Go toArchive
Browse byFacets
Bookbag ( 0 )
'Rare earths' in keywords Facet   section ZfN Section B  [X]
Facet   Publication Year 1997  [X]
Results  4 Items
Sorted by   
Publication Year
1997[X]
1Author    J.-P Werner, Hk Müller-BuschbaumRequires cookie*
 Title    Elektroneutrale Pb40 4 -Heterokubaneinheiten in den Aluminatsodalithen Ln4[Al12024](Pb404)2 (Ln = Nd, Sm) Electrically Neutral Pb40 4 Heterocubane Units in Aluminate Sodalites Ln4[A l,2 0 24](Pb4 0 4 )2 (Ln = Nd, Sm)  
 Abstract    Single crystals of Ln4[A lI20 24](Pb40 4)2 (Ln = Nd, Sm) have been prepared by flux techni­ ques. The compounds crystallize with cubic symmetry, space group Oh-Pn3m, a ^ = 9.514(1), asm = 9.481(1) A, Z = 1. The crystal structure is characterized by a [A1120 24] U~ framework. Four of the eight six-membered rings of A104-tetrahedra per sodalite cage are centered by Ln3+ ions. The cages of the resulting electrically neutral network are filled with [Pb40 4]±) heterocubane units. Oxygen of the heterocubane units completes the coordination spheres of the rare earth ions to hexagonal bipyramids. 
  Reference    Z. Naturforsch. 52b, 449—452 (1997); eingegangen am 17. Januar 1997 
  Published    1997 
  Keywords    Lead, Rare Earth, Aluminate Sodalite, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0449.pdf 
 Identifier    ZNB-1997-52b-0449 
 Volume    52 
2Author    Ch Rabbow, S. Panzer, H.K M Üller-, Busch-BaumRequires cookie*
 Title    Röntgenstrukturanalyse von zwei Verbindungen des  
 Abstract    Kupfertyps BaMLn20 5 (M = Zn, Ln = Sm, Tm) und von BaSmAIZn30 7 X -R ay A nalysis of Two C om pounds of the C o p p er Type B aM L n20 5 (M = Z n, Ln = Sm, Tm) and of B aS m A lZ n 30 7 The barium zinc lanthanoide oxides BaZnSm20 5 (I) and BaZnTm20 5 (II) crystallize in the BaCuLn20 3 copper type with orthorhom­ bic symmetry, space group D^-Pnma, (I): a = 12.575(2), b = 5.804(1), c = 7.198(1) A and (II): a = 12.258(2), b = 5.684(1), c = 7.010(2) A, Z = 4. Zinc shows square pyramidal oxygen coordina­ tion, but the strong elongation of the C u 0 5 pyra­ mid in the copper type is missing. BaSmAlZn30 7 crystallizes in the space group C6V -P63mc, a = 6.346(1), c = 10.237(3) Ä, Z = 2. The metal coordi­ nation of oxygen and the shifts of the ratio Al : Zn at the sites (6c) and (2a) depending on the size of the lanthanoid ions are discussed. 
  Reference    Z. Naturforsch. 52b, 546—548 (1997); eingegangen am 30. Dezember 1996 
  Published    1997 
  Keywords    Barium, Rare Earth, Zinc, Aluminium, Oxide, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0546_n.pdf 
 Identifier    ZNB-1997-52b-0546_n 
 Volume    52 
3Author    O. Sfreddo, Hk Müller-BuschbaumRequires cookie*
 Title    Geschlossene ^ [(PtDy4O i6)4]-Polyedertunnel in Ba13Dy8Zn4Pt4037 Closed ^ [(PtDy40 16)4] Polyhedra Tunnels in Ba13Dy8Zn4Pt40 37  
 Abstract    Single crystals of Bai3Dy8Zn4Pt40 37 have been prepared by reaction of mixtures of BaC03, ZnO and Dy20 3 at temperatures up to 1225 °C using platinum crucibles. X-ray investigations led to a new crystal structure with tetragonal symmetry, space group C4h-I4/m, a = 18.659(7), c = 5.734(2) A, Z = 2. The structure is characterized by P t0 6 and B a06 octahedra as well as by tetragonal Z n 0 5 pyramids and single capped trigonal prisms of oxygen around dysprosium. The remaining barium positions show coordination numbers of nine and ten. The crystal structure has large ^ [(PtDy40)6)4] polyhedra tunnels. Considering the 1 [Ln4O l6]20_ polyhedra groups some parts of the structure show similarities to BaZnLn20 5, B a ^ n 4Ln8Ö2i and Ba2Ln2ZnPt08. 
  Reference    Z. Naturforsch. 52b, 553—556 (1997); eingegangen am 6. März 1997 
  Published    1997 
  Keywords    Barium, Rare Earth, Zinc, Platinum, Oxide 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0553.pdf 
 Identifier    ZNB-1997-52b-0553 
 Volume    52 
4Author    Ho, Er, Ho Dy, Er, Y. O. Sfreddo, Hk Müller-BuschbaumRequires cookie*
 Title    Weitere Verbindungen des Bai7Lnj6Zn8Pt4057-Typs mit Ln = Dy More Compounds of the B a17Ln16Zn8Pt40 57 Type with Ln =  
 Abstract    Single crystals of B a|7D y16Zn8Pt40 57 (I), Ba17HO|6Zn8Pt40 57 (II), BaI7Er16Zn8Pt4057 (III) and Ba17Y 16Zn8Pt40 57 (IV) have been prepared by high temperature reactions using platinum crucibles. X-ray investigations led to tetragonal symmetry, space group C4h -I4/m, (I) -(IV): a = 22.905(1), 22.840(1), 22.795(1), 22.848(1) Ä and c = 5.728(1), 5.722(1), 5.700(1), 5.709(1) A, Z = 2. The crystal structure is characterized by small square, medium-sized quadrangular and large rectangular tunnels, which are filled by oxygen, barium and zinc. The polyhedra network is discussed with respect to the network of compounds of the Ba13D y8Zn4Pt40 37 type. 
  Reference    Z. Naturforsch. 52b, 1067—1071 (1997); eingegangen am 6. Mai 1997 
  Published    1997 
  Keywords    Barium, Rare Earth, Zinc, Platinum, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1067.pdf 
 Identifier    ZNB-1997-52b-1067 
 Volume    52