Low temperature heat capacity of AuAl2, AuGa2 and AuIn2

Rayne, J.A.

doi:10.1016/0031-9163(63)90629-2

Cited by 38 publications

(9 citation statements)

References 4 publications

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“…The bulk modulus estimated from the computed P-V relation is 103 GPa ͑126 GPa in case of LDA͒, which are in good agreement with the measured value of 111 GPa. Using these values of bulk modulus and equilbrium volumes, the estimated Debye temperature is 289 K ͑317 K in LDA͒ which is in good agreement with the experimental value of 297 K. 26 The high pressure phase for AuAl 2 can be indexed to an orthorhombic cell ͑A = 8.067 Å, B = 3.177 Å, C = 7.472 Å at 17 GPa , Table I͒. The pressure volume data up to 17 GPa is shown in Fig.…”

Section: Band Structure Calculationssupporting

confidence: 77%

High-pressure experimental and theoretical investigations on the fluorite structured compoundAuAl2

et al. 2005

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Diamond anvil cell ͑DAC͒ based resistance measurements are carried out in AuAl 2 to the pressures of about 25 GPa for the first time. The data indicate possibility of phase transition around 12 GPa. High pressure data obtained using Elettra synchrotron source confirm the transformation of AuAl 2 from ambient CaF 2 to orthorhombic phase. The high precision P-V data when transformed to universal equation of state does not show any deviation from linearity. The first principles electronic band structure calculations up to these pressures in the cubic phase do not reveal any change corroborating the experimental findings of nonobservation of electronic topological transition in this compound.

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Section: Band Structure Calculationssupporting

confidence: 77%

High-pressure experimental and theoretical investigations on the fluorite structured compoundAuAl2

et al. 2005

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“…(where mAu,maa are the atomic masses and qo(O/T) is the Debye function) we obtain an X-ray Debye temperature OM= 169 (3) K. This is considerably lower than the values OC= 192 (5) K and 200 (1) K obtained by Rayne (1963) from low-temperature heat capacity 1"635 0"006 1"614 0"9906 0"078 6 6 2 1"547 0"008 1"517 0"9913 0"088 measurements and Testardi (1970) from elastic moduli at 4.2 K. A direct comparison between these results is inappropriate. Unfortunately the heat capacity data extend over too small a range to enable us to determine the minus-second moment of the frequency distribution; we are therefore unable to compare our result with the associated Debye temperature O~ (Barron, Leadbetter, Morrison & Salter, 1966).…”

Section: Ko-t O/t + 14 ]mentioning

confidence: 42%

Neutron diffraction study of anharmonic thermal vibration in AuGa₂

Prager¹,

Harvey²

1975

Acta Cryst Sect A

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Anharmonic effects are observed in a room-temperature neutron diffraction study of the intermetallic fluorite compound AuGa2. The analysis is performed on the basis of a single anharmonic vibrational parameter in addition to the harmonic vibrational parameters. It yields the values ~tAu = 3"08 (0"11)X 10-12 erg A-2, Ctoa = 2"91 (0"08) x 10-22 erg A,-2 for the harmonic parameters and flGa = --2" 3 (1" 2) X 10-22 erg A, -3 for the cubic anharmonic parameter. The Debye temperature is determined to be O M= 169(3) K at 294 K. Neglect of the thermal diffuse scattering correction is found to introduce an error of ~ 10 % in the Debye-Waller factors obtained. Least-squares analyses using the Zachariasen and the Becker & Coppens extinction corrections are found to give equivalent results.

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“…2 The other observed differences concern the anomalous Knight shift of Ga in AuGa 2 compared to the normal behaviour of Al and In in the other two compounds 3 and the different thermoelectric behavior of AuGa 2 . 4 Also, the measurements of the electronic specific heat 5 and Hall coefficient 4 do not reveal any significant differences in these compounds. It is thus necessary to have detailed knowledge of the band structure for these compounds.…”

Section: Introductionmentioning

confidence: 89%

Electronic topological and structural transition inAuIn2under pressure

et al. 1998

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Electrical resistivity, thermoelectric power, and high-pressure x-ray-diffraction measurements are carried out to investigate the anomaly observed earlier in fusion data around 3 GPa in the intermetallic compound AuIn 2 . While the imaging plate high-pressure angle-dispersive data indicate a structural phase transition beyond 8 GPa, the thermoelectric power shows a peak around 2 GPa, indicating the occurrence of an electronically driven isostructural transition. The first-principles linearized muffin-tin orbital calculations reveal that this transition is brought about by interception of the Fermi level by the energy-band maximum. The Lifshitz nature of this transition is responsible for the anomaly in the high-pressure electrical and fusion data.

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Low temperature heat capacity of AuAl2, AuGa2 and AuIn2

Cited by 38 publications

References 4 publications

High-pressure experimental and theoretical investigations on the fluorite structured compoundAuAl2

High-pressure experimental and theoretical investigations on the fluorite structured compoundAuAl2

Neutron diffraction study of anharmonic thermal vibration in AuGa₂

Electronic topological and structural transition inAuIn2under pressure

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Low temperature heat capacity of AuAl2, AuGa2 and AuIn2

Cited by 38 publications

References 4 publications

High-pressure experimental and theoretical investigations on the fluorite structured compoundAuAl2

High-pressure experimental and theoretical investigations on the fluorite structured compoundAuAl2

Neutron diffraction study of anharmonic thermal vibration in AuGa2

Electronic topological and structural transition inAuIn2under pressure

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Neutron diffraction study of anharmonic thermal vibration in AuGa₂