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Title: Synthesis, structure, and properties of La[sub 1[minus]x]Sr[sub x]TiO[sub 3] (0 [le] x [le] 1)

Abstract

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 =more » 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.« less

Authors:
; ;  [1]
  1. Univ. of California, Davis, CA (United States)
OSTI Identifier:
6722012
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials; (United States)
Additional Journal Information:
Journal Volume: 4:2; Journal ID: ISSN 0897-4756
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LANTHANUM OXIDES; CRYSTAL STRUCTURE; MAGNETIC PROPERTIES; STRONTIUM OXIDES; TITANIUM OXIDES; CHEMICAL PREPARATION; ELECTRIC CONDUCTIVITY; FERROMAGNETIC MATERIALS; ION MICROPROBE ANALYSIS; MAGNETIZATION; ORTHORHOMBIC LATTICES; SOLID SOLUTIONS; STOICHIOMETRY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; THERMAL GRAVIMETRIC ANALYSIS; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHEMICAL ANALYSIS; CRYSTAL LATTICES; DISPERSIONS; ELECTRICAL PROPERTIES; GRAVIMETRIC ANALYSIS; LANTHANUM COMPOUNDS; MAGNETIC MATERIALS; MATERIALS; MICROANALYSIS; MIXTURES; NONDESTRUCTIVE ANALYSIS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; QUANTITATIVE CHEMICAL ANALYSIS; RARE EARTH COMPOUNDS; SOLUTIONS; STRONTIUM COMPOUNDS; SYNTHESIS; TEMPERATURE RANGE; THERMAL ANALYSIS; TITANIUM COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 360204 - Ceramics, Cermets, & Refractories- Physical Properties

Citation Formats

Sunstrom, IV, J E, Kauzlarich, S M, and Klavins, P. Synthesis, structure, and properties of La[sub 1[minus]x]Sr[sub x]TiO[sub 3] (0 [le] x [le] 1). United States: N. p., Web.
Sunstrom, IV, J E, Kauzlarich, S M, & Klavins, P. Synthesis, structure, and properties of La[sub 1[minus]x]Sr[sub x]TiO[sub 3] (0 [le] x [le] 1). United States.
Sunstrom, IV, J E, Kauzlarich, S M, and Klavins, P. . "Synthesis, structure, and properties of La[sub 1[minus]x]Sr[sub x]TiO[sub 3] (0 [le] x [le] 1)". United States.
@article{osti_6722012,
title = {Synthesis, structure, and properties of La[sub 1[minus]x]Sr[sub x]TiO[sub 3] (0 [le] x [le] 1)},
author = {Sunstrom, IV, J E and Kauzlarich, S M and Klavins, P},
abstractNote = {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.},
doi = {},
url = {https://www.osti.gov/biblio/6722012}, journal = {Chemistry of Materials; (United States)},
issn = {0897-4756},
number = ,
volume = 4:2,
place = {United States},
year = {},
month = {}
}