High-temperature heat capacity and phase transformation kinetics of NaVO3

Pei, Guishang; Xiang, Junyi; Lv, Xuewei; Li, Gang; Wu, Shanshan; Zhong, Dapeng; Lv, Wei

doi:10.1016/j.jallcom.2019.04.186

Cited by 24 publications

(10 citation statements)

References 14 publications

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“…Therefore, two heating cycles were taken, and the second cycle during the heating process was used in this study. The maximum uncertainties on the instrument of temperature measurements were equal to ±1 K and enthalpy change ±2.0%, which was calibrated using standard materials, such as aluminum, zinc, tin and indium, silver, nickel, respectively 24–26 …”

Section: Methodsmentioning

confidence: 99%

“…The maximum uncertainties on the instrument of temperature measurements were equal to ±1 K and enthalpy change ±2.0%, which was calibrated using standard materials, such as aluminum, zinc, tin and indium, silver, nickel, respectively. [24][25][26] The molar heat capacity of Ca 5 Mg 4 V 6 O 24 sample at high temperature was measured using a classic "three steps" method based on the DSC technique (NETZSCH STA 404 F3 Pegasus). Measurements were operated in a dynamic model with a heating rate of 10 K min −1 in the argon atmosphere (99.998%, 50 ml min −1 ), and the isothermal intervals of 15 and 10 min before and after the dynamic temperature profile were designed to stabilize the heat flow curve, respectively.…”

Section: Thermodynamic Property Measurementsmentioning

confidence: 99%

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The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

et al. 2022

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A Ca5Mg4V6O24 compound was synthesized through solid‐state roasting routes under an air atmosphere, and its crystal structure and thermodynamic properties were determined using various methods. The cell parameters of Ca5Mg4V6O24 indicate that it crystallizes in cubic space group Ia3d with the unit cell parameters a = 12.442 ± 0.001 Å. X‐ray photoelectron spectroscopy also confirmed that the vanadium element in the Ca5Mg4V6O24 sample is present in the +5 state. The melting of Ca5Mg4V6O24 was detected at 1442 K. The molar heat capacity (374 J mol K−1) and entropy (688.2 J mol K−1) of Ca5Mg4V6O24 at 298.15 K were determined using physical properties measurement system, and simultaneous thermal analyzer for the first time. The solubility of Ca5Mg4V6O24 in water at different temperatures was measured and its dissolution behavior in sulfuric acid and kinetics was experimentally established.

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Section: Methodsmentioning

confidence: 99%

Section: Thermodynamic Property Measurementsmentioning

confidence: 99%

The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

et al. 2022

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“…High‐temperature heat capacity of Na 2 Ti 3 O 7 was measured from 573 to 1323 K by an MHTC 96 line (SETARAM, France) with drop mode. The basic principle and equipment of MHTC 96 line are described in detail elsewhere 16 . High‐temperature heat capacity was subsequently calculated from the differential of the average enthalpy changes at different temperature.…”

Section: Materials and Experimentsmentioning

confidence: 99%

Thermodynamic properties of sodium trititanate (Na₂Ti₃O₇) at high temperature (298.15‐1403 K)

et al. 2021

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Sodium‐ion batteries (NaIBs) have attracted extraordinary attentions as a promising scalable energy storage alternative to current lithium‐ion batteries (LIBs), owing to their natural abundance and low costs. Sodium trititanate (Na2Ti3O7) is a promising material as the material of NaIBs with low potential and high theoretical capacitance. In order to better understand their service performance when utilized in rechargeable NaIBs, studies on thermodynamic properties of Na2Ti3O7 are indispensable. However, an extensive literature review revealed that the heat capacity of Na2Ti3O7 is established with divergences, especially for high‐temperature region. Therefore, the 99.5% purity of Na2Ti3O7 powder was first Synthesized through solid‐state reaction with sodium carbonate (Na2CO3) and titanium dioxide (TiO2) as raw materials. The as‐prepared samples were used to measure the heat capacity from 573 to 1323 K which was carried out with multihigh temperature calorimeter (MHTC) 96 line. The temperature dependence of heat capacity was modeled as a function: Cp =255.51073 + 0.06059 T − 3.86912 × 106 T−2 (J mol−1 K−1) (298.15 ‐ 1403 K), and then used for computing changes in enthalpy, entropy, and Gibbs free energy. Heat capacity of Na2Ti3O7 from 0 to 1403 K was given for future application of Na2Ti3O7 in rechargeable batteries.

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“…The basic principles and equipment details are described in our previous study. 47 Cylindrical pellets 2 mm in height and 4 mm in diameter were prepared using a hydraulic press (∼6 MPa). The mass of the AT samples ranged from 80 to 105 mg, which was comparable to that of the standard reference materials (sapphire α-Al 2 O 3 , 99.999%).…”

Section: Reduction Performancementioning

confidence: 99%

Andradite titanium: Preparation, characterization and metallurgical performance

Chen

You

et al. 2021

J Am Ceram Soc.

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Andradite titanium (Ca 3 Fe 2 Si 1.58 Ti 1.42 O 12 , abbreviated as AT), which is a significant mineral phase in the sinter of titanium-containing iron ore, was prepared via a solid-state reaction with analytical reagents. The crystal structure, cold strength, and high-temperature heat capacity were individually characterized, and the metallurgical performance, such as melting and reduction behavior, were measured. AT is a variant of andradite (Ca 3 Fe 2 Si 3 O 12 ) formed by the Ti 4+ substitution for Fe 3+ in the octahedral sites and Fe 3+ substitution for Si 4+ in the tetrahedral sites. The compressive strength of AT was approximately 14.21 MPa, and its softening, melting, and flowing temperatures were 1453, 1483, and 1509 K, respectively. According to the differential scanning calorimetry measurements, the melting point was approximately 1502 K. The non-isothermal reduction results revealed that AT was reduced to Fe, perovskite, and wollastonite in a single step, and the isothermal reduction test indicated that the reduction degree of AT was only 0.67 when reduced at 900 • C for 150 min, and the order of reduction performance was FeThe hightemperature heat capacity of AT as a function of temperature was also measured and modeled.

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High-temperature heat capacity and phase transformation kinetics of NaVO3

Cited by 24 publications

References 14 publications

The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

Thermodynamic properties of sodium trititanate (Na₂Ti₃O₇) at high temperature (298.15‐1403 K)

Andradite titanium: Preparation, characterization and metallurgical performance

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High-temperature heat capacity and phase transformation kinetics of NaVO3

Cited by 24 publications

References 14 publications

The phase structure, thermodynamic properties, and dissolution behavior of Ca5Mg4V6O24

The phase structure, thermodynamic properties, and dissolution behavior of Ca5Mg4V6O24

Thermodynamic properties of sodium trititanate (Na2Ti3O7) at high temperature (298.15‐1403 K)

Andradite titanium: Preparation, characterization and metallurgical performance

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The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

The phase structure, thermodynamic properties, and dissolution behavior of Ca₅Mg₄V₆O₂₄

Thermodynamic properties of sodium trititanate (Na₂Ti₃O₇) at high temperature (298.15‐1403 K)