Compounds of the type Ba3Bsup(II)M2sup(V)O9 with Bsup(II) = Mg, Ca, Sr, Ba, and Msup(V) = Nb, Ta
Creators
- 1. Tuebingen Univ. (Germany, F.R.). Lehrstuhl fuer Anorganische Chemie 2
Description
The hexagonal perovskites Ba3Bsup(II)M2sup(V)O9 (Msup(V) = Nb, Ta) crystallize with Bsup(II) = Mg, Ca in a 3 L structure (sequence (c)3) and Bsup(II) = 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 Bsup(II) = Ba the perovskite Ba3BaTa2O9 has an orthorhombic distorted 6 L structure and forms with Ba3SrTa2O9 a continuous series of mixed crystals (Ba3Srsub(1-x)Basub(x)Ta2O9). In the system Ba3Srsub(1-x)Basub(x)Nb2O9 the range of existence of the hexagonal BaTiO3 type is confined to the Sr richer end. The pure Ba compound posesses a proper structure type (5 L: Ba5BaNb3vacantOsub(13.5)vacantsub(1.5)). (author)
Additional details
Additional titles
- Original title (German)
- Ueber Verbindungen vom Typ Ba
Publishing Information
- Journal Title
- Z. Anorg. Allg. Chem.
- Journal Volume
- 479
- Series
- Z. Anorg. Allg. Chem.
- Journal Page Range
- 177-183
- ISSN
- 0044-2313
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- German Democratic Republic
- INIS RN
- 13671043
- Subject category
- S37: INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY;
- Is Lead record
- Yes
- Descriptors DEI
- BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CHEMICAL PREPARATION; HEXAGONAL LATTICES; LATTICE PARAMETERS; MAGNESIUM COMPOUNDS; NIOBATES; STRONTIUM COMPOUNDS; STRUCTURAL CHEMICAL ANALYSIS; X-RAY DIFFRACTION
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; NIOBIUM COMPOUNDS; OXYGEN COMPOUNDS; SCATTERING; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS