X-ray photoelectron spectroscopy studies of Yb14MnSb11 and Yb14ZnSb11

Holm, Aaron P.; Ozawa, Tadashi C.; Kauzlarich, Susan M.; Morton, Simon A.; Waddill, G. D.; Tobin, J. G.

doi:10.1016/j.jssc.2004.07.009

Cited by 61 publications

(70 citation statements)

References 17 publications

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“…The Mn 2þ description is consistent with the Hall effect, theoretical calculations, [9] XPS, [8] X-ray magnetic circular dichroism (XMCD), [10] doping studies, [11] and optical studies. [12] The hole is delocalized in its ground state, as indicated from the decreasing resistivity and Seebeck coefficient with decreasing temperature (300 to 4 K [7,13] ).…”

Section: Introductionsupporting

confidence: 75%

“…[2,3] Yb 14 MnSb 11 is one member of the chemically rich system of compounds with the Ca 14 AlSb 11 structure type. [4][5][6][7][8][9] In this versatile structure type, all components may be substituted and the compounds reported to date exhibit surprisingly unusual properties including Kondo effects and magnetoresistance. In terms of classical thermoelectric materials, Yb 14 MnSb 11 meets all the prerequisites for an optimal zT: it has a complex structure of heavy elements and it is a heavily doped semiconductor with low electrical resistivity, a large effective mass, and a low carrier concentration ($1.3 Â 10 21 cm À3 ).…”

Section: Introductionmentioning

confidence: 99%

“…In terms of classical thermoelectric materials, Yb 14 MnSb 11 meets all the prerequisites for an optimal zT: it has a complex structure of heavy elements and it is a heavily doped semiconductor with low electrical resistivity, a large effective mass, and a low carrier concentration ($1.3 Â 10 21 cm À3 ). [6][7][8] The unit cell of A 14 MPn 11 contains 208 atoms and is built up from isolated covalently bonded anions of [MPn 4 ] 9À tetrahedra, and [Pn 3 ] 7À linear units, along with Pn 3À anions, and A 2þ cations (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb₁₄Mn_1−xAl_xSb₁₁

Toberer

Cox

Brown

et al. 2008

Adv Funct Materials

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302

277

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For high temperature thermoelectric applications, Yb14MnSb11 has a maximum thermoelectric figure of merit (zT) of ∼1.0 at 1273 K. Such a high zT is found despite a carrier concentration that is higher than typical thermoelectric materials. Here, we reduce the carrier concentration with the discovery of a continuous transition between metallic Yb14MnSb11 and semiconducting Yb14AlSb11. Yb14Mn1‐xAlxSb11 forms a solid solution where the free carrier concentration gradually changes as expected from the Zintl valence formalism. Throughout this transition the electronic properties are found to obey a rigid band model with a band gap of 0.5 eV and an effective mass of 3 me. As the carrier concentration decreases, an increase in the Seebeck coefficient is observed at the expense of an increased electrical resistivity. At the optimum carrier concentration, a maximum zT of 1.3 at 1223 K is obtained, which is more than twice that of the state‐of‐the‐art Si0.8Ge0.2 flown by NASA.

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Section: Introductionsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb₁₄Mn_1−xAl_xSb₁₁

Toberer

Cox

Brown

et al. 2008

Adv Funct Materials

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302

277

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“…It is thus reasonable to assume they are related to the Yb. Previous studies 12,13 of Yb-containing Zintl materials suggest that the additional features that appear from −6 to −12 eV are due to Yb 3+ valence, contradicting the expectation that Yb valence should be purely Yb 2+ in these compounds. In Fig.…”

Section: Yb Valencementioning

confidence: 80%

“…A previous Zintl study 12 proposed inherent Yb 3+ in the Yb 14 ZnSb 11 but not in the Yb 14 MnSb 11 compound. They claimed that the Yb 3+ signal was significantly enhanced in the Zn-containing compound.…”

Section: Yb Valencementioning

confidence: 86%

Valence band study of thermoelectric Zintl-phaseSrZn2Sb2andYbZn2<

et al. 2010

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The electronic structure of SrZn 2 Sb 2 and YbZn 2 Sb 2 is investigated using density functional theory and high-resolution x-ray photoemission spectroscopy. Both traditional Perdew-Burke-Ernzerhof and state-of-theart hybrid Heyd-Scuseria-Ernzerhof functionals have been employed to highlight the importance of proper treatment of exchange-dependent Zn 3d states, Yb 4f states, and band gaps. The role of spin-orbit corrections in light of first-principles transport calculations are discussed and previous claims of Yb 3+ valence are investigated with the assistance of photoelectron as well as scanning and transmission electron microscopy.

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Zintl Compounds

Janka

Kauzlarich

2021

Encyclopedia of Inorganic and Bioinorganic Chemistry

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The term “Zintl phase” refers to a class of compounds and is used to recognize contributions to the field of solid‐state inorganic chemistry by Eduard Zintl. Zintl phases were initially defined as a subgroup of intermetallic phases, where the anions or anionic network could be considered formally to be valence satisfied. In the historical description, these compounds are formed from electropositive elements from groups 1, 2 that, in a formal sense, donate their electrons to the electronegative elements from groups 13, 14, and 15, which use them to form the correct number of bonds such that each element has a filled shell (Zintl–Klemm–Busmann concept). The initial definition has been expanded from the binary phases to include ternary phases and further enlarged to include transition metals and rare earth elements in some cases. The compounds that make up this class are described along with the corresponding Zintl anions arising from solution chemistry. Recent results in the field such as their application as nonlinear optical materials, topological insulators, thermoelectrics, and as precursors for novel materials are also described.

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X-ray photoelectron spectroscopy studies of Yb14MnSb11 and Yb14ZnSb11

Cited by 61 publications

References 17 publications

Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb₁₄Mn_1−xAl_xSb₁₁

Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb₁₄Mn_1−xAl_xSb₁₁

Valence band study of thermoelectric Zintl-phaseSrZn2Sb2andYbZn2<

Zintl Compounds

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X-ray photoelectron spectroscopy studies of Yb14MnSb11 and Yb14ZnSb11

Cited by 61 publications

References 17 publications

Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb14Mn1−xAlxSb11

Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb14Mn1−xAlxSb11

Valence band study of thermoelectric Zintl-phaseSrZn2Sb2andYbZn2<

Zintl Compounds

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Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb₁₄Mn_1−xAl_xSb₁₁

Traversing the Metal‐Insulator Transition in a Zintl Phase: Rational Enhancement of Thermoelectric Efficiency in Yb₁₄Mn_1−xAl_xSb₁₁