Thermodynamic study of the systems PrSe2.00–PrSe1.50 and GdSe1.875–GdSe1.50

Chusova, T. P.; Зеленина, Л. Н.; Vasilyeva, I.G.; Graf, Christian; Doert, Th.

doi:10.1016/j.jallcom.2006.12.162

Cited by 20 publications

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References 11 publications

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“…The mea surement accuracy was 1 Torr, 0.5 K, and 0.01 formula units for the pressure, temperature, and composition of the solid phase, respectively. 7 The studies were carried out in wide ranges of…”

Section: Methodsmentioning

confidence: 99%

Thermodynamic properties of titanium selenides with variable composition TiSe2-TiSe1.80

2011

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The thermodynamic investigation of the system TiSe 2 -TiSe 1.80 was carried out by the static method of vapor pressure measurements using the quartz membrane zero manometers in the temperature range from 713 to 1395 К. The analysis of the p Se -T-x dependences obtained showed that titanium diselenide formed a continuous solid solution. The enthalpies and entro pies of dissociation processes of TiSe x were derived from the experimental data. The standard enthalpies of formation, the absolute entropies, and the free Gibbs energies of formation of selenides belonging to the homogeneity region of TiSe 2 were estimated using literature data. The obtained set of thermodynamic characteristics may be used for the calculation of phase equilibria and for thermodynamic modeling in the system Ti-Se.Key words: titanium selenides, enthalpies and entropies of dissociation, static method of pressure measurement.Titanium diselenide is the initial compound for the synthesis of intercalated materials with the polaron type of charge carriers. Such materials possess a series of very unusual properties, for instance, metal-semiconductor transition with dielectrization on heating, 1 reversible disor dering of an impurity on cooling, 2 and equilibrium hetero geneities of electron concentration. 3 The behavior of mul ticomponent systems should be analyzed in order to de velop the technology of preparation of intercalated mate rials. This analysis can be performed using thermodynam ic modeling based on the comparative analysis of the be havior of the free Gibbs energy of components of the sys tem (Δ f G°) as a function of the external parameters. A basic drawback of the existing approaches is that they ignore nonstoichiometry of individual compounds in the systems considered. It is known for many materials that the change in the free energy within the homogeneity region is com parable with the energy of formation. Thus, consideration

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Section: Methodsmentioning

confidence: 99%

Thermodynamic properties of titanium selenides with variable composition TiSe2-TiSe1.80

2011

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“…But as far as LnSe 1.95 phase exists in the systems La-Se, Nd-Se [11] and Ce-Se, one more experiment was carried out for revealing this phase in the Pr-Se system. Data obtained together with data from [10] (figure 3a and b) prove the existence of PrSe 1.95 phase.…”

Section: Resultsmentioning

confidence: 57%

“…Monovariant three-phase regions (I-V) are located between these lines. One experiment with PrSe 2.0 was carried out to clarify our results obtained previously for the system PrSe 2 -PrSe 1.5 [10]. According to Chusova et al [10], the PrSe 2 -PrSe 1.5 system contained the following individual phases: PrSe 1.90 , PrSe 1.85 and PrSe 1.80 .…”

Section: Resultsmentioning

confidence: 70%

“…The composition of the condensed phases was calculated using the ideal gas equation and the equilibrium constants for the process Se n (g) = nSe(g) [19]. The formula for composition calculation was given in our previous paper [10].…”

Section: Methodsmentioning

confidence: 99%

“…Earlier we investigated the systems LnSe 2Àx -LnSe 1.5 (Ln = La, Nd, Pr, Gd) [10,11], where the intermediate individual phases LnSe 1.95 (Ln = La, Nd), LnSe 1.85 (Ln = La, Pr, Nd, Gd), LnSe 1.80 (Ln = La, Pr, Nd, Gd) and GdSe 1.71 were detected for the first time. The aim of this work is to obtain the reliable data on compositions and homogeneity regions of intermediate phases in the LnSe 2 -LnSe 1.5 (Ln = Ce, Pr) systems, calculate the thermodynamics of the dissociation processes and analyse the thermodynamic properties of light (La, Ce, Pr, Nd) rare-earth polyselenides as a function of the selenium content.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic investigation of the phase formation processes in the systems LnSe2–LnSe1.5 (Ln=La, Ce, Pr, Nd)

Зеленина

Chusova

Vasilyeva

2013

The Journal of Chemical Thermodynamics

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ChemInform Abstract: Thermodynamic Study of the Systems PrSe_2.00—PrSe_1.50 and GdSe_1.875—GdSe_1.50.

et al. 2008

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Equilibria E 4000Thermodynamic Study of the Systems PrSe2.00-PrSe1. 50 and GdSe1.875-GdSe1.50. -The total pressure over high-quality crystals of PrSe 2.00 and GdSe 1.875 is measured in the temperature range 675-1296 K. The p-T-x diagrams show that the regions between the boundary compositions PrSe2.00 and PrSe1.80, GdSe1.86 and GdSe1.77 which were previously described as non-stoichiometric, consist of discrete stoichiometric phases such as PrSe1.90, PrSe1.85, PrSe1.80, and GdSe1.85, GdSe1.80, GdSe1.71, respectively. The standard heats of formation and the absolute entropies are estimated for each polyselenide. -(CHUSOVA*, T. P.; ZELENINA, L. N.; VASILYEVA, I. G.; GRAF, C.; DOERT, T.; J. Alloys Compd. 452 (2008) 1-2, 94-98; Nikolaev Inst. Inorg. Chem., Sib. Branch, Russ. Acad. Sci., Novosibirsk 630090, Russia; Eng.) -W. Pewestorf 23-008

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Thermodynamic study of the systems PrSe2.00–PrSe1.50 and GdSe1.875–GdSe1.50

Cited by 20 publications

References 11 publications

Thermodynamic properties of titanium selenides with variable composition TiSe2-TiSe1.80

Thermodynamic properties of titanium selenides with variable composition TiSe2-TiSe1.80

Thermodynamic investigation of the phase formation processes in the systems LnSe2–LnSe1.5 (Ln=La, Ce, Pr, Nd)

ChemInform Abstract: Thermodynamic Study of the Systems PrSe_2.00—PrSe_1.50 and GdSe_1.875—GdSe_1.50.

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Thermodynamic study of the systems PrSe2.00–PrSe1.50 and GdSe1.875–GdSe1.50

Cited by 20 publications

References 11 publications

Thermodynamic properties of titanium selenides with variable composition TiSe2-TiSe1.80

Thermodynamic properties of titanium selenides with variable composition TiSe2-TiSe1.80

Thermodynamic investigation of the phase formation processes in the systems LnSe2–LnSe1.5 (Ln=La, Ce, Pr, Nd)

ChemInform Abstract: Thermodynamic Study of the Systems PrSe2.00—PrSe1.50 and GdSe1.875—GdSe1.50.

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ChemInform Abstract: Thermodynamic Study of the Systems PrSe_2.00—PrSe_1.50 and GdSe_1.875—GdSe_1.50.