Synthesis and structure of PrBa[sub 2]Cu[sub 2]Co[sub 1]O[sub 7+y]: A new nonsuperconducting orthorhombic 123 system

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1039· OSTI ID:6786779

Hegde, M S; Ramesh, S; Panchapagesan, T S ^[1]

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1. Indian Inst. of Science, Bangalore (India)

PrBa[sub 2]Cu[sub 3-x]Co[sub x]O[sub 7+y] (0 < x < 1) crystallizes in tetragonal structure for small values of x (0.1 < x < 0.3) and in orthorhombic structure for 0.4 < x < 1, as revealed by X-ray and electron diffraction studies. The end member PrBa[sub 2]Cu[sub 2]CoO[sub 7.4] shows orthorhombic to tetragonal structural transition with decrease in oxygen content just as YBa[sub 2]Cu[sub 3]O[sub 7-7](123) and PrBa[sub 2]Cu[sub 3]O[sub 7-y](Pr123). From the structure and reactivity, the Co ion in PrBa[sub 2]Cu[sub 2]CoO[sub 7+y] is suggested to occupy the Cu(2) (plane Cu) position and the oxygen excess over 7 to occupy the (0,0,1/2) position between the CuO[sub 2]-CuO[sub 2] (CoO[sub 2]) sheets. The structure supports two types of labile oxygen, one associated with the chain Cu(1) and the other in the interlayer associated with the Co ion, as revealed by anaerobic oxidation of ammonia. 23 refs., 7 figs., 3 tabs.

• OSTI ID: 6786779
• 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
&amp; Refractories-- Structure &amp; Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
ALKALINE EARTH METAL COMPOUNDS
AMMONIA
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COBALT COMPOUNDS
COBALT OXIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON DIFFRACTION
HYDRIDES
HYDROGEN COMPOUNDS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
ORTHORHOMBIC LATTICES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
RARE EARTH COMPOUNDS
REACTIVITY
SCATTERING
STOICHIOMETRY
SYNTHESIS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION