Structural, transport, and magnetic properties of the nd1-xaxtio3 (a = ca, sr, ba) system where 0 ≤ x ≤ 1

C. Eylem, H. L. Ju, B. W. Eichhorn, R. L. Greene

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Abstract

A series of perovskite Nd1-xAxTiO3 (A = Ca, Sr, Ba) compounds has been prepared by the dc-arc melting technique in the composition range 0 ≤ x ≤ ∼1.0. The substitution of Sr and Ba in NdTiO3 results in structural phase transitions from orthorhombic (Pbnm) to cubic (Pm3m). The Nd1-xCaxTiO3 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 Nd1-xAxTiO3 compounds (0 ≤ x ≤ ∼0.2) orders as canted antiferromagnets. The Nd1-xAxTiO3 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.

Original languageEnglish
Pages (from-to)164-173
Number of pages10
JournalJournal of Solid State Chemistry
Volume114
Issue number1
DOIs
Publication statusPublished - 1995 Jan

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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