Synthesis and study in 23 metal-La-Cu-O systems

Journal Article · Sun Jan 31 23:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1063· OSTI ID:6516138

Webb, A W; Skelton, E F; Qadri, S B; Carpenter, Jr, E R ^[1]

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1. Naval Research Lab., Washington, DC (United States)

High-pressure, high-temperature synthesis of LaCuO[sub 3], the substituted series La[sub 1[minus]x]M[sub x]CuO[sub 3], where M = Mg, Ca, Sr, Ba, Pb, Sc, Y, Pr, Nd, Tl, Sb, Bi, Ti, Zr, or Ce, and LaCu[sub 1[minus]x]M[sub s][prime]O[sub 3], where M[prime] = Cr, Fe, Co, Ni, Zn, Ag, or Tl, was undertaken. The rhombohedrally distorted perovskite structure of LaCuO[sub 3] was found to persist in the following systems, where the number in parentheses is the maximum x: Ag (1.0), Ba (0.8), Bi (0.6), Ca (0.8), Ce (0.4), Co (1.0), Cr (0.2), Fe (0.2), Mg (0.8), Nd (0.4), Ni (1.0), Pr (0.4), Sb (0.2), Sc (0.2), Sr (0.8), Ti (0.1), Zr (0.8). This structure was not found with Y, Pb, or Zn at any level of substitution, although Zn did permit formation of this structure when Ni was used instead of Cu. This structure was detected at the x = 0.6 level with Tl, but not at x = 0.4 or 0.8. Samples were tested for superconductivity effects by magnetic susceptibility, without positive results. The synthesis stability region of P-T space for LaCuO[sub 3] was found to be above 1,200[degrees]C at pressures above 5 GPa. Stability of LaCuO[sub 3] at ambient pressure was studied by differential thermal analysis, and an endothermic phase change to a tetragonal structure was noted around 400[degrees]C. The relationship of these results to the high-temperature superconducting copper oxide ceramics is discussed. 58 refs., 4 figs., 5 tabs.

• OSTI ID: 6516138
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 102:2; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
ANTIMONY COMPOUNDS
ANTIMONY OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
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CERIUM COMPOUNDS
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CHALCOGENIDES
CHEMICAL PREPARATION
CHROMIUM COMPOUNDS
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COBALT COMPOUNDS
COBALT OXIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IRON COMPOUNDS
IRON OXIDES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
LEAD COMPOUNDS
LEAD OXIDES
MAGNESIUM COMPOUNDS
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MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NEODYMIUM COMPOUNDS
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NICKEL COMPOUNDS
NICKEL OXIDES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
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PRESSURE EFFECTS
RARE EARTH COMPOUNDS
SCANDIUM COMPOUNDS
SCANDIUM OXIDES
SILVER COMPOUNDS
SILVER OXIDES
STOICHIOMETRY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTIVITY
SYNTHESIS
THALLIUM COMPOUNDS
THALLIUM OXIDES
THERMAL ANALYSIS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH PRESSURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZINC COMPOUNDS
ZINC OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES