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Chemical-substitution-induced successive symmetry descent and structure–property correlation for "114" oxides CaBa1−xSrxZn2Al2O7.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 3/7/2020, Vol. 49 Issue 9, p3007-3014, 8p
- Publication Year :
- 2020
-
Abstract
- The crystal structures, photoluminescence properties, and transport properties of a series of new "114" oxides CaBa<subscript>1−x</subscript>Sr<subscript>x</subscript>Zn<subscript>2</subscript>Al<subscript>2</subscript>O<subscript>7</subscript> (x = 0–1) were investigated in detail. Careful Rietveld refinements performed on solid solution samples revealed that the structural symmetry of CaBa<subscript>1−x</subscript>Sr<subscript>x</subscript>Zn<subscript>2</subscript>Al<subscript>2</subscript>O<subscript>7</subscript> evolves from hexagonal P6<subscript>3</subscript>mc (x < 0.2) to trigonal P31c (0.2 ≤ x ≤ 0.6) and then to orthorhombic Pna2<subscript>1</subscript> (x > 0.6) with an increase of the Sr<superscript>2+</superscript>-content, which is cooperative with the rotation of T1O<subscript>4</subscript> tetrahedra around the c-axis. Eu<superscript>3+</superscript> was used as a local structural probe to gain an insight into the structure, which further corroborated the correctness of the observed structural symmetry descending sequence in CaBa<subscript>1−x</subscript>Sr<subscript>x</subscript>Zn<subscript>2</subscript>Al<subscript>2</subscript>O<subscript>7</subscript>. More importantly, the reduction of structural symmetry is also associated with a tendency from layered ordering to complete charge ordering transition for Zn<superscript>2+</superscript>/Al<superscript>3+</superscript> cations, which was revealed to have a significant influence on the transport properties. These findings are expected to offer a route to manipulate the physical properties of "114" oxides containing magnetic cations. [ABSTRACT FROM AUTHOR]
- Subjects :
- STRONTIUM
ALUMINUM-zinc alloys
SYMMETRY
RIETVELD refinement
OXIDES
SOLID solutions
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 49
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 142040101
- Full Text :
- https://doi.org/10.1039/c9dt04566j