Calorimetric investigations of liquid Ge-Te and Si-Te alloys

Schlieper, A.; Blachnik, R.

doi:10.1016/0925-8388(95)02032-2

Cited by 18 publications

(5 citation statements)

References 13 publications

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“…For GeTe, the standard formation enthalpy is only accessible for T = 1213 K; besides, a strong dependence of f H 0 (GeTe) on temperature was observed [16]. To transform the given value for GeTe to the temperature region of the f H E (x Te = 0.5) data, we used the temperature dependence as given by Bergman and Castanet [17].…”

Section: Liquid Systemsmentioning

confidence: 99%

“…To transform the given value for GeTe to the temperature region of the f H E (x Te = 0.5) data, we used the temperature dependence as given by Bergman and Castanet [17]. Thus, we calculated f H 0 (GeTe) = −10.95 kJ mol −1 at T = 1153 K for the system GeTe-SnTe and f H 0 (GeTe) = −10.0 kJ mol −1 at T = 1213 K for the system PbTe-GeTe [16].…”

Section: Liquid Systemsmentioning

confidence: 99%

See 1 more Smart Citation

Comprehensive thermodynamic description of the quasiternary system PbTe–GeTe–SnTe

Yashina¹,

Leute²,

Shtanov³

et al. 2006

Journal of Alloys and Compounds

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Section: Liquid Systemsmentioning

confidence: 99%

Section: Liquid Systemsmentioning

confidence: 99%

Comprehensive thermodynamic description of the quasiternary system PbTe–GeTe–SnTe

Yashina¹,

Leute²,

Shtanov³

et al. 2006

Journal of Alloys and Compounds

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“…Neutron diffraction measurements by Neumann et al f271 show a strong decrease of the distance between nearest neighbors and the coordination number between 823 and 653 K. This is explained by the presence of associates with the stoichiometry GeTe and twofold bonded pure tellurium atoms. The result of recent calorimetric measurements of A H ( x , T ) [28] could be described quantitatively using the association model assuming the formation of GeTe associates. The ACp(T) of Ge15Tes5, which can be obtained from the measured of L w ( x , T ) in the temperature range 973-1213 K amounts to 5-10 J mol-' K-' in agreement with values which can be extrapolated from the data shown in Fig.…”

Section: Glstes5mentioning

confidence: 99%

Heat capacity of liquid eutectic tellurium alloys

Schmid

Sommer

1998

Ber Bunsenges Phys Chem

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Using an adiabatic calorimeter direct measurements of the heat capacity of the liquid Si15Te85, Ge15Te85, Sn15Te85, Pb11Te89, Pb11Te89 and Bi10Te90 alloys and of liquid tellurium have been performed. The heat capacity has been measured as a function of temperature up to about 100 K above the eutectic temperature. The heat capacity decreases with increasing temperature. The excess heat capacity ΔCp of Sn15Te85, Pb11Te89 and Bi10Te90 is pnearly constant within the examined temperature range and is smaller than 5 J mol−1 K−1. ΔCp of Sb11Te89 slightly depends on temperature, while ΔCp of Si15Te85 and Ge15Te85 exhibit large values and temperature dependences. ΔCp reflects the chemical short range order (CSRO) in the liquid state due to the strong compound forming tendency in these alloys. The influence of CSRO is discussed in the light of the measured ΔCp and other structure sensitive properties given in literature.

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“…However, only laser or electrical pulses allow for the high cooling rates necessary for quenching of the GeTe melt and, thus, re-amorphization. The melting temperature of GeTe is T M ¼ 723 C. 6 The strong property contrast between the non-volatile phases can be exploited for optical data storage and memristive memories. 7,8 The latter are one of the most promising candidates for neuromorphic computing.…”

Section: Introductionmentioning

confidence: 99%

Phase transitions in germanium telluride nanoparticle phase-change materials studied by temperature-resolved x-ray diffraction

Michel

Donat

Siegfried

et al. 2021

Journal of Applied Physics

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Germanium telluride (GeTe), a phase-change material, is known to exhibit four different structural states: three at room-temperature (one amorphous and two crystalline, α and γ) and one at high temperature (crystalline, β). Because transitions between the amorphous and crystalline states lead to significant changes in material properties (e.g., refractive index and resistivity), GeTe has been investigated as a phase-change material for photonics, thermoelectrics, ferroelectrics, and spintronics. Consequently, the temperature-dependent phase transitions in GeTe have been studied for bulk and thin-film GeTe, both fabricated by sputtering. Colloidal synthesis of nanoparticles offers a more flexible fabrication approach for amorphous and crystalline GeTe. These nanoparticles are known to exhibit size-dependent properties, such as an increased crystallization temperature for the amorphous-to-α transition in sub-10 nm GeTe particles. The α-to-β phase transition is also expected to vary with size, but this effect has not yet been investigated for GeTe. Here, we report time-resolved x-ray diffraction of GeTe nanoparticles with different diameters and from different synthetic protocols. We observe a non-volatile amorphous-to-α transition between 210 C and 240 C and a volatile α-to-β transition between 370 C and 420 C. The latter transition was reversible and repeatable. While the transition temperatures are shifted relative to the values known for bulk GeTe, the nanoparticle-based samples still exhibit the same structural phases reported for sputtered GeTe. Thus, colloidal GeTe maintains the same general phase behavior as bulk GeTe while allowing for more flexible and accessible fabrication. Therefore, nanoparticle-based GeTe films show great potential for applications such as in active photonics.

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Calorimetric investigations of liquid Ge-Te and Si-Te alloys

Cited by 18 publications

References 13 publications

Comprehensive thermodynamic description of the quasiternary system PbTe–GeTe–SnTe

Comprehensive thermodynamic description of the quasiternary system PbTe–GeTe–SnTe

Heat capacity of liquid eutectic tellurium alloys

Phase transitions in germanium telluride nanoparticle phase-change materials studied by temperature-resolved x-ray diffraction

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