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'Barium' in keywords Facet   Publication Year 1995  [X]
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Publication Year
1995[X]
1Author    Ingmar Persson, Magnus Sandström, Haruhiko Yokoyama, Monika Chaudhry, JapanRequires cookie*
 Title     
 Abstract    tr u c tu r e o f th e S o lv a te d S tr o n tiu m a n d B a riu m I o n s in A q u e o u s, D im e th y l S u lfo x id e a n d P y r id in e S o lu tio n , a n d C r y s ta l S tr u c tu r e o f S tr o n tiu m a n d B a r iu m H y d r o x id e O c t a h y d r a te Dedicated to Prof. Hitoshi Ohtaki on the occasion of his 60th birthday Single crystal X-ray data, collected at 298 K, are used to redetermine the crystal structure of the non-isomorphic compounds [Sr(H20)8](0H)2 and [Ba(H20)8](0H)2. The eight water oxygen atoms form distorted Archimedean antiprisms around the octahydrated metal ions with mean metal ion-oxygen distances 2.62 and 2.79 Ä for strontium and barium, respectively. A second coordination shell of 24 hydrogen-bonded oxygen atoms with mean metal ion-oxygen distances M • • • O" 4.76 and 4.80 A, respectively, is observed. The hydroxide ions in both structures have an unusual hydrogen bond arrangement with 5 bonds accepted and one donated. The structure of the solvated strontium and barium ions in aqueous, dimethyl sulfoxide and pyridine solutions has been studied by means of large angle X-ray scattering and extended X-ray absorption fine structure spectroscopy techniques. In aqueous solution independent determinations of the first-sphere metal-oxygen coordination by the two techniques resulted in the bond lengths Sr-O 2.63 (2) and Ba-O 2.81 (3) A, and for both metal ions a hydration number of 8.1 (3). The second coordination spheres are very diffuse with only about 13 water molecules at similar M • • • O" distances as in the crystal structures and 2-3 water molecules closer to the metal ions. In dimethyl sulfoxide solution both ions were found to coordinate 6.0 (5) solvent molecules with the distances Sr-O 2.54(1), Sr -S 3.77(1) A, and Ba-O 2.76(1), Ba -S 3.99(1) A. For the solvated ions in pyridine solution EXAFS measurements yielded the distances Sr-N 2.57 (2) and Ba-N 2.78 (3) A, with a probable solvation number of 6. Correlations of hydration enthalpies and partial molar volumes with experimental M-O bond distances in aqueous solution are used to discuss hydration numbers and bond character for all of the alkaline earth metal ions. 
  Reference    Z. Naturforsch. 50a, 21—37 (1995); received November 8 1994 
  Published    1995 
  Keywords    Barium, Strontium, Hydration, Solvation, Structure 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0021.pdf 
 Identifier    ZNA-1995-50a-0021 
 Volume    50 
2Author    Ch LangRequires cookie*
 Title      
 Abstract    Single crystals of LiBa2Cu30 6 have been pre­ pared by recrystallization from melts in a stream of dry Argon as well as by spontaneous CO 2-LASER heating. It crystallizes with orthorhom bic symmetry, space group -Fmmm, a = 8,219(2), b = 11,520 (2), c = 14,284(3) A, Z = 8. The crystal structure is isotypic to NaBa2Cu30 6. 
  Reference    Z. Naturforsch. 50b, 681—683 (1995); eingegangen am 19. September 1994 
  Published    1995 
  Keywords    Lithium, Barium, Copper, Oxide 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0681_n.pdf 
 Identifier    ZNB-1995-50b-0681_n 
 Volume    50 
3Author    G. Tams, HkM. Üller-BuschbaumRequires cookie*
 Title    Synthese und Röntgenstrukturanalyse von Ba4LiCu0 4(C03)2 Synthesis and X -R ay Analysis of B a4L iC u 0 4( C 0 3) 2  
 Abstract    Single crystals of Ba4LiCu0 4 (C0 3)2 have been prepared by C 0 2-L A SE R technique and investigated by single crystal X-ray diffraction. The compound crystallizes in the tetragonal space group D7d-I42m (No. 121), a = 5.767(1), c = 15.2614(7) A, Z = 2. It is isotypic with Ba4NaCu0 4(C03)2 and shows Li+ with octahedral and Cu3+ with square planar coordina­ tion by O2-. The crystal structure are discussed with respect to the related compounds Ba4N aA u 04(0 2)2 and Ba4K A u04( 
  Reference    (Z. Naturforsch. 50b, 56—6 [1995]; eingegangen am 2. August 1994) 
  Published    1995 
  Keywords    Barium, Lithium Copper, Oxide Carbonate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0056.pdf 
 Identifier    ZNB-1995-50b-0056 
 Volume    50 
4Author    S. Frenzen, Hk Müller-BuschbaumRequires cookie*
 Title    Uber einen 9L-Perowskit der Zusammensetzung Ba9Ru3? 2Mn5?8027 On a 9L-Perovskite of the Composition Ba9Ru3 2Mn5 80 27  
 Abstract    Single crystals of Ba9Ru3 2Mn5 80 27 have been prepared by flux techniques. X-ray four circle diffractometer measurements led to trigonal (rhombohedral) symmetry, space group D3d-R 3 m , a = 5.7043(5), c = 21.255(4) A , Z = 1. This phase is isotypic to B a R u 0 3. The crystal structure and the occupation of the M3O i2 triple octahedra by ruthenium and manga­ nese are discussed with respect to other oxides containing M30 12 groups in an ordered and disordered way. 
  Reference    Z. Naturforsch. 50b, 585 (1995); eingegangen am 10. Oktober 1994 
  Published    1995 
  Keywords    Barium, Ruthenium, M anganese, Oxide, Perovskite, Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0585.pdf 
 Identifier    ZNB-1995-50b-0585 
 Volume    50 
5Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Uber das Erdalkalimetall-Lanthanoid  
 Abstract    Kupfer-Oxomolybdat (Cu0,22Mg0 ,78)BaNd2Mo4O 16 The Alkaline Earth R are E arth Copper-Oxomolybdate (C u 0 . 2 2 M g 0 . 7 8) B a N d 2 M o 4 O 1 6 Single crystals of (Cu0.22Mg0 78)B aN d2M o4O i6 have been prepared by crystallization from melts and investigated by X-ray methods. The compound crystallizes monoclinically, space group C ^ -C 1 2 /cl, Z = 4, a = 5.351(1), b = 12.891(2), c = 19.391(4) Ä, ß = 90.899(14)° and is isotypic to CuKHo2M o40 16. The crystal structure is dominated by B aO 10 and N d 0 8 poly-hedra forming a three-dimensional polyhedra network, which is filled by axially distorted (C u,M g)O fi octahedra and M o 0 4 tetrahedra. 
  Reference    Z. Naturforsch. 50b, 577 (1995); eingegangen am 4. Oktober 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, M agnesium, Barium, Neodymium, Molybdenum, Oxide 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0577.pdf 
 Identifier    ZNB-1995-50b-0577 
 Volume    50