Arthur Mar

Crystal structures of La3ZrSb5, La3HfSb5, and LaCrSb3· Structural relationships in ternary rare-earth antimonides

Abstract The crystal structures of the ternary rare-earth antimonides La 36 ZrSb 5 , La 3 HfSb 5 , and LaCrSb 3 have been determined from single-crystal X-ray data (La 3 ZrSb 5 : P 6 3 / mcm, Z =2, a =9.5743(9) A, c =6.3495(7) A, V =504.1(1) A 3 , T =-60°C. La 3 fSb 5 : P 6 3 / mcm, Z =2, a = 9.557(2) A, c = 6.3388(6) A, V =501.4(1) A 3 , T =-60°C. LaCrSb 3 : Pbcm, Z =4, a =13.2835(7) A, b = 6.2127(2) A, c =6.116(l) A, 7=504.8(1) A 3 T =22 °C.) The structure of La 3 M Sb 5 ( M =Zr, Hf) consists of chains of Sb atoms and chains of face-sharing MSb 6 octahedra, separated by La atoms. LaCrSb 3 is isostructural to CeCrSb 3 , and consists of nearly square sheets of Sb atoms and layers efface- and edge-sharing CrSb 6 octahedra, separated by the rare-earth atoms. The RE CrSb 3 series, previously shown to exist for RE =La, Ce, Pr, Nd, Sm, has now been extended to include RE=Gd , Tb, Dy. Structural relationships between various ternary rare-earth antimonides are drawn.

Chains, planes, and antimonides

Abstract Ternary rare-earth main-group pnictides RE x M y Pn z where M is a Group 13 or 14 element and Pn is P, As, Sb, or Bi form an emerging class of solid state compounds that frequently display extensive homoatomic MM and PnPn bonding in addition to heteroatomic MPn bonding in their anionic substructures. Their structures, properties, and bonding are discussed, with a focus on the antimonides, which have been most heavily investigated.

The Role of Ni-Mn Hybridization on the Martensitic Phase Transitions in Mn-rich Heusler Alloys

Room temperature x-ray diffraction, dc magnetization, and ac susceptibility measurements have been performed on a series of Mn rich Ni50Mn37-xCrxSb13 and Ni50+xMn37-xSb13 Heusler alloys. Depending on the value of x, the room temperature crystal structures of the samples are either L21 cubic or orthorhombic. It is a commonly accepted idea that the martensitic transition temperatures in Ni-Mn-Z (Z = Ga, In, Sb, Sn) based Heusler alloys decrease (increase) with decreasing (increasing) valence electron concentration, e/a. However, the present work shows that regardless of the change in e/a, the martensitic transition temperature (TM) decreases with increasing Cr or Ni concentration. These results support the model where, in the case of Mn rich Heusler alloys, it is the hybridization between the Ni atoms and the Mn atoms in the Z sites that plays the dominant role in driving the martensitic transformation.

Trigonal Planar [HgSe3]4– Unit: A New Kind of Basic Functional Group in IR Nonlinear Optical Materials with Large Susceptibility and Physicochemical Stability

A new mercury selenide BaHgSe2 was synthesized. This air-stable compound displays a large nonlinear optical (NLO) response and melts congruently. The structure contains chains of corner-sharing [HgSe3](4-) anions in the form of trigonal planar units, which may serve as a new kind of basic functional group in IR NLO materials to confer large NLO susceptibilities and physicochemical stability. Such trigonal planar units may inspire a path to finding new classes of IR NLO materials of practical utility that are totally different from traditional chalcopyrite materials.

X-ray photoelectron spectroscopy study of the skutterudites La Fe 4 Sb 12 , Ce Fe 4 Sb 12 , Co Sb 3 , and Co P 3

The electronic structure of the skutterudites

Effects of metal substitution in transition-metal phosphides (Ni1−xM′x)2P (M′ = Cr, Fe, Co) studied by X-ray photoelectron and absorption spectroscopy

\mathrm{Co}{\mathrm{Sb}}_{3}

Enhancement of ferromagnetism by Cr doping in Ni-Mn-Cr-Sb Heusler alloys

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Perspective: Web-based machine learning models for real-time screening of thermoelectric materials properties

\mathrm{Co}{\mathrm{P}}_{3}

Ternary arsenides A2Zn2As3 (A = Sr, Eu) and their stuffed derivatives A2Ag2ZnAs3.

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Quaternary Arsenides AM1.5Tt0.5As2 (A = Na, K, Rb; M = Zn, Cd; Tt = Si, Ge, Sn): Size Effects in CaAl2Si2- and ThCr2Si2-Type Structures

\mathrm{La}{\mathrm{Fe}}_{4}{\mathrm{Sb}}_{12}