Standard methods for heat capacity measurements on a Quantum Design Physical Property Measurement System

Rosen, Peter F.; Woodfield, Brian F.

doi:10.1016/j.jct.2019.105974

Cited by 32 publications

(12 citation statements)

References 369 publications

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“…24,25 Approximately 10 mg of each sample was encased in copper foil (0.025 mm thick, 99.999% purity, Alfa Aesar) along with two small copper coils included for enhanced thermal conductivity. 26 Each sample was then pressed into a pellet which was hermetically sealed in an aluminum differential scanning calorimetry (DSC) pan under vacuum according to a previously described method 27 to prevent water loss in the PPMS. Details can be found in Table S1.…”

Section: Materials Preparationmentioning

confidence: 99%

Role of Anions in Stabilizing the [Zn–Al] Layered Double Hydroxides: A Thermodynamic Study

et al. 2023

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Room-temperature acid solution calorimetry, high-temperature oxide melt solution calorimetry, and low-temperature heat capacity measurements were employed to calculate the thermodynamic stabilities of the [Zn–Al–X] layered double hydroxides (LDH) containing different anions (X = Cl–, CO3 2–, and SO4 2–). Cryogenic heat capacity measurements demonstrated a Schottky-type anomaly in the heat capacity of all three LDHs below 11 K. This anomaly is attributed to the tunneling of protons between adjacent oxygen atoms in the LDH interlayer as this creates an energy system similar to a two-level system modeled with a Schottky term. These heat capacity measurements were also used to determine vibrational entropies which, when combined with configurational entropies, provide standard entropies of these LDHs. Enthalpies of formation of LDHs from binary components were determined and combined with the entropies of formation to calculate Gibbs free energies. Based on these values, the order of stability is [Zn–Al–SO4] > [Zn–Al–CO3] > [Zn–Al–Cl]. This trend results from a combination of the interlayer spacing, amount of water in the interlayer, interactions among the interlayer species, and interactions between the metal hydroxide layer and the interlayer.

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Section: Materials Preparationmentioning

confidence: 99%

Role of Anions in Stabilizing the [Zn–Al] Layered Double Hydroxides: A Thermodynamic Study

et al. 2023

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“…In the high-temperature region, the contribution from lattice vibrations prevails, which is modeled herein using a combination of Debye and Einstein functions, as expressed in eq . where D (θ D ), E (θ E 1 ), E (θ E 2 ), and E (θ E 3 ) are the Debye and Einstein functions, respectively, as written in eqs and . θ D , θ E 1 , θ E 2 and θ E 3 are the characteristic Debye and Einstein temperatures.…”

Section: Resultsmentioning

confidence: 99%

“…In the high-temperature region, the contribution from lattice vibrations prevails, which is modeled herein using a combination of Debye and Einstein functions, 64 as expressed in eq 7.…”

Section: Standard Enthalpy Of Formation Determinationmentioning

confidence: 99%

Report of the Double-Molybdate Phase Cs₂Ba(MoO₄)₂ with a Palmierite Structure and Its Thermodynamic Characterization

et al. 2020

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The existence of a novel double-molybdate phase with a palmierite-type structure, Cs 2 Ba(MoO 4 ) 2 , is revealed in this work, and its structural properties at room temperature have been characterized in detail using X-ray and neutron diffraction measurements. In addition, its thermal stability and thermal expansion are investigated in the temperature range 298–673 K using high-temperature X-ray diffraction, leading to the volumetric thermal expansion coefficient α V ≈ 43.0 × 10 –6 K –1 . The compound’s standard enthalpy of formation at 298.15 K has been obtained using solution calorimetry, which yielded Δ f H m °(Cs 2 Ba(MoO 4 ) 2 , cr, 298.15 K) = −3066.6 ± 3.1 kJ· mol –1 , and its standard entropy at 298.15 K has been derived from low-temperature (2.1–294.3 K) thermal-relaxation calorimetry as S m °(Cs 2 Ba(MoO 4 ) 2 , cr, 298.15 K) = 381.2 ± 11.8 J K –1 mol –1 .

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“…The first measurement techniques is based on the Joule–Lenz (Equation (14)) [ 44 , 45 ] heat to the heat energy factor, which is emitted from the conductor of electrical energy (Equations (15) and (16)) [ 44 , 45 ], and voltages from Ohm’s law (Equation (17)) [ 44 , 45 ].

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Section: Methodsmentioning

confidence: 99%

Heat Transfer Analysis of 3D Printed Wax Injection Mold Used in Investment Casting

et al. 2022

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Investment casting is one of the precise casting methods where disposable wax patterns made in wax injection molds are used to make a casting mold. The production capacity of precision foundry is determined by the time taken for producing wax patterns, which depends on the time taken for wax solidification. Wax injection molds are usually made of aluminum or copper alloys with the use of expensive and time-consuming computer numerical control (CNC) processing, which makes low-volume production unprofitable. To reduce these costs, the authors present a heat transfer analysis of a 3D printed wax injection mold. Due to the low thermal conductivity of the photopolymer resin, the influence of different cooling channels’ shapes was investigated to improve the time of the manufacturing process. Transient thermal analysis was performed using COMSOL software based on the finite element method (FEM) and included a simulation of wax injection mold cooling with cold air (−23 °C), water, and without cooling. The analysis showed that use of cooling channels in the case of photopolymer material significantly reduces the solidification time of the sample (about 10 s shorter), and that under certain conditions, it is possible to obtain better cooling than obtained with the aluminum reference wax injection mold (after approximately 25–30 s). This approach allows to reduce the production costs of low-volume castings.

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Standard methods for heat capacity measurements on a Quantum Design Physical Property Measurement System

Cited by 32 publications

References 369 publications

Role of Anions in Stabilizing the [Zn–Al] Layered Double Hydroxides: A Thermodynamic Study

Role of Anions in Stabilizing the [Zn–Al] Layered Double Hydroxides: A Thermodynamic Study

Report of the Double-Molybdate Phase Cs₂Ba(MoO₄)₂ with a Palmierite Structure and Its Thermodynamic Characterization

Heat Transfer Analysis of 3D Printed Wax Injection Mold Used in Investment Casting

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Standard methods for heat capacity measurements on a Quantum Design Physical Property Measurement System

Cited by 32 publications

References 369 publications

Role of Anions in Stabilizing the [Zn–Al] Layered Double Hydroxides: A Thermodynamic Study

Role of Anions in Stabilizing the [Zn–Al] Layered Double Hydroxides: A Thermodynamic Study

Report of the Double-Molybdate Phase Cs2Ba(MoO4)2 with a Palmierite Structure and Its Thermodynamic Characterization

Heat Transfer Analysis of 3D Printed Wax Injection Mold Used in Investment Casting

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Product

Resources

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Report of the Double-Molybdate Phase Cs₂Ba(MoO₄)₂ with a Palmierite Structure and Its Thermodynamic Characterization