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Title Oxygen-deficient SrTiO sub 3 minus x , x = 0. 28, 0. 17, and 0. 08. Crystal growth, crystal structure, magnetic, and transport properties
Creator/Author Gong, Wenhe ; Yun, H. ; Ning, Y.B. ; Greedan, J.E. ; Datars, W.R. ; Stager, C.V. (McMaster Univ., Hamilton, Ontario (Canada))
Publication Date1991 Feb 01
OSTI IdentifierOSTI ID: 5624434
Other Number(s)Journal ID: ISSN 0022-4596; CODEN: JSSCB
Resource TypeJournal Article
Resource RelationJournal Name: Journal of Solid State Chemistry; (USA); Journal Volume: 90:2
Subject36 MATERIALS SCIENCE; STRONTIUM OXIDES; CRYSTAL GROWTH; CRYSTAL STRUCTURE; HALL EFFECT; TITANIUM OXIDES; EXPERIMENTAL DATA; LATTICE PARAMETERS; MONOCRYSTALS; PEROVSKITES; TEMPERATURE DEPENDENCE; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTALS; DATA; DIFFRACTION; ELECTRON MICROSCOPY; INFORMATION; MICROSCOPY; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; SCATTERING; STRONTIUM COMPOUNDS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS
Description/AbstractThe grossly nonstoichiometric perovskites SrTiO{sub 3{minus}x} with x = 0.28, 0.17, and 0.08 were prepared from a reaction of Sr{sub 2}TiO{sub 4}, TiO, and TiO{sub 2} at 1,500{degree}C. For x = 0.28 relatively large single crystals were obtained. Also for this sample the crystal symmetry was found to depend on the rate of cooling from the reaction temperature and the annealing conditions. Rapidly cooled samples are tetragonal a = 3.9177(3) {angstrom}, c = 3.8878(5) {angstrom}. Samples annealed in vacuum at temperatures of 1,000 to 600{degree}C are cubic a = 3.9177(3) {angstrom}, c = 3.8878(5) {angstrom}. Samples annealed in vacuum at temperatures of 1,000 to 600{degree}C are cubic a = 3.9075(3) {angstrom} with no change in cell volume. Single crystal data from a tetragonal sample indicate slight preferential occupancy of one oxygen position in P4/mmm. No evidence for any supercell due to defect ordering could be seen by TEM in either cubic or tetragonal samples. The x = 0.28 crystals show metallic resistivity, {rho}(300 K) = 6 {times} 10{sup {minus}4} ohm-cm and temperature-independent paramagnetism. {chi}{sub m} = 118 {times} 10{sup {minus}6} cm{sup 3} mole{sup {minus}1}. Hall effect data from 300 to 4.2 K analyzed on a single carrier model give a temperature-independent n-type carrier density of 2.4 {times} 10{sup 21} cm{sup {minus}3}.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: X; Size: Pages: 320-330
System Entry Date2008 Feb 07

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