Pressure-Dependent Thermal Expansion Coefficient by a Diamond Anvil Cell

Yan, Jinyuan; Yang, Shizhong

doi:10.1007/s10765-021-02945-3

Cited by 2 publications

(3 citation statements)

References 31 publications

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“…Pressure dependent thermal expansion is the thermal expansion process in an isobaric heating process. In reference [39], Yan and Yang proposed a revertible heating/cooling process to measure pressure dependent thermal expansion coefficient by a diamond anvil cell experimentally, when a diamond anvil cell is equipped with a membrane. In a revertible heating/cooling technique, an isobaric process was justified as the heating data and cooling data are revertible, and no pressure determination at high P-T during heating is required, and thus it eliminates the pressure measuring issue at high P-T conditions.…”

Section: Thermal Expansion Model At High P-t Conditionsmentioning

confidence: 99%

Thermal Pressure in the Thermal Equation of State for Solid and a Proposed Substitute

Yan

Yang

2022

Int J Thermophys

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The thermal equation of state (TEOS) for solids is a mathematic model among pressure, temperature and density, and is essential for geophysical, geochemical, and other high pressure–temperature (high P–T) researches. However, in the last few decades, there has been a growing concern about the accuracy of the pressure scales of the calibrants, and efforts have been made to improve it by either introducing a reference standard or building new thermal pressure models. The existing thermal equation of state, P(V, T) = P(V, T0) + Pth(V, T), consists of an isothermal compression and an isochoric heating, while the thermal pressure is the pressure change in the isochoric heating. In this paper, we demonstrate that, for solids in a soft pressure medium in a diamond anvil cell, the thermal pressure can neither be determined from a single heating process, nor from the thermal pressure of its calibrant. To avoid the thermal pressure, we propose to replace the thermal pressure with a well-known thermal expansion model, and integrate it with the isothermal compression model to yields a Birch–Murnaghan-expansion TEOS model, called VPT TEOS. The predicted pressure of MgO and Au at ambient pressure from Birch–Murnaghan-expansion VPT TEOS model matches the experimental pressure of zero (0) GPa very well, while the pressure prediction from the approximated Anderson PVT TEOS exhibit a big deviation and a wrong trend.

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Section: Thermal Expansion Model At High P-t Conditionsmentioning

confidence: 99%

Thermal Pressure in the Thermal Equation of State for Solid and a Proposed Substitute

Yan

Yang

2022

Int J Thermophys

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“…According the demonstration in this paper, under the assumption of the pressure independent thermal expansion, the product of α p •K T will be automatically converted to α 0 •K 0 . However, in paper [5], it is experimentally proved that pressure prediction from α 0 •K 0 approximation exhibit a big deviation and a wrong trend by the Au and MgO at ambient pressure.…”

Section: The Reduced Pressurementioning

confidence: 96%

“…In paper [5], an alternate thermal expansion model was proposed to replace the thermal pressure model.…”

Section: The Reduced Pressurementioning

confidence: 99%

Pressure-independent thermal expansion and temperature-dependent bulk modulus

Yan

2023

Preprint

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Both pressure-dependent thermal expansion and temperature-dependent bulk modulus are two essential thermal physical coefficients for high pressure temperature research. Negative temperature dependent bulk modulus were reported under the assumption of pressure independent thermal expansion. In this paper, it is proved that any pressure independent thermal pressure yields zero temperature dependent bulk modulus, instead of a negative.

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Pressure-Dependent Thermal Expansion Coefficient by a Diamond Anvil Cell

Cited by 2 publications

References 31 publications

Thermal Pressure in the Thermal Equation of State for Solid and a Proposed Substitute

Thermal Pressure in the Thermal Equation of State for Solid and a Proposed Substitute

Pressure-independent thermal expansion and temperature-dependent bulk modulus

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