Crystal structure, phase transitions, and thermodynamic properties of magnesium metavanadate (MgV2O6)

Pei, Guishang; Pan, Cheng; Zhong, Dapeng; Xiang, Junyi; Lv, Xuewei

doi:10.1016/j.jma.2022.05.011

Cited by 4 publications

(5 citation statements)

References 30 publications

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“…From literature, the Neumann–Kopp method yielded a much higher error than that of the experimental values at high temperatures. In some compounds, the predicted values can deviate from the experimental one by over 5%, thereby impacting the accuracy of other calculated thermal properties linked to heat capacity 30–32 . The predicted deviation could have been caused by the unique structural characteristics of the simple crystal and the studied one.…”

Section: Resultsmentioning

confidence: 96%

“…Thermodynamically, the feasibility of a specific chemical reaction at a certain pressure and temperature is dependent on the Gibbs free energy variation ( ΔG ) 33,34 . Assuming that the pressure is constant at 1 atm, chemical reactions can occur spontaneously at specific temperatures, when the ΔG° values are negative 32 …”

Section: Resultsmentioning

confidence: 99%

“…In some compounds, the predicted values can deviate from the experimental one by over 5%, thereby impacting the accuracy of other calculated thermal properties linked to heat capacity. [30][31][32] The predicted deviation could have been caused by the unique structural characteristics of the simple crystal and the studied one. For example, CaO and V 2 O 5 have cubic and orthorhombic crystal structures, respectively.…”

Section: Thermodynamic Propertiesmentioning

confidence: 99%

“…33,34 Assuming that the pressure is constant at 1 atm, chemical reactions can occur spontaneously at specific temperatures, when the ΔG • values are negative. 32 Generally, previous studies have utilized CaO, CaCO 3 , Ca(OH) 2 , and V 2 O 5 , as the precursors to generate Ca 3 (VO 4 ) 2 . Possible chemical reactions if using CaO and V 2 O 5 as precursors are described as follows:…”

Section: Applications Of Thermodynamic Properties In Materials Fabric...mentioning

confidence: 99%

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High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

Pei,

Jiao,

et al. 2024

J Am Ceram Soc.

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Ca3(VO4)2 is a promising candidate for applications in ferroelectric, laser host, and optical materials owing to its unique whitlockite structure and excellent physicochemical properties. In this study, the Ca3(VO4)2 powder was fabricated via a conventional solid‐phase route in air, using V2O5 and CaO as precursors. The trigonal Ca3(VO4)2 belongs to the space group R3c, having unit cell parameters of a = 10.8074 Å, b = 10.8074 Å, and c = 37.98871 Å, respectively. Ca3(VO4)2 melts congruently at 1680 K, as determined from differential scanning calorimetry measurements of the thermal profile of the second heating test. Enthalpy changes in Ca3(VO4)2 were experimentally determined for the first time across temperatures between 573 and 1623 K by drop calorimetry. The temperature‐dependent molar heat capacity of Ca3(VO4)2 was calculated from the enthalpy changes at elevated temperatures. Thermodynamic properties (entropy, enthalpy, and Gibbs free energy changes) were also calculated. The thermodynamic properties measured in this study were further applied to evaluate the appropriate precursors for fabricating Ca3(VO4)2 via solid‐state calcination. The results strongly recommend the use of V2O5 and Ca(OH)2 precursors for preparing the Ca3(VO4)2 samples because of their thermodynamic advantages.

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Section: Thermodynamic Propertiesmentioning

confidence: 99%

Section: Applications Of Thermodynamic Properties In Materials Fabric...mentioning

confidence: 99%

See 2 more Smart Citations

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

Pei,

Jiao,

et al. 2024

J Am Ceram Soc.

Self Cite

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“…According to our previous studies [25,28], the calculated Gibbs free energy (ΔG) values for Reactions (2)-( 5) are all below 0, indicating that the reactions were all thermodynamically favorable during the sintering temperatures. As known to all, the reaction with lower ΔG has higher priority [29].…”

Section: Preparation Of (B 4 C-tib 2 ) Precursor Powdersmentioning

confidence: 92%

Tuning mechanical and electrical performances of B ₄C–TiB ₂ ceramics in a two-step spark plasma sintering process

Zhao,

Zhang,

et al. 2024

Journal of Advanced Ceramics

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B 4 C-TiB 2 is an advanced electrically conductive ceramic with excellent mechanical and electrical discharge machinable properties. It is challenging and rewarding to achieve highly conductive and hard B 4 C-TiB 2 composites at a minimum content of conductive TiB 2 that has inferior hardness but double specific gravity of the B 4 C matrix. A novel strategy was used to construct conductive networks in B 4 C-15 vol% TiB 2 composite ceramics with B 4 C, TiC, and amorphous B as raw materials by a two-step spark plasma sintering method. The influences of particle size matching between B 4 C and TiC on the conducting of the strategy and the microstructure were discussed based on the selective matrix grain growth mechanism. The mechanical and electrical properties were also systematically investigated. The B 4 C-15 vol% TiB 2 composite ceramic prepared from 10.29 µm B 4 C and 0.05 µm TiC powders exhibited a perfect threedimensional interconnected conductive network with a maximum electrical conductivity of 4.25×10 4 S/m, together with excellent mechanical properties including flexural strength, Vickers hardness, and fracture toughness of 691±58 MPa, 30.30±0.61 GPa, and 5.75±0.32 MPa•m 1/2 , respectively, while the composite obtained from 3.12 µm B 4 C and 0.8 µm TiC powders had the best mechanical properties including flexural strength, Vickers hardness, and fracture toughness of 827±35 MPa, 32.01±0.51 GPa, and 6.45±0.22 MPa•m 1/2 , together with a decent electrical conductivity of 0.65×10 4 S/m.

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Phase transition and thermodynamic properties of CaV2O6 at high temperature

Pei

Jung

et al. 2023

Calphad

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Crystal structure, phase transitions, and thermodynamic properties of magnesium metavanadate (MgV2O6)

Cited by 4 publications

References 30 publications

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

Tuning mechanical and electrical performances of B ₄C–TiB ₂ ceramics in a two-step spark plasma sintering process

Phase transition and thermodynamic properties of CaV2O6 at high temperature

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Crystal structure, phase transitions, and thermodynamic properties of magnesium metavanadate (MgV2O6)

Cited by 4 publications

References 30 publications

High‐temperature phase transformation and thermodynamic properties of Ca3(VO4)2

High‐temperature phase transformation and thermodynamic properties of Ca3(VO4)2

Tuning mechanical and electrical performances of B 4C–TiB 2 ceramics in a two-step spark plasma sintering process

Phase transition and thermodynamic properties of CaV2O6 at high temperature

Contact Info

Product

Resources

About

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

Tuning mechanical and electrical performances of B ₄C–TiB ₂ ceramics in a two-step spark plasma sintering process