Polytypic modifications in heavily Tb and Eu doped gadolinium aluminum borate crystals

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Abstract

The evidence of a new polytypic phase was demonstrated in double doped gadolinium aluminum borate (GAB) crystals grown by the high temperature top seeded solution growth (HTTSSG) method. The structures of the rhombohedral and the new monoclinic phases in the Eu 0.02Tb 0.12Gd 0.86Al 3(BO 3) 4 and Eu 0.18Tb 0.19Gd 0.63Al 3(BO 3) 4 compositions were determined by single crystal and powder X-ray diffraction methods. The monoclinic crystals with different compositions have identical structures with space group C2/c. It was concluded that the starting crystallization temperature was the dominant factor in formation of the rhombohedral and monoclinic phases. The crystals with non-centrosymmetric rhombohedral structure (R32) may possess similar compositions as the previous ones but their starting crystallization temperature was lower.

Original languageEnglish
Pages (from-to)72-76
Number of pages5
JournalJournal of Crystal Growth
Volume351
Issue number1
DOIs
Publication statusPublished - Jul 15 2012

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Keywords

  • A1. Crystal structure
  • A1. X-ray diffraction
  • A2. Single crystal growth
  • A2. Top seeded solution growth
  • B1. Borates
  • B1. Rare earth compounds

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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