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Ordered perovskites with cationic vacancies. 10. Compounds of type A/sub 2/sup(II)Bsub(1/4)sup(II)Bsub(1/2)sup(III)vacantsub(1/4)Msup(VI)O/sub 6/ equal to A/sub 8/sup(II)Bsup(II)B/sub 2/sup(III)vacantM/sub 4/sup(VI)O/sub 24/ with Asup(II), Bsup(II) = Ba, Sr, Ca and Msup(VI) = U, W

Journal Article:

Abstract

Perovskites of type Ba/sub 8/Bsup(II)B/sub 2/sup(III)vacantU/sub 4/sup(VI)O/sub 24/ show polymorphic phase transformations of order disorder type. An 1:1 ordered orthorhombic HT form is transformed into a higher ordered LT modification with a fourfold cell content (four formula units Ba/sub 8/Bsup(II)B/sub 2/sup(III)vacantU/sub 4/O/sub 24/), compared to cubic 1:1 ordered perovskites A/sub 2/BMO/sub 6/. In the series Ba/sub 8/BaB/sub 2/sup(III)vacantW/sub 4/O/sub 24/ and Sr/sub 8/SrB/sub 2/sup(III)vacantW/sub 4/O/sub 24/ different ordering phenomena are observed. In comparison with 1:1 ordered cubic perovskites A/sub 2/BMO/sub 6/, the cell contains eight formula units A/sub 8/sup(II)Bsup(II) B/sub 2/sup(III)vacantW/sub 4/O/sub 2/4. The higher ordered cells with Usup(VI) and Wsup(VI) are face centered, which has its origin in an ordering of cationic vacancies.
Authors:
Betz, B; Schittenhelm, H J; Kemmler-Sack, S [1] 
  1. Tuebingen Univ. (Germany, F.R.). Lehrstuhl fuer Anorganische Chemie 2
Publication Date:
Jan 01, 1982
Product Type:
Journal Article
Reference Number:
AIX-13-698602; EDB-82-171402
Resource Relation:
Journal Name: Z. Anorg. Allg. Chem.; (German Democratic Republic); Journal Volume: 484
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; BARIUM COMPOUNDS; STRUCTURAL CHEMICAL ANALYSIS; CALCIUM COMPOUNDS; EUROPIUM COMPOUNDS; GADOLINIUM COMPOUNDS; HOLMIUM COMPOUNDS; LANTHANUM COMPOUNDS; LUTETIUM COMPOUNDS; NEODYMIUM COMPOUNDS; SAMARIUM COMPOUNDS; STRONTIUM COMPOUNDS; TERBIUM COMPOUNDS; THULIUM COMPOUNDS; TUNGSTATES; URANATES; YTTRIUM COMPOUNDS; LATTICE PARAMETERS; ORDER-DISORDER TRANSFORMATIONS; PEROVSKITES; SUPERLATTICES; VACANCIES; X-RAY DIFFRACTION; ACTINIDE COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; COHERENT SCATTERING; CRYSTAL DEFECTS; CRYSTAL STRUCTURE; DIFFRACTION; PHASE TRANSFORMATIONS; POINT DEFECTS; RARE EARTH COMPOUNDS; SCATTERING; TRANSITION ELEMENT COMPOUNDS; URANIUM COMPOUNDS; 400201* - Chemical & Physicochemical Properties; 400702 - Radiochemistry & Nuclear Chemistry- Properties of Radioactive Materials
OSTI ID:
6888517
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Journal ID: CODEN: ZAACA
Submitting Site:
HEDB
Size:
Pages: 177-186
Announcement Date:

Journal Article:

Citation Formats

Betz, B, Schittenhelm, H J, and Kemmler-Sack, S. Ordered perovskites with cationic vacancies. 10. Compounds of type A/sub 2/sup(II)Bsub(1/4)sup(II)Bsub(1/2)sup(III)vacantsub(1/4)Msup(VI)O/sub 6/ equal to A/sub 8/sup(II)Bsup(II)B/sub 2/sup(III)vacantM/sub 4/sup(VI)O/sub 24/ with Asup(II), Bsup(II) = Ba, Sr, Ca and Msup(VI) = U, W. Germany: N. p., 1982. Web. doi:10.1002/zaac.19824840116.
Betz, B, Schittenhelm, H J, & Kemmler-Sack, S. Ordered perovskites with cationic vacancies. 10. Compounds of type A/sub 2/sup(II)Bsub(1/4)sup(II)Bsub(1/2)sup(III)vacantsub(1/4)Msup(VI)O/sub 6/ equal to A/sub 8/sup(II)Bsup(II)B/sub 2/sup(III)vacantM/sub 4/sup(VI)O/sub 24/ with Asup(II), Bsup(II) = Ba, Sr, Ca and Msup(VI) = U, W. Germany. doi:10.1002/zaac.19824840116.
Betz, B, Schittenhelm, H J, and Kemmler-Sack, S. 1982. "Ordered perovskites with cationic vacancies. 10. Compounds of type A/sub 2/sup(II)Bsub(1/4)sup(II)Bsub(1/2)sup(III)vacantsub(1/4)Msup(VI)O/sub 6/ equal to A/sub 8/sup(II)Bsup(II)B/sub 2/sup(III)vacantM/sub 4/sup(VI)O/sub 24/ with Asup(II), Bsup(II) = Ba, Sr, Ca and Msup(VI) = U, W." Germany. doi:10.1002/zaac.19824840116. https://www.osti.gov/servlets/purl/10.1002/zaac.19824840116.
@misc{etde_6888517,
title = {Ordered perovskites with cationic vacancies. 10. Compounds of type A/sub 2/sup(II)Bsub(1/4)sup(II)Bsub(1/2)sup(III)vacantsub(1/4)Msup(VI)O/sub 6/ equal to A/sub 8/sup(II)Bsup(II)B/sub 2/sup(III)vacantM/sub 4/sup(VI)O/sub 24/ with Asup(II), Bsup(II) = Ba, Sr, Ca and Msup(VI) = U, W}
author = {Betz, B, Schittenhelm, H J, and Kemmler-Sack, S}
abstractNote = {Perovskites of type Ba/sub 8/Bsup(II)B/sub 2/sup(III)vacantU/sub 4/sup(VI)O/sub 24/ show polymorphic phase transformations of order disorder type. An 1:1 ordered orthorhombic HT form is transformed into a higher ordered LT modification with a fourfold cell content (four formula units Ba/sub 8/Bsup(II)B/sub 2/sup(III)vacantU/sub 4/O/sub 24/), compared to cubic 1:1 ordered perovskites A/sub 2/BMO/sub 6/. In the series Ba/sub 8/BaB/sub 2/sup(III)vacantW/sub 4/O/sub 24/ and Sr/sub 8/SrB/sub 2/sup(III)vacantW/sub 4/O/sub 24/ different ordering phenomena are observed. In comparison with 1:1 ordered cubic perovskites A/sub 2/BMO/sub 6/, the cell contains eight formula units A/sub 8/sup(II)Bsup(II) B/sub 2/sup(III)vacantW/sub 4/O/sub 2/4. The higher ordered cells with Usup(VI) and Wsup(VI) are face centered, which has its origin in an ordering of cationic vacancies.}
doi = {10.1002/zaac.19824840116}
journal = {Z. Anorg. Allg. Chem.; (German Democratic Republic)}
volume = {484}
journal type = {AC}
place = {Germany}
year = {1982}
month = {Jan}
}