Structure of the intermediate phase of PbTe at high pressure

Rousse, Gwenaëlle; Klotz, Stefan; Saitta, A. Marco; Rodriguez-Carvajal, J.; McMahon, M. I.; Couzinet, B.; Mézouar, M.

doi:10.1103/physrevb.71.224116

Cited by 74 publications

(96 citation statements)

References 28 publications

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“…These results agree with the propositions about similarity of the intermediate high-pressure phases for lighter compounds PbS and PbSe, and its difference from the one of heavier compound PbTe [5,17]. The intermediate phases of PbS and PbSe were attributed to GeS structural type [5], and only recently the intermediate phase of PbTe was deciphered near P ~ 6 GPa to be an orthorhombic Pnma lattice [6].…”

Section: Introductionsupporting

confidence: 91%

“…1a) [6]. However, the peak intensities were not completely identical to the ones calculated for Pnma structural type.…”

Section: Resultscontrasting

confidence: 40%

“…However, the peak intensities were not completely identical to the ones calculated for Pnma structural type. The difference was small and might be explained by elastic strains in powdery sample [6]. Compressibility of Pb 1-x Mn x Te (x = 0.05) was found to be higher than in the others tellurides (Table 1).…”

Section: Resultsmentioning

confidence: 48%

“…Shifts in transition pressures P t of nonstoichiometrics compounds agreed with the thermopower data [13] confirming that excess of Pb decreases P t , while excess of Te increases that in comparison with stoichiometric binary PbTe. According to the thermopower data [13], the beginning of the phase transition in Pb 1-x Mn x Te (x = 0.05) was expected to occur at less pressure than in binary PbTe [6], but this divergence might by explained by a wide pressure step in synchrotron diffraction study (Fig. 1a).…”

Section: Resultsmentioning

confidence: 96%

“…Under pressure these minerals undergo the structural transitions from ambient fcc (face-centred-cubic) NaCl lattice (space group Fm3m) to an intermediate high-pressure phase above P ~ 2.5-6 GPa, and then above P ~ 12-21 GPa to the metal bcc (bodycentred-cubic) CsCl lattice [4]. The above transformations were already investigated by a set of different techniques, including structural X-ray diffraction [4][5][6], Raman scattering [7], the electrical resistance [8][9][10][11][12], thermopower [11][12][13], the Hall effect [14], and thermomagnetic Nernst-Ettigshausen effects [15,16]. Meanwhile, until present a lattice of the intermediate high-pressure phase was not exactly detected [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

High‐pressure X‐ray diffraction study of ternary and non‐stoichiometric PbTe and PbSe crystals

Ovsyannikov

Shchennikov

Manakov

et al. 2006

Physica Status Solidi (b)

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The paper reports the pressure-induced phase transitions observed in ternary PbTe and PbSe compounds (Pb 1-x Sn x Te, Pb 1-x Mn x Te, Pb 1-x Sn x Se) and non-stoichiometric PbTe ones (Pb 0.55 Te 0.45 , Pb 0.45 Te 0.55 ) at room temperature in the range of 0 to14 GPa by means of angle-dispersive X-ray diffraction (ADXRD). The structure of the intermediate high-pressure phase appearing above ~6 GPa for all PbTe-based compounds was established to be Pnma (orthorhombic), like in binary PbTe. The patterns of the intermediate highpressure phase of Pb 1-x Sn x Se (x = 0.125) were found to correspond entirely neither to GeS nor to orthorhombic Pnma, but the calculated reflections for GeS type were closer to the experimental ones. A model of the phase transformations is discussed.

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Section: Introductionsupporting

confidence: 91%

“…1a) [6]. However, the peak intensities were not completely identical to the ones calculated for Pnma structural type.…”

Section: Resultscontrasting

confidence: 40%

Section: Resultsmentioning

confidence: 48%

Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

High‐pressure X‐ray diffraction study of ternary and non‐stoichiometric PbTe and PbSe crystals

Ovsyannikov

Shchennikov

Manakov

et al. 2006

Physica Status Solidi (b)

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Unusual B1–B2 transition in PbSe under high pressure: evidence for two intermediate phases; transport, structural, and optical properties

Ovsyannikov¹,

Shchennikov²,

Manakov³

et al. 2009

Physica Status Solidi (b)

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We report the results of a study of the thermoelectric power (Seebeck effect), the electrical resistivity, X‐ray diffraction, and Raman spectroscopy under high pressure (P) to 15 GPa for binary and tin‐doped lead selenide (PbSe and Pb1–x Snx Se (x = 0.125)). The gathered data were inconsistent with previous models suggesting only one intermediate phase between the ambient NaCl (B1) lattice and a high‐pressure metal CsCl (B2) lattice. Furthermore, the data hint at the existence of two competing intermediate phases. From the thermopower we established that a phase that is characterized by n‐type conductivity is dominating, while the other one – of p‐type conductivity is probably optional. The electrical conductivity in both of the phases is semiconducting. In the X‐ray diffraction studies in one of the three investigated samples of Pb0.875Sn0.125Se we could refine a pattern of the intermediate phase taken at ∼9.5 GPa in the Cmcm space group. This corresponds to the symmetry of earlier proposed structural types of TlI and CrB. The patterns of the intermediate phase in the two other samples show additional strong reflexes that are not related to either the NaCl or the CsCl lattices. This presents evidence of the presence of one more undetermined phase. The Raman spectra of the intermediate phase showed a dependence on a pressure‐transmitting medium (methanol‐ethanol or KCl). The pressure‐driven NaCl → CsCl transition and a pressure dependence of the semiconductor energy gap of PbSe are compared with those of other lead salts, namely, PbTe and PbS (galena). It is surmised that there is no interrelation between the closure of the energy gap at the NaCl phase and the phase transition to the intermediate phase. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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A review on structural characteristics and thermoelectric properties of mid-temperature range Chalcogenide-based thermoelectric materials

Shankar,

Prabhu

2023

J Mater Sci

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Several affordable and pollution-free technologies have drawn a lot of attention because of the pressure of our energy needs and environmental problems; among these, thermoelectric technology has made enormous advances. It has been known that thermoelectric materials are efficient in transforming waste heat energy into electricity. The efficiency of thermoelectric materials is typically assessed using the ZT value, ZT = S2T/ρκ. Several methods have been highlighted in the literature for improving thermoelectric figure of merit. This review stands out for its particular emphasis on cutting-edge techniques that are leading to a new era of thermoelectric innovation, including doping, co-doping, alloying, nanostructuring, and nanocompositing. Our focus is on mid-temperature range thermoelectric materials, which operate between 500 and 900 K and have enormous potential for high-efficiency thermoelectricity and waste heat recovery due to their inherent thermal and electrical properties. This review provides a foundational understanding of thermoelectric concepts as well as obstacles to improving the figure of merit and the various classes of mid-temperature range thermoelectric materials, including their structure and thermoelectric characteristics are discussed in brief. Additionally, it also discusses different methods described in the various literature regarding enhancing performance as well as recent advancements made in this area and this article emphasizes the relevance and importance of these developments in the context of urgent global energy challenges and highlights the crucial role that mid-temperature range thermoelectric materials will play in determining the future landscape of sustainable energy sources. To satisfy the practical demand, scientific research in the field of thermoelectricity still needs to be intensified, for this mid-temperature range, Chalcogenide-based thermoelectric materials play a very important role in the future. Graphical abstract

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Structure of the intermediate phase of PbTe at high pressure

Cited by 74 publications

References 28 publications

High‐pressure X‐ray diffraction study of ternary and non‐stoichiometric PbTe and PbSe crystals

High‐pressure X‐ray diffraction study of ternary and non‐stoichiometric PbTe and PbSe crystals

Unusual B1–B2 transition in PbSe under high pressure: evidence for two intermediate phases; transport, structural, and optical properties

A review on structural characteristics and thermoelectric properties of mid-temperature range Chalcogenide-based thermoelectric materials

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