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Author Eylem, C. ♦ Eichhorn, B. W. ♦ Ju, H. L. ♦ Greene, R. L.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ TITANIUM OXIDES ♦ MAGNETIC PROPERTIES ♦ PHASE DIAGRAMS ♦ CALCIUM OXIDES ♦ STRONTIUM OXIDES ♦ BARIUM OXIDES ♦ NEODYMIUM OXIDES ♦ CHEMICAL PREPARATION ♦ SAMPLE PREPARATION ♦ ELECTRIC CONDUCTIVITY ♦ MAGNETIC SUSCEPTIBILITY ♦ PEROVSKITES
Abstract A series of perovskite Nd{sub 1-x}A{sub x}TiO{sub 3} (A = Ca, Sr, Ba) compounds has been prepared by the dc-arc melting technique in the composition range 0 {le} x {le} {approximately} 1.0. The substitution of Sr and Ba in NdTiO{sub 3} results in structural phase transitions from orthorhombic (Pbnm) to cubic (Pm3m). The Nd{sub 1-x}Ca{sub x}TiO{sub 3} series remains orthorhombic throughout the range studied. Low field magnetic susceptibility measurements and remanent magnetic moment studies suggest that the Ti sublattice in the insulating Nd{sub 1-x} A{sub x}TiO{sub 3} compounds (0 {le} x {le} {approximately} 0.2) orders as canted antiferromagnets. The Nd{sub 1-x}A{sub x}TiO{sub 3} compounds show compositionally dependent metal-insulator transitions that coincide with the disappearance of the magnetic ordering. The correlations between the structure and transport properties are discussed in terms of the Ti-O-Ti angle and Ti-O bond distance. The perovskite tolerance factor, t, is also shown to be a useful parameter to sort insulating and metallic phases in these compounds.
ISSN 00224596
Educational Use Research
Learning Resource Type Article
Publisher Date 1995-01-01
Publisher Place United States
Journal Journal of Solid State Chemistry
Volume Number 114
Issue Number 1


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