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'barium' in keywords Facet   Publication Year 1994  [X]
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1Author    G. Tams, Hk Miiller-BuschbaumRequires cookie*
 Title    A Contribution to the Crystal Chemistry of Alcaline Alealine Earth Precious Metal Perovskites. Synthesis and Crystal Structure of NaBa4Cuo,5Pti,50 8  
 Abstract    Single crystals of the phase NaBa4Cu0 5P t1 s0 8 were prepared in closed silver tubes. The black and moisture sensitive crystals were investigated by four-circle diffractometer X-ray tech­ niques. They show trigonal symmetry, space group D2-P321, a = 10.0644, c = 8.3811 A, Z = 3 and belong to the perovskites. The typical M20 9 double octahedra are occupied by Pt4+ and Cu2+ in a different manner. Na+ is partly in and out of the centres of trigonal prisms of oxygen. These features will be discussed with respect 
  Reference    Z. Naturforsch. 49b, 585—588 (1994); eingegangen am 12. Januar 1994 
  Published    1994 
  Keywords    Sodium, Barium, Copper, Platinum, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0585.pdf 
 Identifier    ZNB-1994-49b-0585 
 Volume    49 
2Author    S. Möhr, Hk Müller-BuschbaumRequires cookie*
 Title    Ein gemischtvalentes Oxometallat mit Cr3+ anstelle von Ti3+: Ba2Ti4+Cr20 13  
 Abstract    Single crystals of Ba2Ti4+C r20 13 w ere p rep a red by C 0 2-L A S E R h igh te m p era tu re r ea ctio n s and in v estig a te d by X -ra y w o rk . T h e c o m p o u n d c ry sta llize s w ith m o n o c li­ nic sym m etry, a = 15.0 1 8 5 , b = 3 .9 4 1 9 , c -9 .0 7 6 4 Ä , ß = 9 8 .1 3 7 °, Z = 2. B a 2T i4Cr20 13 is iso ty p ic to N a 2T i60 13. T h e crystal stru ctu re is d isc u sse d w ith r e sp e ct to o rd ered or d iso rd ered d istrib u tio n s o f T i4+ and C r3+ u sin g c a lc u la tio n s o f C o u lo m b term s o f la ttice energy. It is sh o w n , th at th e sta b ility o f th is stru ctu re ty p e w ill b e d e c r e ­ ased by rep la ce m en t o f N a + by io n s w ith h ig h er o x id a tio n sta tes. 
  Reference    Z. Naturforsch. 49b, 911 (1994); eingegangen am 17. Februar 1994 
  Published    1994 
  Keywords    Barium, Titanium, Chromium, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0911.pdf 
 Identifier    ZNB-1994-49b-0911 
 Volume    49 
3Author    S. Möhr, Hk Müller-BuschbaumRequires cookie*
 Title    Uber ein gemischtvalentes Oxoniobat mit planaren Polygonen um Niob und Barium: BaNb2+Nb2+0 6 On a Mixed Valent Oxoniobate Containing Planar Polygons A round Niobium and Barium: BaNb2 +N b^+0 6  
 Abstract    Single crystals of B aN b30 6 were prepared by C 0 2-LA SER high temperature technique. The compound crystallizes with trigonal symmetry C fv-R 3 m , a = 11.4333, c -3.4949Ä , Z = 3. The new structure type is characterized by planar N b 0 4 and planar B a 0 6 polygons. The results are discussed with respect to related compounds like Ca0.75 Nb3O6 or N aNb30 6. 
  Reference    Z. Naturforsch. 49b, 915 (1994); eingegangen am 17. Februar 1994 
  Published    1994 
  Keywords    Barium, Niobium, Oxide, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0915.pdf 
 Identifier    ZNB-1994-49b-0915 
 Volume    49