Structural analysis of metastable pseudobrookite ferrous titanium oxides with neutron diffraction and Mossbauer spectroscopy

Journal Article · Mon Oct 01 00:00:00 EDT 1990 · Journal of Solid State Chemistry; (USA)

DOI:https://doi.org/10.1016/0022-4596(90)90229-Q· OSTI ID:6290563

Teller, R G; Antonio, M R ^[1]; Grau, A E; Gueguin, M ^[2]; Kostiner, E ^[3]

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1. BP Research, Cleveland, OH (USA)
2. QIT-Fer et Titane Inc., Sorel, Quebec (Canada)
3. Univ. of Connecticut, Storrs (USA)

Four synthetic iron titanium oxides with the pseudobrookite (AB{sub 2}O{sub 5}, Cmcm, Z = 4) structure have been prepared and characterized by neutron diffraction and zero-field, natural abundance {sup 57}Fe Mossbauer effect spectroscopy (MES). The combination of the element specificity of MES with the different neutron scattering lengths of Ti and Fe ({minus}0.33 and 0.95 {times} 10{sup {minus}12} cm, respectively) offers a unique opportunity to distinguish between cation distributions on the two (A and B) sites. Two of the samples have been prepared in low temperature experiments (quenched from 1,200{degree}C) and have the stoichiometry FeTi{sub 2}O{sub 5}, and Fe{sub .6}Mg{sub .6}Ti{sub 1.8}O{sub 5}. The third and fourth samples are commercial iron titanium oxides prepared by the reduction of ilmenite ore with carbon above 1,700{degree}C. The stoichiometries of these samples are Mn{sub 0.05}Fe{sub 0.33}Ti{sub 2.52}O{sub 5} and Fe{sub .33}Mg{sub .31}Ti{sub 2.36}O{sub 5}. Results from these experiments indicate that for each of these samples the B site is predominantly (> 65%) occupied by Ti, while the A site contains a mixture of Ti, Fe, and/or Mg. However, only at higher temperatures (> 1,700{degree}C) is the B site devoid of ferrous cations.

• OSTI ID: 6290563
• Journal Information: Journal of Solid State Chemistry; (USA), Vol. 88:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
IRON 57
MOESSBAUER EFFECT
TITANIUM OXIDES
STRUCTURAL CHEMICAL ANALYSIS
CHEMICAL PREPARATION
EXPERIMENTAL DATA
IRON OXIDES
NEUTRON DIFFRACTION
PHASE STUDIES
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
EVEN-ODD NUCLEI
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON COMPOUNDS
IRON ISOTOPES
ISOTOPES
NUCLEI
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
SCATTERING
STABLE ISOTOPES
SYNTHESIS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
656002 - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)