Structural analyses of Gd3(Al,Ga)5O12 garnet solid solutions via X-ray and UV absorption spectroscopy experiments for Gd atoms

Mamoru Kitaura, Kei Kamada, Toshiaki Ina, Hisanori Yamane, Manabu Ishizaki, Shinta Watanabe, Junpei Azuma, Isamu Yamamoto, Akimasa Ohnishi, Takeshi Usuki

Research output: Contribution to journalArticlepeer-review

Abstract

Local structures of Gd atoms in Gd3(Al, Ga)5O12 garnet solid solutions, grown using the Czochralski method, have been studied at low temperatures through X-ray and UV absorption spectroscopy experiments. From the Fourier transforms (FTs) of Gd K-edge extended X-ray absorption fine structure (EXAFS) oscillations, the preferential sites for the occupation of Ga and Al atoms were assigned to the 24d and 16a sites, respectively. The interatomic distances between Gd and neighboring atoms, and the Debye–Waller factors were determined through the fit to the inverse FTs. Positional fluctuations of neighboring O atoms buffered local distortions induced by the occupation of Ga and Al atoms at the same crystallographic sites. The change in the high-resolution UV absorption spectra due to Gd intra-4f transitions on the Ga content is explained by considering the crystal field and Coulomb repulsion on the Gd atom.

Original languageEnglish
Article number159055
JournalJournal of Alloys and Compounds
Volume867
DOIs
Publication statusPublished - 2021 Jun 25

Keywords

  • Crystal growth
  • Crystal structure
  • Optical material
  • Optical properties
  • XAFS (EXAFS and XANES)

ASJC Scopus subject areas

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

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