Ti{sub 2}GaC, Ti{sub 4}GaC{sub 3} and Cr{sub 2}GaC-Synthesis, crystal growth and structure analysis of Ga-containing MAX-phases M{sub n+1}GaC{sub n} with M=Ti, Cr and n=1, 3

Journal Article · Fri May 15 04:00:00 EDT 2009 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2009.01.003· OSTI ID:21370368

Etzkorn, Johannes; Ade, Martin; Kotzott, Dominik ^[1]; Kleczek, Monique ^[2]; Hillebrecht, Harald ^[1]

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1. Institut fuer Anorganische und Analytische Chemie, Albert-Ludwigs-Universitaet Freiburg, Albertstrasse 21, D-79104 Freiburg (Germany)
2. University of Toronto (Canada)

Single crystals of Ga-containing MAX-phases Ti{sub 2}GaC, Ti{sub 4}GaC{sub 3}, and Cr{sub 2}GaC were grown from a metallic melt generated by an excess of Ga. This technique allows the crystal growth at different temperatures to control the product distribution. Compounds developed were Ti{sub 2}GaC and TiC at 1500 deg. C, and Ti{sub 2}GaC and Ti{sub 4}GaC{sub 3} at 1300 deg. C. Crystal structures were refined from single crystal data. Ti{sub 2}GaC and Cr{sub 2}GaC were previously known, and belong to the Cr{sub 2}AlC type as well as the solid solutions V{sub 2}Ga{sub 1-x}Al{sub x}C and Cr{sub 2}Ga{sub 1-x}Al{sub x}C. Ti{sub 4}GaC{sub 3} is one of the few 413-phases (P6{sub 3}/mmc, a=3.0690(4) A, c=23.440(5) A) and the first Ga-containing representative. The crystal structures of MAX-phases are intergrowths of layers of an intermetallic MGa in a hexagonal stacking sequence with carbidic layers (MC){sub n} of the NaCl type. The thickness of the layer depends from the value of n. The results of the structure refinements also demonstrate that also the structural details follow this description. - Graphical abstract: Single crystals of Ga-containing MAX-Phases (TiC){sub n}(TiGa) (n=1, 3) were grown from a metallic melt including and characterised by X-ray diffraction. Ti{sub 4}GaC{sub 3} is one of the few 413-phase and the first containing Ga.

• OSTI ID: 21370368
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 5 Vol. 182; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
CARBIDES
CARBON COMPOUNDS
CHROMIUM COMPOUNDS
COHERENT SCATTERING
CRYSTAL GROWTH
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
DISPERSIONS
GALLIUM COMPOUNDS
HCP LATTICES
HEXAGONAL LATTICES
HOMOGENEOUS MIXTURES
LAYERS
MIXTURES
MONOCRYSTALS
SCATTERING
SOLID SOLUTIONS
SOLUTIONS
SPECTROSCOPY
SYNTHESIS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
TITANIUM CARBIDES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
X-RAY SPECTROSCOPY