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Author Campa, J. A. ♦ Gutierrez-Puebla, E. ♦ Monge, M. A. ♦ Valero, R. C. ♦ Mira, J. ♦ Rivas, J.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ COPPER OXIDES ♦ CRYSTAL STRUCTURE ♦ MAGNETIC SUSCEPTIBILITY ♦ NEODYMIUM OXIDES ♦ GERMANIUM OXIDES ♦ MONOCLINIC LATTICES ♦ CRYSTAL GROWTH ♦ X-RAY DIFFRACTION ♦ ABSORPTION SPECTROSCOPY
Abstract After crystals of CuNd{sub 2}Ge{sub 2}O{sub 8} are grown using CuO as self flux, the crystal structure is determined by single-crystal X-ray diffraction in the space group Cm (No. 8) to an R value of 5.1%. It is monoclinic, with a = 9.846(2){angstrom}, b=15.335(5) {angstrom}, c=8.336(1) {angstrom}, {beta}=148.48(2), V=657.9(5) {angstrom}{sub 3}, Z=4, and D{sub c}=6.31 g cm{sup -3}. CuNd{sub 2}Ge{sub 2}O{sub 8} shows a novel tridimensional structure type with chains of very distorted CuO{sub 6} octahedra, two kinds of coordinations for germanium (GeO{sub 5} trigonal bipyramids and rather regular GeO{sub 4} tetrahedra), and NdO{sub 8} triangulated dodecahedra. Above 100 K the reciprocal of the dc magnetic susceptibility of CuNd{sub 2}Ge{sub 2}O{sub 8} follows the Curie-Weiss law {chi}{sup -1} = 162(1)T+5971(93)g Oe/emu, with Weiss constant of spectra in the range 1000-100 cm{sup -1} are related to those of comparable species. The absorption spectrum at room temperature in the 350-7000 nm region is also given.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-12-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 120
Issue Number 2


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