Structural, transport, and magnetic properties of the Nd{sub 1-x}A{sub x}TiO{sub 3} (A = Ca, Sr, Ba) system where 0 {le} x {le} 1
- Univ. of Maryland, College Park, MD (United States)
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.
- OSTI ID:
- 552733
- Journal Information:
- Journal of Solid State Chemistry, Vol. 114, Issue 1; Other Information: PBD: Jan 1995
- Country of Publication:
- United States
- Language:
- English
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