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1Author    Hartmut Schmider, VedeneH. Smith, Wolf WeyrichRequires cookie*
 Title    On the Inference of the One-Particle Density Matrix from Position and Momentum-Space Form Factors  
 Abstract    A modification of a recently developed method for the least-squares reconstruction of a one-par-ticle reduced density matrix from experimentally accessible expectation values is applied to the test systems of atomic beryllium and neon. The improvement of the resulting matrices through inclusion of electron correlation is demonstrated. Their quality is judged by comparison of the moments of the position and momentum densities and of the spherically averaged density matrix in a suitable representation. 
  Reference    Z. Naturforsch. 48a, 211—220 (1993); received June 3 1992 
  Published    1993 
  Keywords    Density matrix, Reconstruction, Least-squares fit, Beryllium, Neon 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0211.pdf 
 Identifier    ZNA-1993-48a-0211 
 Volume    48 
2Author    M. Schweizer, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Verbindungsbildung von MeO : M203, Teil III Zur Kenntnis von BeGa204 Compound Formation Me0:M203, Part III BeGa2C>4  
 Abstract    A new compound, BeGa204, was prepared by high temperature reaction between BeO and Ga203. X-ray single crystal investigations show a hitherto unknown structure type of M2+M23+04 compounds. BeGa204 crystallizes with hexagonal symmetry a = 775.0 and c = 298.0 pm, space group C£h-P63/m. Be 2+ and Ga 3+ are statistically distributed and are surrounded by 0 2--tetrahedra. 
  Reference    Z. Naturforsch. 34b, 1067—1069 (1979); eingegangen am 10. Mai 1979 
  Published    1979 
  Keywords    Beryllium, Gallium, Oxide, X-ray, Crystal Structure 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1067.pdf 
 Identifier    ZNB-1979-34b-1067 
 Volume    34 
3Author    Hk Müller-Buschbaum, S. FrenzenRequires cookie*
 Title    Zur  
 Abstract    Kenntnis von EuBeGd20 5 mit einem Beitrag über Phasen der Zusammensetzung M1 _xM'A .BeLn20 5 : Ca0,4Sr0,6BeSm2O5, Ba0,25Ca0,75BeNd2O5 und Ba0,36Sr0,64BeNd2O5 On E uB eG d20 5 and on Phases of the Composition M 1_^M'xBeLn20 5: Ca0,4Sr06BeSm2O 5, Bao,2sCao,75 BeNd2 0 5 and Ba0 3 6 Sr0,64BeNd2O5 Single crystals of (I): E uB eG d20 5, (II): Ca0,4Sr0ABeSm 20 5, (III): Ba0,25 Ca()75B eN d2O 5 and (IV): Ba<)3 6Sr()64B eN d2O s were prepared by (I): plasma torch and (II)-(IV): C 0 2-LASER technique. X-Rayo investigations lead to (I) monoclinic (space group C 2h-P2j/c, a = 7.126, b = 6.457, c = 9.394 A, ß = 90.40°) and (I I)-(I V) orthorhombic symmetry (D ^ -P n m a). (II: a = 9.454, b = 7.142, c = 6.490 A; III: a = 9.508, b = 7.188, c = 6.531 A; IV: a = 9.642, b = 7.295, c = 6.614 A). In contrary to the phases M j^ M '^ B eL ^ O s, E uBeG d2Os is characterized by an ordered distribution of Eu2+ and G d3+ inside o f the Kagome network. 
  Reference    Z. Naturforsch. 49b, 919 (1994); eingegangen am 28. Februar 1994 
  Published    1994 
  Keywords    Alkaline Earth, Beryllium, Rare Earth, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0919.pdf 
 Identifier    ZNB-1994-49b-0919 
 Volume    49 
4Author    M. Aria Maneva, M. Itko Georgiev, Norbert Lange, HeinzDieter LutzRequires cookie*
 Title    Zur Kenntnis von Berylliumiodat und -periodat - Röntgenographische, IR-und Raman-spektroskopische Untersuchungen On Beryllium Iodates and Periodates -X-Ray, IR , and R am an Studies  
 Abstract    Phase relationships and therm al decomposition of beryllium iodates and periodates were studied by X-ray and spectroscopic (IR, Ram an) measurements. B e(I03)2-4 H 20 , B e(I03)2, and Be(H4I 0 6)2-4 H 20 have been characterized. Be(H4I 0 6)2-4 H 20 (hitherto claimed in the lit­ erature to be a metaperiodate) dehydrates on heating with decomposition to form B e(I03)2. Anhydrous beryllium periodate was not obtained. On dehydration of B e(I0 3)2-4 H 20 , an­ hydrous B e(I03)2 is formed, which decomposes into BeO, I2, and 0 2 on further heating. 
  Reference    Z. Naturforsch. 46b, 795—799 (1991); eingegangen am 27. November 1990 
  Published    1991 
  Keywords    Iodates, Periodates, Beryllium, Decomposition, IR Spectra, Ram an Spectra 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0795.pdf 
 Identifier    ZNB-1991-46b-0795 
 Volume    46