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1998 (1)
1996 (1)
1977 (1)
1Author    W. Muschick, Hk Müller-BuschbaumRequires cookie*
 Title    Ein Beitrag zur Kristallchemie dreiwertiger Seltenerdoxide Zur Stabilisierung der m onoklinen B-Form  
 Abstract    Single crystals of 1 — a'Ho203 : xCaO (x = 0.07), CaHoC>2.5 (A) and Cao.5H 01.5O2.75 (B) were prepared by high temperature reaction and investigated with X-ray single crystal data. It can be shown that small amounts of CaO stabilize the monoclinic B-Typ of rare earth oxides. Phase (A) and (B) cannot be seen as a stabilized B-type crystal because they have an new crystal structure with space group C.7h-P 2 i/m, a = 656.6, b = 356.7, c = 529.4pm , ß = 92.3°; a = 650.2, b = 352.4, c = 584.5, ß = 92.3°. 
  Reference    (Z. Naturforsch. 32b, 495—498 [1977]; eingegangen am 15. Februar 1977) 
  Published    1977 
  Keywords    Holmium, Thulium, Calcium, X-ray, Crystal Structure 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0495.pdf 
 Identifier    ZNB-1977-32b-0495 
 Volume    32 
2Author    Karsten Bluhm, Andre WieschRequires cookie*
 Title    Synthese und Kristallstruktur von NiHo2(B20 5)2, das erste Nickellanthanoidborat mit einem ^ (B 20 5)4"-Anion Synthesis and Crystal Structure of NiHo2(B20 5)2, the First Nickel Lanthanoid Borates with a (^ (B 20 5)4" A nion  
 Abstract    Single crystals o f N iH o2(B20 5) 2 were prepared by a B20 3 flux-technique in high temperature reactions at 1450 °C and investigated by X-ray diffraction. They crystallize in the space group C 2h-P 2 ,/c (Nr. 14) with a = 451.0(4); b = 724.8(3); c = 938.8(6) pm; ß = 9 1 ,39(1)°; Z = 2. The compound is isotypic to CuTb2(B20 5) 2 as well as to the gadolinite structure (F eY 2 (B e S i0 5)2) and contains a two dimensional infinite anion with the formula 2 (B 2 0 5)4~. The borate layers consist o f four-and eight-membered rings o f edge-sharing B 0 4 tetrahedra. The layers are connected via copper-centered elongated oxygen-octahedra and slightly distorted tetragonal H o 0 8 antiprisms. 
  Reference    Z. Naturforsch. 51b, 677 (1996); eingegangen am 9. November 1995 
  Published    1996 
  Keywords    N ickel, Holmium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0677.pdf 
 Identifier    ZNB-1996-51b-0677 
 Volume    51 
3Author    Lanthanoid Borates, A. Wiesch, K. BluhmRequires cookie*
 Title    CuHo2[B20 5]2* Ein unerwarteter Strukturtyp in der Reihe der Kupferlanthanoidborate CuHo2[B20 5]2: An Unexpected Structure Type in the Series of Copper  
 Abstract    Single crystals of the new compound CuHo2 [B20 5 ]2 were obtained by using a B20 3 flux technique with CuO and Ho20 3 at 1050 °C. X-ray investigations on single crystals led to the space group P 2,/c (Nr. 14) with lattice parameters a = 454.3(2); b = 726.0(4); c = 936.0(5) pm; ß = 90.77(1)°; Z = 2. The compound is isotypic to CuTb2[B20 5 ] 2 as well as to the gadolinite structure (FeY2 [BeSi05]2). The structure exhibits layer-like 2 [B20 5]4~, a two-dimensional anion consisting of edge sharing B 0 4 -tetrahedra, which form four-and eight-membered rings. The layers are connected by elongated C u06-octahedra and slightly distorted tetragonal LnOs-antiprisms. 
  Reference    (Z. Naturforsch. 53b, 5—8 [1998]; eingegangen am 23. Oktober 1997) 
  Published    1998 
  Keywords    Copper, Holmium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0005.pdf 
 Identifier    ZNB-1998-53b-0005 
 Volume    53