Sound velocity in the liquid GeSe system

Tsuchiya, Y.

doi:10.1016/0022-3093(90)91067-2

Cited by 19 publications

(13 citation statements)

References 16 publications

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“…(5b) then gives an isothermal compressibility, j T , of 0.46(3) · 10 À10 Pa À1 for liquid GeSe and 2.3(2) · 10 À10 Pa À1 for liquid GeSe 2 . By comparison, the measured adiabatic compressibility, j S , values are 0.94(2) · 10 À10 and 2.79(2) · 10 À10 Pa À1 for liquid GeSe and GeSe 2 , respectively [4]. The j T values obtained from the neutron diffraction data are, therefore, too small since it follows from thermodynamics that j T P j S .…”

Section: Low-k Limits Of the Partial Structure Factorsmentioning

confidence: 97%

“…(5b) owing to the lower temperature of the glass and its smaller compressibility. Using the ultrasonic results of Ota et al [115], the j S value for the glass is estimated to be 1/5th that of the liquid at 784°C [4].…”

Section: Low-k Limits Of the Partial Structure Factorsmentioning

confidence: 99%

“…Pure Ge, for instance, undergoes a semiconductor to metal transition on melting and, in the molten phase, the nature of the bonding can be changed from metallic to covalent by the addition of Se. For example, as the atomic fraction of Ge, c Ge , is increased from 0.33 to 0.5 at 750°C, the electrical conductivity of the liquid increases by approximately three orders of magnitude [1][2][3], the molar volume decreases by a factor of 1.24 [2], and the adiabatic compressibility decreases by a factor of 2.9 [4]. For the same change of composition at 900°C, the kinematic viscosity decreases by a factor of approximately two [2,5].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structure of liquids and glasses in the Ge–Se binary system

Salmon

2007

Journal of Non-Crystalline Solids

103

128

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Section: Low-k Limits Of the Partial Structure Factorsmentioning

confidence: 97%

Section: Low-k Limits Of the Partial Structure Factorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure of liquids and glasses in the Ge–Se binary system

Salmon

2007

Journal of Non-Crystalline Solids

103

128

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“…The value of K T obtained from the experimental data of C p [24] and K s [25] using eqs. (5a) and (5b) is also reported in Table 1 for comparison.…”

Section: Resultsmentioning

confidence: 99%

Collective Excitations and Thermodynamic Properties of Liquid Selenium: A Transition from Short Chain Polymer to Real Polymer System

Khetarpal

Bhandari

Saxena

1998

phys. stat. sol. (b)

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A study of collective excitations in liquid selenium has been done in terms of longitudinal and transverse phonon eigen-frequencies using two different routes, i.e., the theory of liquids as developed by Hubbard and Beeby and the theory of phonons in amorphous solids using a self-consistent method. Rao-Joarder's equation has been used to compute the interaction potential by employing neutron diffraction results of the structure factor. A good qualitative agreement is observed between dispersion curves obtained from these routes and the recently reported experimental and molecular dynamics results. Further, from the low wave-vector transfer region of the dispersion curves, longitudinal and transverse sound velocities are evaluated. Finally, some thermodynamical properties, viz., isothermal compressibility, adiabatic compressibility, Debye temperature and specific heat at constant pressure and volume are also calculated. The calculated results of these elastic and thermal properties are in good agreement with the available data.

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“…The preceding experiments on the molar volume [5] and sound velocity [6] suggest structural changes of a crossover type at high temperatures above 900 o C, however the maximum temperatures covered by these investigations were not high enough to definitely show the liquid-liquid crossover transition in liquid GeSe 2 .…”

Section: Introductionmentioning

confidence: 88%

Novel liquid-liquid transition in the liquid Se-GeSe system

Tsuchiya

2011

EPJ Web of Conferences

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Abstract. The sound velocity in the liquid Se-SeGe system under the saturated vapor pressure was measured at every 1 degree. A minimum in the sound velocity as a function of temperature has been observed for alloys with 12.5 to 45 at.% Ge, which suggests that the crossover liquid-liquid transition occurs in the liquid around GeSe 2 . In addition to the minimum, it has been found for alloys with 15 to 27.5 at.% Ge that the sound velocity decreases rather stepwise. The reproducibility has been checked for different samples with the same composition and for different ultrasonic transducers. The decrease occurs in a very narrow temperature interval, a few degrees, and shows hysteresis depending on thermal treatments. The position of this temperature region lowers with increasing Ge concentration, and appears to merge into a minimum in the sound velocity around GeSe 2 . Novel structural changes, being the first order in nature, occur slightly below the crossover transition.

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Sound velocity in the liquid GeSe system

Cited by 19 publications

References 16 publications

Structure of liquids and glasses in the Ge–Se binary system

Structure of liquids and glasses in the Ge–Se binary system

Collective Excitations and Thermodynamic Properties of Liquid Selenium: A Transition from Short Chain Polymer to Real Polymer System

Novel liquid-liquid transition in the liquid Se-GeSe system

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