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1979 (2)
1978 (1)
1976 (3)
1Author    Herbert Brunner, Reginald GruehnRequires cookie*
 Title    Synthesis and Structure of a New Polymorph of FeNb0 4  
 Abstract    Three different polymorphs of FeNbC>4 were prepared by chemical transport. One of them is a new modification, which crystallisizes in the GaNb04-type, monoclinic, space group C2, o= 12.52 A; 6 = 3.83 A; c=6.67Ä; 107.5°. The detailed structure, composed of 2 X 2 'blocks' of corner shared metal-oxygen octahedra, was investigated by electron-diffraction and two-dimensional high resolution electron microscopy. Bisherige Untersuchungen an FeNb04, 
  Reference    (Z. Naturforsch. 31b, 318—320 [1976]; eingegangen am 21. Oktober 1975) 
  Published    1976 
  Keywords    Iron Niobate, Crystal Structure, Electron Diffraction, High Resolution Electron Microscopy 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0318.pdf 
 Identifier    ZNB-1976-31b-0318 
 Volume    31 
2Author    Eberhard Krämer, Reginald GruehnRequires cookie*
 Title    Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, VI* Präparative und strukturelle Untersuchung von WNb15O40F und nahe benachbarten Defektstrukturen im System Nb205-W03-Nb02F Contributions to the Study of Inorganic Non-Stoichiometrie Compounds, VI* Preparative and Structural Investigations of WNb15O40F and Closely Related Defect Structures in the System Nb205-W03-Nb02F  
 Abstract    In the quaternary system H-Nb20s-W03-Nb02F the phase WNbi504oF was prepared in form of light-yellow needles. The compound crystallizes in the monoclinic system with the unit cell dimensions a = 22.254 A, b = 3.829 A, c = 20.298 A and ß= 114.29°, space group C 2. Electron optical investigations showed the crystal structure containing 5 x 3 x co-blocks of Nb-(0, F)-octahedra, with metal atoms in tetrahedral positions located at the junctions of every four blocks. X-ray investigations showed a range of homogeneity between (O, F)/(W, Nb) = 2.556 <2.563 (WNbi5O40F) <2.571. The hypothetical phase WNbis047F2 with 6 x 3-blocks was found as a microdomain by electron microscopy. 
  Reference    (Z. Naturforsch. 31b, 1569—1573 [1976]; eingegangen am 2. September 1976) 
  Published    1976 
  Keywords    System Nb20s-W03-Nb02F, Crystal Structures, Defect Structures, High Resolution Electron Microscopy 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1569.pdf 
 Identifier    ZNB-1976-31b-1569 
 Volume    31 
3Author    Hartmut Hibst, Reginald GruehnRequires cookie*
 Title    Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, VII a Ein neuer einfacher Weg zur Berechnung von [(0,F)/Me]-Werten bei Blockstrukturen Contributions to the Study of Inorganic Non-Stoichiometric Compounds, VII a A New Simple Method to Calculate Values of [(0,F)/Me] for Block Structures  
 Abstract    A simple, quick and reliable method is derived to calculate values of [(0,F)/Me] for block structures. The method of calculation is exemplified using ideal and real (defect) block structures and inconsistent published data. The method represents a simple means to systematically classify block structures. 
  Reference    Z. Naturforsch. 33b, 884—890 (1978); eingegangen am 13. Februar/12. Juni 1978 
  Published    1978 
  Keywords    Block Structures, Crystal Structures, Defect Structures, High Resolution Electron Microscopy 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0884.pdf 
 Identifier    ZNB-1978-33b-0884 
 Volume    33 
4Author    Günter Heurung, Reginald Gruehn, Herbert BrunnerRequires cookie*
 Title    Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, Villa Elektronenmikroskopischer Nachweis neuer, eng begrenzter Defekte bei Blockstrukturen und Berechnung ihrer O/Me-Werte Contributions to the Study of Inorganic Non-Stoichiometric Compounds, VIII a Electronmicroscopical Proof of New, Small Area Defects of Block Structures and Calculation of Their O/Me Values  
 Abstract    Compounds of the systems Fe203-Nb205 (O/Me < 2.5) and Nb205-W03 (O/Me > 2.5) were prepared by chemical transport. The block structures of the obtained phases were investigated by high resolution transmission electron microscopy. The unusual defects observed were nearly identical in both systems. A recently devel-oped method to calculate the O/Me value of block structures [ 1 ] was extended and used for these defects. 
  Reference    Z. Naturforsch. 34b, 553—562 (1979); eingegangen am 27. November 1978 
  Published    1979 
  Keywords    Block Structures, Crystal Structures, Defect Structures, High Resolution Electron Microscopy 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0553.pdf 
 Identifier    ZNB-1979-34b-0553 
 Volume    34 
5Author    Herbert Brunner, Reginald Gruehn, Wilhelm MertinRequires cookie*
 Title    an FeNblx029, FeNb29074 und TiNb14037 Contributions to the Study of Inorganic Non-Stoichiometric Compounds, V* Preparation and Electron Optical Investigation of FeNbn029, FeNb29 0 74 and TiNb14037  
 Abstract    FeNbn029(m), FeNbn029(o) and two mixed oxides with the composition limits FeNb29074 and TiNbi4037 were prepared by chemical transport. The crystal structures of the compounds have been examined by two-dimensional high resolution electron-micro-scopy. They are composed of 'blocks' of (n x 3) corner shared octahedra and belong to a series of structure related compounds with the general formula Me3nOsra-3-Crystallo-graphic defects and the thermic behavior of the materials are discussed. 
  Reference    (Z. Naturforsch. 31b, 549—553 [1976]; eingegangen am 5. Januar 1976) 
  Published    1976 
  Keywords    Iron-niobium-oxides, Titan-niobium-oxides, Chemical Transport, Crystal Structures, High Resolution Electron Microscopy 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0549.pdf 
 Identifier    ZNB-1976-31b-0549 
 Volume    31 
6Author    Günter Heurung, Reginald GruehnRequires cookie*
 Title    Beiträge zur Untersuchung anorganischer nichtstöchiometrischer Verbindungen, IX a Elektronenmikroskopische Untersuchungen an Kristallen aus Transportexperimenten -System Nb205-W03 (I) Contributions to the Study of Inorganic Non-Stoichiometric Compounds, IX a Electron Microscopical Investigations on Crystals Prepared by Chemical Transport in the System Nb205-W03 (I)  
 Abstract    Compounds near the composition Nb205: WO3 ~ 6:1 were prepared by chemical trans-port (at relatively low temperatures). The block structures of the obtained samples were investigated by high resolution electron microscopy. Besides unusual defects microdomains were found which still contain edgesharing blocks even at the composition 0/27Me = 2.53 to 2.55. 
  Reference    Z. Naturforsch. 34b, 1377—1384 (1979); eingegangen am 18. Juni 1979 
  Published    1979 
  Keywords    Block Structures, Defect Structures, High Resolution Electron Microscopy, Niobium Tungsten Oxides, Chemical Transport 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1377.pdf 
 Identifier    ZNB-1979-34b-1377 
 Volume    34