Crystal structures of Ca-free Pb[sub 2]Sr[sub 2]RCu[sub 3]O[sub 8] (R = La, Pr, Nd, Eu, Tb, and Dy) single crystals
- McMaster Univ., Hamilton, Ontario (Canada)
Structures of Pb[sub 2]Sr[sub 2]RCu[sub 3]O[sub 8] have been determined by single crystal X-ray diffraction. A monoclinic symmetry (C2/m, Z = 2) was found for those crystals with R = Pr, Nd, and Tb, orthorhombic (Cmmm, Z = 2) for R = La, and tetragonal (P4/mmm, Z = 1) for R = Eu and Dy. The relationship among different crystal symmetries can be understood in terms of different oxygen orderings in the PbO layers driven by the Pb[sup 2+] lone pair orientation. There is evidence for a [approximately]9% deficiency in electron density at the R = Eu and Dy sites (and [approximately]4.5% for R = Tb) which has been confirmed by mass spectroscopy as being due to cation vacancies at these sites. Bond valence sum calculations have been performed to evaluate the strains existing in the crystal structures of Pb[sub 2]Sr[sub 2]RCu[sub 3]O[sub 8]. 28 refs., 8 figs., 5 tabs.
- OSTI ID:
- 6518616
- Journal Information:
- Journal of Solid State Chemistry; (United States), Vol. 102:2; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COPPER OXIDES
CRYSTAL STRUCTURE
DYSPROSIUM OXIDES
EUROPIUM OXIDES
LANTHANUM OXIDES
LEAD OXIDES
NEODYMIUM OXIDES
PRASEODYMIUM OXIDES
STRONTIUM OXIDES
TERBIUM OXIDES
ELECTRON DENSITY
LAYERS
MASS SPECTROSCOPY
MATHEMATICAL MODELS
MONOCLINIC LATTICES
ORTHORHOMBIC LATTICES
STRAINS
TETRAGONAL LATTICES
VACANCIES
VALENCE
X-RAY DIFFRACTION
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL LATTICES
DIFFRACTION
DYSPROSIUM COMPOUNDS
EUROPIUM COMPOUNDS
LANTHANUM COMPOUNDS
LEAD COMPOUNDS
NEODYMIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
PRASEODYMIUM COMPOUNDS
RARE EARTH COMPOUNDS
SCATTERING
SPECTROSCOPY
STRONTIUM COMPOUNDS
TERBIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies