Synthesis, structure, and properties of La[sub 1[minus]x]Sr[sub x]TiO[sub 3] (0 [le] x [le] 1)
- Univ. of California, Davis, CA (United States)
The search for a new superconductor in an early transition metal oxide prompted the investigation of the La[sub 1[minus]x]Sr[sub x]TiO[sub 3] series of compounds. The solid solution La[sub 1[minus]x]Sr[sub x]TiO[sub 3] (0 [le] x [le] 1) has been prepared by arc melting stoichiometric amounts of SrTiO[sub 3] and LaTiO[sub 3]. Single-phase samples can be made for the entire stoichiometry range. The polycrystalline samples have been characterized using microprobe, thermogravimetric analysis, powder X-ray and neutron diffraction, temperature-dependent magnetization, and dc resistivity. The compounds crystallize in the orthorhombic space groups Pbnm (x [le] 0.30) and Ibmm (0.30 < x < 0.80), and the cubic space group Pm3m (x [ge] 0.80). The Pbnm structure exists in two forms, O[prime]-orthorhombic (x < 0.10) and O-orthorhombic (0.10 [le] x [le] 0.30), which are a result of Jahn-Teller distortion. The samples x = 0.00, 0.05 are canted antiferromagnets which exhibit a net ferromagnetic moment below 150 K and temperature-independent magnetism from 150 to 300 K. All other compositions show temperature-independent magnetism from 160 to 300 K with some samples (x [ge] 0.50) displaying paramagnetism in the low-temperature range. The temperature dependent resistivity measurements show that the samples are metallic (x [le] 0.70) and semiconducting (x = 0.90). The x = 0.80 sample undergoes a semiconductor-metal transition. The properties of these materials are discussed in reference to the phenomenological phase diagram for perovskites proposed by Goodenough and high-T[sub c] superconductivity.
- OSTI ID:
- 6722012
- Journal Information:
- Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 4:2; ISSN CMATEX; ISSN 0897-4756
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
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ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL PREPARATION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DISPERSIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
FERROMAGNETIC MATERIALS
GRAVIMETRIC ANALYSIS
ION MICROPROBE ANALYSIS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIZATION
MATERIALS
MICROANALYSIS
MIXTURES
NONDESTRUCTIVE ANALYSIS
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
SOLID SOLUTIONS
SOLUTIONS
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS