Accurate heat capacity measurements on powdered samples using a Quantum Design physical property measurement system

Shi, Quan; Snow, Claine L.; Boerio‐Goates, Juliana; Woodfield, Brian F.

doi:10.1016/j.jct.2010.04.008

Cited by 129 publications

(52 citation statements)

References 26 publications

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“…The PPMS equipment 14 T-type (Quantum Design, USA) was used for the heat capacity measurements in the low temperature region [31][32][33][34][35]. The measurements were performed by the relaxation method [36] with fully automatic procedure under high vacuum (pressure ~10 -2 Pa) to avoid heat loss through the exchange gas.…”

Section: Methodsmentioning

confidence: 99%

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Leitner¹,

Sedmidubský²,

Svoboda³

2013

Applications of Calorimetry in a Wide Context - Differential Scanning Calorimetry, Isothermal Titration Calorimetry and Microca

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Section: Methodsmentioning

confidence: 99%

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Leitner¹,

Sedmidubský²,

Svoboda³

2013

Applications of Calorimetry in a Wide Context - Differential Scanning Calorimetry, Isothermal Titration Calorimetry and Microca

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“…The method is described in more detail elsewhere [41,42]. The method is described in more detail elsewhere [41,42].…”

Section: Calorimetric Measurementsmentioning

confidence: 99%

Heat capacity and thermodynamic functions of γ-Al2O3

Calvin

Asplund

Zhang

et al. 2017

The Journal of Chemical Thermodynamics

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Alumina (Al 2 O 3 ) can be synthesized with a variety of crystalline structures, each with unique physical properties. Although the corundum phase (α-Al 2 O 3 ) has been well studied, the other phases of alumina have had limited attention over the years. One of the low-density phases of alumina, γ-Al 2 O 3 , is important in a variety of technical applications, largely because of its large surface area, pore volume, and high thermal stability when compared to mesoporous silicas. The mesoporous structure of γ-Al 2 O 3 causes it to be hygroscopic, and samples that are calcined at different temperatures can have widely varying amounts of water adsorbed to their surfaces as well as subtle changes in structure. We have measured the constant pressure heat capacities of four γ-Al 2 O 3 samples that were calcined at (300, 600, 900, and 1100) °C and have the chemical formulas Al 2 O 3 ·1.540H 2 O, Al 2 O 3 ·0.811H 2 O, Al 2 O 3 ·0.537H 2 O, and Al 2 O 3 ·0.204H 2 O, respectively. Molar heat capacities were measured from 1.8 to 300 K using a Quantum Design Physical Property Measurement System (PPMS), and the data was fit to a sum of theoretical functions below 15 K, orthogonal polynomials from 10 K to 60 K, and a combination of Debye and Einstein functions above 50 K. These fits were then used to generate C p,m°, ∆ 0 T S m°, ∆ 0 T H m°, and Φ m° values at smoothed temperatures from 0 K to 300 K for all samples. The differences in the thermodynamic functions for the samples is attributed to the differing amounts of water adsorbed to the surfaces and the corresponding change in the strength of water interactions with the surface.

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“…Assuming an initial value of T B , Equations (3)(4)(5) are substituted into (6). If the value of the left-hand side of Equation (6) is not equal to that of the right-hand side, it implies that the assumed T B is not appropriate.…”

Section: Liquefaction Rate Through Theoretical Calculationmentioning

confidence: 99%

“…Liquid helium (LHe) has been widely used as a cryogenic refrigerant in small-and medium-sized cryogenic devices, such as magnetoencephalographys (MEG) and physical property measurement system (PPMS) [1][2][3]. These devices are very expensive to run due to boil-off of the LHe.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and optimization of small-scale helium liquefaction with multi-cryocoolers

Gong

et al. 2015

Cryogenics

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Accurate heat capacity measurements on powdered samples using a Quantum Design physical property measurement system

Cited by 129 publications

References 26 publications

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Calorimetric Determination of Heat Capacity, Entropy and Enthalpy of Mixed Oxides in the System CaO–SrO–Bi2O3–Nb2O5–Ta2O5

Heat capacity and thermodynamic functions of γ-Al2O3

Experimental investigation and optimization of small-scale helium liquefaction with multi-cryocoolers

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