Synthesis, structure, and properties of La1-xSrxTiO3 (0 < x < 1)

Joseph E. Sunstrom IV, Susan M. Kauzlarich, Peter Klavins

Research output: Contribution to journalArticle

70 Scopus citations

Abstract

The search for a new superconductor in an early transition metal oxide prompted the investigation of the La1-xSrxTiO3 series of compounds. The solid solution La1-xSrxTiO3 (0 ≤ x ≤ 1) has been prepared by arc melting stoichiometric amounts of SrTiO3 and LaTiO3. 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 ≤ 0.30) and Ibmm (0.30 < x < 0.80), and the cubic space group Pm3m (x ≥ 0.80). The Pbnm structure exists in two forms, O′-orthorhombic (x < 0.10) and O-orthorhombic (0.10 ≤ x ≤ 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 ≥ 0.50) displaying paramagnetism in the low-temperature range. The temperature dependent resistivity measurements show that the samples are metallic (x ≤ 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-Tc superconductivity.

Original languageEnglish (US)
Pages (from-to)346-353
Number of pages8
JournalChemistry of Materials
Volume4
Issue number2
StatePublished - 1992

ASJC Scopus subject areas

  • Materials Chemistry
  • Materials Science(all)

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    Sunstrom IV, J. E., Kauzlarich, S. M., & Klavins, P. (1992). Synthesis, structure, and properties of La1-xSrxTiO3 (0 < x < 1). Chemistry of Materials, 4(2), 346-353.