Structure and properties of the transition-metal Zintl compounds A14MnPn11 (A = Ca, Sr, Ba; Pn = As, Sb)

Rehr, A.; Kuromoto, Traci Y.; Kauzlarich, Susan M.; Castillo, J. Del; Webb, David J.

doi:10.1021/cm00037a020

Cited by 92 publications

(164 citation statements)

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“…[7] There is also a substantial distortion of the AlSb 4 tetrahedra in the isostructural compound Ca 14 AlSb 11 implying that steric effects cause distortions even in the absence of Jahn-Teller effects. [9] A d 5 +hole (d 5 +h) picture is also expected from detailed electronic structure calculations on related Ca 14 MnBi 11 compound. [10] This is in accord with the understanding of the most heavily studied dilute magnetic semiconductor (DMS) GaAs:Mn which is suggested by multiple experiments to have also a d 5 +h Mn configuration.…”

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confidence: 55%

Kondo lattice behavior in the ordered dilute magnetic semiconductorYb14−xLaxMnSb11

et al. 2005

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We report Hall, magnetic, heat capacity and doping studies from single crystals of Yb14MnSb11 and Yb13.3La0.7MnSb11. These heavily doped semiconducting compounds are ferromagnetic below 53 K and 39 K respectively. The renormalization of the carrier mass from 2me near room temperature to 15me at 5 K , plus the magnetic evidence for partial screening of the Mn magnetic moments suggest that these compounds represent rare examples of an underscreened Kondo lattice with TK ≈ 350 K.

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confidence: 55%

Kondo lattice behavior in the ordered dilute magnetic semiconductorYb14−xLaxMnSb11

et al. 2005

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“…32 However, the presence of the transition metal changes the electronic structure and bonding within this structure type. 33 X-Ray magnetic circular dichroism (XMCD) 34 and XPS 35 measurements show that, indeed, the ytterbium is in the Yb 2+ valence state replacing Ca 2+ ; however, the manganese has been shown to be in the Mn 2+ valence state, supplying one less electron than Al 3+ .…”

Section: Transition Metal Zintl Phasesmentioning

confidence: 99%

Zintl phases for thermoelectric devices

2007

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By converting waste heat into electricity and improving the efficiency of refrigeration systems, thermoelectric devices could play a significant role in solving today's energy problems. Increasing the thermoelectric efficiency (as measured by the thermoelectric material's figure-of-merit, zT) is critical to the development of this technology. Complex Zintl phases, in particular, make ideal candidates for thermoelectric materials because the necessary "electron-crystal, phonon-glass" properties can be engineered with an understanding of the Zintl chemistry. A recent example is the discovery that Yb 14 MnSb 11 , a transition metal Zintl compound, has twice the zT as the material currently in use at NASA. This perspective outlines a strategy to discover new high zT materials in Zintl phases, and presents results pointing towards the success of this approach.

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“…There is also usually a dramatic drop in R indices. The new program has been tested on a variety of structures (Velazquez, Baumann, Olmstead, Hope, Barrett & Hoffman, 1993;Brock, Hope & Kauzlarich, 1994;Rehr, Kuromoto, Kauzlarich, Del Castillo & Webb, 1994;Balch, Ginwalla, Lee, Noll & Olmstead, 1994). [Although the latter paper does not reference XABS2, it was actually used (Olmstead, 1994)-].…”

Section: Examplesmentioning

confidence: 99%

XABS2: an empirical absorption correction program

Parkin¹,

Moezzi²,

Hope³

1995

J Appl Crystallogr

643

459

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The XABS2 Fortran program calculates an empirical absorption correction based on minimization of the 2 differences between F2bs and Fca~. The basic algorithm has been used in the crystallography laboratory at the University of California, Davis for over a decade, in the form of the program XABS. XABS relied upon an approximately linear relationship for spherical crystals between the transmission factor and sin 2 0 for 0 < 30 ° when /,R < 5. In XABS2, deviations from linearity are accounted for by a cubic equation in sin 2 0, which makes it applicable over the whole range of diffraction angle. The program needs no data in addition to the unique set but assumes a bisecting (symmetric) data-collection mode on a four-circle diffractometer. Since it does not require knowledge of the diffractometer setting angles, it can be applied even in cases where details of the original data collection are unknown.

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Structure and properties of the transition-metal Zintl compounds A14MnPn11 (A = Ca, Sr, Ba; Pn = As, Sb)

Abstract: The compounds AuMnPnn (A = Ca, Sr, Ba; Pn = As, Sb), have been synthesized by reacting the elements in stoichiometric amounts in welded Nb tubes sealed in quartz ampules at high temperature (1250 °C). Single-crystal X-ray data (130 K, tetragonal, Iijacd (142), Z = 8) were

Cited by 92 publications

References 1 publication

Kondo lattice behavior in the ordered dilute magnetic semiconductorYb14−xLaxMnSb11

Kondo lattice behavior in the ordered dilute magnetic semiconductorYb14−xLaxMnSb11

Zintl phases for thermoelectric devices

XABS2: an empirical absorption correction program

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