Anisotropy of thermal expansion of the brannerite-type MnV sub 2 O sub 6 : Effect of doping with MoO sub 3 and Li sub 2 O; theoretical predictions, verification, new rules

Journal Article · Fri Mar 01 00:00:00 EST 1991 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1016/0022-4596(91)90060-U· OSTI ID:5518524

Bobinski, W; Ziolkowski, J ^[1]

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1. Polish Academy of Sciences, Krakow (Poland)

Thermal expansion of the brannerite-type phases has been studied with the high temperature X-ray diffraction between room-temperature and the decomposition temperatures of 535-660C. The studies involved the MnLi = Mn{sub 1{minus}y}Li{sub y}V{sub 2{minus}y}Mo{sub y}O{sub 6} (0{le}y{le}1) solid solutions, including the lateral compounds MnV{sub 2}O{sub 6} and LiVMoO{sub 6} and the MnLi{phi} = Mn{sub 1{minus}x{minus}y}{phi}{sub x}Li{sub y}V{sub 2{minus}2x{minus}y}Mo{sub 2x+y}O{sub 6} (x{sub max} between 0.16 and 0.45) solid solutions in which Mo{sup 6+} ions are substituted randomly for V{sup 5+} and similarly Li{sup 1+} and cation vacancies {phi} for Mn{sup 2+}. The results were processes with a number of computer programs and the coefficients of linear thermal expansion d{sub 11} > d{sub 33} {ge} d{sub 22} along the main orthogonal X, Y, Z axes have been determined. Y coincides with the crystallographic (010) axis, X lies in the (010) plane and makes an angle {alpha}{sub x} with the crystallographic (100) of 54-82C, depending on the temperature and composition. The values of d{sub ii} are between 0.2 {times} 10{sup {minus}5} and 7.5 {times} 10{sup {minus}5}.

• OSTI ID: 5518524
• Journal Information: Journal of Solid State Chemistry; (United States), Vol. 91:1; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MANGANESE OXIDES
THERMAL EXPANSION
VANADIUM OXIDES
DOPED MATERIALS
EXPERIMENTAL DATA
HIGH TEMPERATURE
SOLID SOLUTIONS
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
DISPERSIONS
EXPANSION
INFORMATION
MANGANESE COMPOUNDS
MATERIALS
MIXTURES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SOLUTIONS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
360204* - Ceramics
Cermets
& Refractories- Physical Properties