the matrix. As a result, at the fixed nanorod content, while the matching field was larger for the YBa 2 Cu 3 O 7 +Ba 2 YbNbO 6 film, the J c in the high magnetic field was larger for the YBa 2 Cu 3 O 7 +Ba 2 LuNbO 6 film. The angular dependence of J c depended on the RE due to the pinning contribution from the Y-rich nanoparticles. These are unconventional phenomena that are not observed in the YBa 2 Cu 3 O 7 +BaMO 3 (M = Zr, Sn, Hf) films. Thus, the site occupancy of the RE element affects the J c characteristics. The selforganization and the nanocomposite structure can be designed by considering the site occupancy as a variable parameter.

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Section: Experimental and Theoretical Calculationmentioning

confidence: 99%

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Horide

Yoshida

Kita

et al. 2022

ACS Appl. Electron. Mater.

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“…The melting temperature of Y 2 Si 2 O 7 calculated from an average of the onsets of six melting peaks is 2071 ± 3 K. The uncertainties for the enthalpy of fusion and melting temperature are reported as two standard deviations of the mean. The enthalpies of fusion for Y 2 Si 2 O 7 from this study, for CaYb 4 Si 3 O 13 , for other coating materials from our previous study, 13 and their binary oxide components 29,31–35 are given in Table 4.…”

Section: Resultsmentioning

confidence: 93%

“…Green, 21 blue, 16 and red 16 spheres are reference values. for other coating materials from our previous study, 13 and their binary oxide components 29,[31][32][33][34][35] are given in Table 4. These enthalpies of fusion are used to calculate the enthalpies of mixing as ΔH mix = ΔH s − ΔH fusion among molten CMAS, the coating materials, CaYb 4 Si 3 O 13 , and their binary oxide components.…”

Section: High-temperature Solution Calorimetry and Differential Therm...mentioning

confidence: 99%

Energetics of reactions between ceramic coating materials and their binary oxide components with silicate melts

et al. 2022

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This paper summarizes our previous and current studies of using hightemperature calorimetry to investigate the energetics of reactions of ceramic coating materials (e.g., yttrium disilicate and 7-wt% yttria-stabilized zirconia) and their binary oxide components with silicate melts in the CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) system. Such interactions are found to become stronger (more exothermic) with increasing difference in acid-base character between these materials and the melt. Our results suggest that the reactivity between the coating materials and the melt increases with decreasing thermodynamic stability (less exothermic enthalpy of formation from oxide components) of the coating material. They also suggest that ceramic coating materials made from binary oxides that have less exothermic enthalpies of solution and mixing are less susceptible to CMAS melt corrosion when in contact with an acidic, relatively polymerized, melt rich in SiO 2 . Thus, we propose that new coating material formulation and CMAS melt corrosion mitigation strategies should be optimized based on the energetic contributions of their binary oxide components.

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“…[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] The CNL technology inspired the measurement of heats of fusion of several refractory materials using a recently designed "drop-n-catch calorimeter". 9,[50][51][52][53][54][55] The cooling traces method with aerodynamic levitation has been applied to melting temperature measurements of a variety of ceramics. 10,50,[56][57][58] The earlier cooling traces experiments were conducted using an ambient atmosphere CNL system.…”

Section: Author Manuscriptmentioning

confidence: 99%

Melting temperature measurement of refractory oxide ceramics as a function of oxygen fugacity using containerless methods

et al. 2020

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Energetics of melting of Yb2O3 and Lu2O3 from drop and catch calorimetry and first principles computations

Cited by 15 publications

References 22 publications

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Energetics of reactions between ceramic coating materials and their binary oxide components with silicate melts

Melting temperature measurement of refractory oxide ceramics as a function of oxygen fugacity using containerless methods

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Energetics of melting of Yb2O3 and Lu2O3 from drop and catch calorimetry and first principles computations

Cited by 15 publications

References 22 publications

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa2Cu3O7 Superconducting Films

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa2Cu3O7 Superconducting Films

Energetics of reactions between ceramic coating materials and their binary oxide components with silicate melts

Melting temperature measurement of refractory oxide ceramics as a function of oxygen fugacity using containerless methods

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Product

Resources

About

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films