Electrical Properties of Liquid Te–Se Mixtures at High Temperatures and High Pressures

Yao, Makoto; Misonou, Masao; Tamura, Kouichi; Ishida, K.; Tsuji, Kazuhiko; Endo, Hidenori

doi:10.1143/jpsj.48.109

Cited by 36 publications

(7 citation statements)

References 9 publications

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“…First, anomalous sound attenuation becomes small and weakly dependent on frequency around 1000°C [7,8]. Secondly, the electrical conductivity at 100 MPa reaches as large as 10 3 X À1 cm À1 around 1000°C and seems saturated [13]; the liquid is thought to be purely metallic. Finally, m S begins to decrease slowly with temperature above 1035°C.…”

Section: Discussionmentioning

confidence: 99%

Precise sound velocity measurement for liquid Se50Te50 under high pressure

Kajikawa

Kobayashi

Hiejima

et al. 2007

Journal of Non-Crystalline Solids

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Section: Discussionmentioning

confidence: 99%

Precise sound velocity measurement for liquid Se50Te50 under high pressure

Kajikawa

Kobayashi

Hiejima

et al. 2007

Journal of Non-Crystalline Solids

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“…In liquid Te-Se mixtures the semiconductor-to-metal (S-M) transition occurs in relatively narrow temperature range, which moves to higher temperatures with increasing Se concentration [4,14]. The S-M transition is accompanied by a structural change from an Se-like loosely packed structure to a Te-like densely packed structure [15][16][17], and it was recognized as an example where the liquid-liquid phase transition is blurred due to fluctuations [18].…”

Section: Introductionmentioning

confidence: 99%

Anomalous sound attenuation in liquid Te₅₀Se₅₀mixture under high pressure

Yao¹,

Kohno

Itokawa

et al. 2000

J. Phys.: Condens. Matter

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The sound velocity, v, and the sound attenuation coefficient, α, have been measured for liquid Te50Se50 mixture at 20, 32 and 43 MHz in the temperature and pressure range up to 1000 °C and 150 MPa. Near the melting point α decreases with increasing temperature, as is expected from the temperature variation of shear viscosity. In addition to the normal behaviour, we have found two peaks of α in the temperature range where the semiconductor-to-metal transition is observed. One is the high temperature peak, which appears around 850 °C irrespective of the frequency, and the other is the low temperature peak, whose position depends strongly on the frequency. The peaks become more prominent with increasing pressure, indicating the importance of the inter-chain couplings. Assuming a Debye-type relaxation for the frequency-dependent adiabatic compressibility, we have estimated the relaxation time to be about 7 ns from the high temperature peak.

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“…The SM-M transition (threshold conductivity is around 100 / cm) is located in the middle of density maximum and minimum. These properties are also observed in the highpressure region 9,10,11 . In Se50Te50, as the pressure increases, the transition temperature gradually decreases from about 650 C at ambient pressure to about 450 C at 500MPa 10 .…”

Section: Introductionmentioning

confidence: 55%

Static and dynamical inhomogeneity at liquid - liquid phase transition of Se-Te mixtures

Kajihara

Inui

Matsuda

et al. 2011

EPJ Web of Conferences

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Abstract.We have carried out x-ray transmission and small-angle x-ray scattering (SAXS) measurements of liquid Se70-Te30 mixture up to 1000 C and 100MPa and inelastic x-ray scattering (IXS) measurement of liquid Se50-Te50 mixture at SPring-8 in Japan. In this paper, we report the preliminary results. In liquid Se70-Te30 at 6MPa, with increasing temperature from 400 C, the density first normaly decreases but anomalously increases from 650 C. This anomalous density behaviour can be interpreted that the sample exhibits continuous transition from low-density phase to high-density one in this temperature region. As a proof of that, the zero-wavenumber-limit of SAXS intensity I(0) increases and shows maximum in this region, which means that the static density inhomogeneity arises due to phase transition. When the pressure is elevated, the density and I(0) curves shift to lower temperature side. The velocity of acoustic mode in Se50-Te50 estimated by IXS data is much higher than the ultrasonic sound velocity (so-called "fast sound" state) and the temperature dependences of the two velocities are totally different. But the ratio of the two velocities, the strength of "fast sound", seems to increase with approaching to the transition region and thus it seems to be a good sign of dynamical inhomogeneity.

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Electrical Properties of Liquid Te–Se Mixtures at High Temperatures and High Pressures

Cited by 36 publications

References 9 publications

Precise sound velocity measurement for liquid Se50Te50 under high pressure

Precise sound velocity measurement for liquid Se50Te50 under high pressure

Anomalous sound attenuation in liquid Te₅₀Se₅₀mixture under high pressure

Static and dynamical inhomogeneity at liquid - liquid phase transition of Se-Te mixtures

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Electrical Properties of Liquid Te–Se Mixtures at High Temperatures and High Pressures

Cited by 36 publications

References 9 publications

Precise sound velocity measurement for liquid Se50Te50 under high pressure

Precise sound velocity measurement for liquid Se50Te50 under high pressure

Anomalous sound attenuation in liquid Te50Se50mixture under high pressure

Static and dynamical inhomogeneity at liquid - liquid phase transition of Se-Te mixtures

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Product

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Anomalous sound attenuation in liquid Te₅₀Se₅₀mixture under high pressure