Investigation of the R2Te3–M2Te–PbTe (R=Tb, Dy; M=Cu, Ag) systems at 770K

Марчук, О. В.; Daszkiewicz, Marek; Gulay, L. D.; Olekseyuk, I. D.; Pietraszko, A.

doi:10.1016/j.jallcom.2007.01.065

Cited by 7 publications

(1 citation statement)

References 11 publications

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“…12 A higher carrier concentration was observed by Lin et al for TmCuTe 2 crystallizing in a different crystal structure (DyCuTe 2 structure type) 13,14 from TmAgTe 2 , leading to relatively high zT of 0.81 at 745 K. 15 The substitution of Ag with Cu might lead to an increase in carrier concentration due to intrinsic defects generally found for copper chalcogenides (Cu 2Àx Y (Y ¼ S, Se, Te)). [16][17][18][19][20][21] Apart from copper vacancies, copper chalcogenides have attracted renewed attention mainly due to superionic Cu atoms with liquid-like mobility leading to extremely low thermal conductivity.…”

Section: Introductionmentioning

confidence: 93%

YCuTe₂: a member of a new class of thermoelectric materials with CuTe₄-based layered structure

et al. 2016

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Intrinsically doped samples of YCuTe 2 were prepared by solid state reaction of the elements. Based on the differential scanning calorimetry and the high temperature X-ray diffraction analyses, YCuTe 2 exhibits a first order phase transition at $440 K from a low-temperature-phase crystallizing in the space group P 3m1 to a high-temperature-phase in P 3. Above the phase transition temperature, partially ordered Cu atoms become completely disordered in the crystal structure. Small increases to the Cu content are observed to favour the formation of the high temperature phase. We find no indication of superionic Cu ions as for binary copper chalcogenides (e.g., Cu 2 Se or Cu 2 Te). All investigated samples exhibit very low thermal conductivities (as low as $0.5 W m À1 K À1 at 800 K) due to highly disordered Cu atoms. Electronic structure calculations are employed to better understand the high thermoelectric efficiency for YCuTe 2 .The maximum thermoelectric figure of merit, zT, is measured to be $0.75 at 780 K for Y 0.96 Cu 1.08 Te 2 , which is promising for mid-temperature thermoelectric applications.

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Section: Introductionmentioning

confidence: 93%

YCuTe₂: a member of a new class of thermoelectric materials with CuTe₄-based layered structure

et al. 2016

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ChemInform Abstract: Investigation of the Ln₂Te₃—M₂Te—PbTe (Ln: Tb, Dy; M: Cu, Ag) Systems at 770 K.

Марчук¹,

Daszkiewicz²,

Gulay³

et al. 2008

ChemInform

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Equilibria E 4000Investigation of the Ln2Te3-M2Te-PbTe (Ln: Tb, Dy; M: Cu, Ag) Systems at 770 K. -The title systems are characterized by powder XRD. The compounds TbCuTe2 and DyCuTe2 (space group P3, Z = 4), TbAgTe2 and DyAgTe2 (space group P421m, Z = 2, single crystal XRD), Ln7Cu3Te12 (space group R3m), LnCu5Te4, and the solid solutions Tb(2+x)/3Cu2-xTe2 (0 ≤ x ≤ 1), and Dy(2+x)/3Cu2-xTe2 (0 ≤ x ≤ 1) (space group P3) exist in the systems. The formation of quaternary compounds is not observed. -(MARCHUK, O. V.; DASZKIEWICZ, M.; GULAY*, L. D.; OLEKSEYUK, I. D.; PIETRASZKO, A.; J.

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Ternary and Quaternary Chalcogenides of Si, Ge, Sn, Pb, and In

Gulay

Daszkiewicz

2011

Handbook on the Physics and Chemistry of Rare Earths

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Investigation of the R2Te3–M2Te–PbTe (R=Tb, Dy; M=Cu, Ag) systems at 770K

Cited by 7 publications

References 11 publications

YCuTe₂: a member of a new class of thermoelectric materials with CuTe₄-based layered structure

YCuTe₂: a member of a new class of thermoelectric materials with CuTe₄-based layered structure

ChemInform Abstract: Investigation of the Ln₂Te₃—M₂Te—PbTe (Ln: Tb, Dy; M: Cu, Ag) Systems at 770 K.

Ternary and Quaternary Chalcogenides of Si, Ge, Sn, Pb, and In

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Investigation of the R2Te3–M2Te–PbTe (R=Tb, Dy; M=Cu, Ag) systems at 770K

Cited by 7 publications

References 11 publications

YCuTe2: a member of a new class of thermoelectric materials with CuTe4-based layered structure

YCuTe2: a member of a new class of thermoelectric materials with CuTe4-based layered structure

ChemInform Abstract: Investigation of the Ln2Te3—M2Te—PbTe (Ln: Tb, Dy; M: Cu, Ag) Systems at 770 K.

Ternary and Quaternary Chalcogenides of Si, Ge, Sn, Pb, and In

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YCuTe₂: a member of a new class of thermoelectric materials with CuTe₄-based layered structure

YCuTe₂: a member of a new class of thermoelectric materials with CuTe₄-based layered structure

ChemInform Abstract: Investigation of the Ln₂Te₃—M₂Te—PbTe (Ln: Tb, Dy; M: Cu, Ag) Systems at 770 K.