Orthorhombic distortion in Ca2-xGdxMnO4

Junichi Takahashi, Hidenori Nakada, Hirohisa Satoh, Naoki Kamegashira

Research output: Contribution to journalConference articlepeer-review

4 Citations (Scopus)

Abstract

The crystal structure of the polycrystalline Ca2-xGd xMnO4 has been investigated by Rietveld method using X-ray diffraction patterns measured at room temperature. Within the limited substitution range, 0 < x < 0.45, Ca2-xGdxMnO 4 has the K2NiF4-type structure. In x = 0.2 X-ray spectrum shows the tetragonal primitive structure (space group I4/mmm). In the range of x from 0.35 to 0.45 an orthorhombic superstructure (space group Pccn), whose unit cell relates to the tetragonal primitive structure with a o ≈ bo ≈ 2at, co ≈ c t, is refined. The orthorhombic superstructure contains the oxygen connected MnO6 octahedra with a different tilt angle between x- and y-axes of the orthorhombic unit cell. The magnitude of the rotation of the MnO6 octahedra around x-axis increases with increasing the substitution of x in Ca2-xGdxMnO4, and that around y-axis shows the maximum at x = 0.4.

Original languageEnglish
Pages (from-to)598-602
Number of pages5
JournalJournal of Alloys and Compounds
Volume408-412
DOIs
Publication statusPublished - 2006 Feb 9
EventProceedings of the Rare Earths'04 in Nara, Japan -
Duration: 2004 Nov 72004 Nov 12

Keywords

  • Calcium rare-earth manganate
  • KNiF-type oxides
  • Orthorhombic structure
  • Oxygen octahedron

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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