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- W2036780328 abstract "Die hexagonalen Perowskite Ba3BIIMO9 (MV Nb, Ta) kristallisieren mit BII Mg, Ca in einer 3 L-Struktur (Sequenz (c)3) und BII Sr im hexagonalen BaTiO3-Typ (6 L; Sequenz (hcc)2) mit jeweils einer 1:2 Ordnung der B- und M-Ionen. Intensitätsberechnungen an Ba3SrNb2O9 und Ba3SrTa2O9 ergaben in der R.G. P63/mmc einen verfeinerten, auf die Intensitäten bezogenen R′-Wert von 8,4% (Nb) bzw. 9,0% (Ta). Für BII Ba besitzt Ba3BaTa2O9 eine rhombisch deformierte 6 L-Struktur und bildet mit Ba3SrTa2O9 eine lückenlose Reihe von Mischkristallen (Ba3Sr1−xBaxTa2O9). Im System Ba3Sr1−xBaxNb2O9 ist der Existenzbereich des hexagonalen BaTiO3-Typs auf die Sr-reichere Seite beschränkt; die reine Ba-Verbindung kristallisiert in einem eigenen Strukturtyp (5 L: Ba5BaNb3□O13,5□1,5). Compounds of the Type Ba3BIIMO9 with BII Mg, Ca, Sr, Ba, and MV Nb, Ta The hexagonal perovskites Ba3BIIMO9 (MV Nb, Ta) crystallize with BII Mg Ca in a 3 L structure (sequence (c)3) and BII ; Sr in the hexagonal BaTiO3 type (6 L; sequence (hcc)2) with an 1:2 order for the B and M ions. Intensity calculations for Ba3SrNb2O9 and Ba3SrTa2O9 gave in the space group P63/mmc a refined, intensity related R′ value of 8.4% (Nb) and 9.0% (Ta) respectively. For BII Ba the perovskite Ba3BaTa2O9 has an orthorhombic distorted 6 L structure and forms with Ba3SrTa2O9 a continuous series of mixed crystals (Ba3Sr1−xBaxTa2O9). In the system Ba3Sr1−xBaxNb2O9 the range of existence of the hexagonal BaTiO3 type is confined to the Sr richer end. The pure Ba compound possesses a proper structure type (5 L: Ba5BaNb3□O13.5□1.5)." @default.
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- W2036780328 date "1981-08-01" @default.
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- W2036780328 title "�ber Verbindungen vom Typ Ba3BIIM2VO9 mit BII ? Mg, Ca, Sr, Ba und MV ? Nb, Ta" @default.
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- W2036780328 doi "https://doi.org/10.1002/zaac.19814790822" @default.
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