Structural phase transition and structural properties in oxygenated La2CuO4+y; y ∼ 0.02

M. Hidaka, K. Tanaka, M. Yoshimura, Masaaki Ohba, K. Yamada, H. Wakimoto

Research output: Contribution to journalArticle

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Abstract

The crystal structure of the oxygenated La2CuO4+y; y ∼ 0.02 has been studied by X-ray diffraction. It is found that the structural phase transition from tetragonal to orthorhombic symmetry occurring at about 450 K (Tc) is of second order and shows diffuse scattering above Tc. The diffuse scattering is related to static and/or dynamic short-range order of cooperative tilts of rigid-like elongated CuO6 octahedra, which make two-dimensional networks stacked along the [001] axis. The structures at room temperature and 210 K are determined using a 4-circle X-ray diffractometer and have the orthorhombic space group 10D2h-Pccn. The structure is mainly characterized by anisotropic cooperative tilts of the CuO6 octahedra around the [100]p and [010]p primitive axes in two-dimensional octahedron-networks, where suffix "p" means pseudo K2NiF4-type structure. The anisotropy of the tilting-angles results from pushing by excess oxygen atoms to apical oxygen atoms of the CuO6 octahedra. It is also found by refinement of the structure that the excess oxygen atoms are randomly sited at the atomic coordinates (1/4, 1/4, 0.244) and/or (1/4, 1/4, 0.279).

Original languageEnglish
Pages (from-to)391-408
Number of pages18
JournalPhase Transitions
Volume74
Issue number4
DOIs
Publication statusPublished - Jan 1 2001

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Structural properties
oxygen atoms
Phase transitions
Oxygen
Atoms
Scattering
pushing
Diffractometers
diffractometers
scattering
Anisotropy
x rays
Crystal structure
X ray diffraction
X rays
anisotropy
crystal structure
symmetry
room temperature
diffraction

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Materials Science(all)

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Structural phase transition and structural properties in oxygenated La2CuO4+y; y ∼ 0.02. / Hidaka, M.; Tanaka, K.; Yoshimura, M.; Ohba, Masaaki; Yamada, K.; Wakimoto, H.

In: Phase Transitions, Vol. 74, No. 4, 01.01.2001, p. 391-408.

Research output: Contribution to journalArticle

Hidaka, M. ; Tanaka, K. ; Yoshimura, M. ; Ohba, Masaaki ; Yamada, K. ; Wakimoto, H. / Structural phase transition and structural properties in oxygenated La2CuO4+y; y ∼ 0.02. In: Phase Transitions. 2001 ; Vol. 74, No. 4. pp. 391-408.
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