Synthesis and solid state studies on Mb/sub 2/Sb/sub 2/O/sub 7/ and (Mn/sub 1-x/Cd/sub x/)/sub 2/Sb/sub 2/O/sub 7/ pyrochlores

Journal Article · Sun Apr 01 00:00:00 EST 1984 · J. Solid State Chem.; (United States)

DOI:https://doi.org/10.1016/0022-4596(84)90182-8· OSTI ID:7056888

Subramanian, M A; Clearfield, A; Umarji, A M; Shenoy, G K; Subba Rao, G V

Pyrochlore oxides of the type Mn/sub 2/Sb/sub 2/O/sub 7/ and (Mn/sub 2//sub 1-x/Cd/sub x/)/sub 2/Sb/sub 2/O/sup 7/ have been synthesized by high-temperature solid state reactions and characterized by X-ray diffraction and chemical analysis. X-ray diffraction studies showed that the compound Mn/sub 2/Sb/sub 2/O/sub 7/ has a rhombohedrally distorted pyrochlore structure. In the solid solution (Mn/sub 1-x/Cd/sub x/)/sub 2/Sb/sub 2/O/sub 7/, the phases with x greater than or equal to 0.6 are cubic. Magnetic and /sup 121/Sb Moessbauer studies indicate that all the Mn and Sb are present in the +2 and +5 state occupying A and B sites, respectively, in the pyrochlore structure. Electrical measurements indicate that the compounds are insulators or semiconductors exhibiting p-type behavior. The stoichiometry and probable cause of the rhombohedral distortion in Mn/sub 2/Sb/sub 2/O/sub 7/ and solid solutions are discussed.

• Research Organization: Texas A and M Univ., College Station
• OSTI ID: 7056888
• Journal Information: J. Solid State Chem.; (United States), Vol. 52:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIMONY OXIDES
CHEMICAL PREPARATION
X-RAY DIFFRACTION
CADMIUM OXIDES
MANGANESE OXIDES
ANTIMONY 121
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
MOESSBAUER EFFECT
SOLID SOLUTIONS
STRUCTURAL CHEMICAL ANALYSIS
ANTIMONY COMPOUNDS
ANTIMONY ISOTOPES
CADMIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
DISPERSIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MANGANESE COMPOUNDS
MIXTURES
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SOLUTIONS
STABLE ISOTOPES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties
360602 - Other Materials- Structure & Phase Studies
360603 - Materials- Properties