Abstract
Single crystal of (I) CuEuMo 2O 8 and (II) CuHoMo 2O 8 were prepared by recrystallization from melts and investigated by X-ray work. Both crystallize with orthorhombic symmetry, space group C 7 h 15- Pbca, (I) a = 10.16677, b = 9.6958, c = 14.5468 A ̊ , (II) a = 10.2857, b = 9.7770, c = 14.6697 A ̊ ; Z = 8 . The connected between MoO 4 tetrahedra with square antiprismatic polyhedra around Ln 3+ and a nearly triangular CuO 3 group are discussed with respect to calculations of Coulombterms of lattice energy concerning different oxidation states on the copper and molybdenum point positions.
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