MAGNETOCALORIC RESPONSE OF NON-STOICHIOMETRIC NiMnGa ALLOYS AND THE INFLUENCE OF CRYSTALLOGRAPHIC TEXTURE.

Currently, there is significant interest in magnetocaloric materials for solid state refrigeration. In this work, polycrystalline Heusler alloys belonging to the NiMnGa family, with x between 0.08 and 0.

Rhombohedrally distorted γ-brasses Cr(1-x)Fe(x)Ga.

A series of rhombohedrally distorted γ-brass structures containing a mixture of magnetically active 3d elements, Cr and Fe, Cr(1-x)Fe(x)Ga, is investigated crystallographically. These structures consist of chains of trans-face-sharing Ga-centered transition metal icosahedra. Neutron powder diffraction specifically on Cr(0.

Structure determination of two modulated gamma-brass structures in the Zn-Pd System through a (3 + 1)-dimensional space description.

The structure determination of two composite compounds in the Zn-Pd system with close relationships to the cubic gamma-brass structure Zn(11-delta)Pd(2+delta) is reported. Their structures have been solved from single crystal X-ray diffraction data within a (3 + 1)-dimensional [(3 + 1)D] formalism. Zn(75.

To what extent does the Zintl-Klemm formalism work? The Eu(Zn(1-x)Ge(x))2 series.

The series of ternary polar intermetallics Eu(Zn(1-x)Ge(x))(2) (0 < or = x < or = 1) has been investigated and characterized by powder and single-crystal X-ray diffraction as well as physical property measurements. For 0.50(2) < or = x < 0.

BaHg2Tl2. An unusual polar intermetallic phase with strong differentiation between the neighboring elements mercury and thallium.

High yields of the novel BaHg(2)Tl(2) are achieved from reactions of the appropriate cast alloys at approximately 400 degrees C. (Isotypic SrHg(2)Tl(2) also exists.) The tetragonal barium structure (P4(2)/mnm, a = 10.