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

Fingerprint

Borates
Gadolinium
gadolinium
borates
Aluminum
Crystallization
aluminum
Crystals
Chemical analysis
crystallization
crystals
X ray powder diffraction
Temperature
Single crystals
single crystals
diffraction
x rays
temperature

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
  • Materials Chemistry
  • Inorganic Chemistry

Cite this

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title = "Polytypic modifications in heavily Tb and Eu doped gadolinium aluminum borate crystals",
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.",
keywords = "A1. Crystal structure, A1. X-ray diffraction, A2. Single crystal growth, A2. Top seeded solution growth, B1. Borates, B1. Rare earth compounds",
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T1 - Polytypic modifications in heavily Tb and Eu doped gadolinium aluminum borate crystals

AU - Beregi, E.

AU - Sajó, I.

AU - Lengyel, K.

AU - Bombicz, P.

AU - Czugler, M.

AU - Földvári, I.

PY - 2012/7/15

Y1 - 2012/7/15

N2 - 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.

AB - 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.

KW - A1. Crystal structure

KW - A1. X-ray diffraction

KW - A2. Single crystal growth

KW - A2. Top seeded solution growth

KW - B1. Borates

KW - B1. Rare earth compounds

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