Structural and spectroscopic study of a single crystal of lanthanum aluminogallate, doped with neodymium

Kahn, A; LeComte, J; Thery, J; Vivien, D

doi:10.1016/0022-4596(88)90207-1

Title: Structural and spectroscopic study of a single crystal of lanthanum aluminogallate, doped with neodymium

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Abstract

The structure and optical properties of a neodymium activated lanthanum aluminogallate are described. This compound exhibits a promising laser behavior (5% Nd content, 1.059 and 1.08 ..mu..m fluorescence radiations, average lifetime of the Nd/sup 3 +/ ion excited state about 330 ..mu..s). The Czochralski grown single crystals have a hexagonal magnetoplumbite-like structure with space group P6/sub 3//mmc, Z = 2, a = 5.673(2) A, c = 22.32(1) A and are shown to be nonstoichiometric (final R factor = 0.033, R/sub w/ = 0.038). The composition deduced from the structure refinement of the studied crystal is La/sub 0.84/Nd/sub 0.04/Mg/sub 0.64/Al/sub 5.27/Ga/sub 6.13/O/sub 19/. Aluminum and gallium are not randomly distributed on the available sites of the structure; Gas is rather found on tetrahedral or pseudo-tetrahedral sites, whereas Al is mainly sixfold coordinated. This has an effect on Nd/sup 3 +/ crystal field by increasing the Ln-Ln distances. The Ln deficiency (approx. 0.9 instead of 1) is balanced by excess Al. Ln(La + Nd) is split on two sites with different local symmetry. This is suggested by the X-ray structural investigation and confirmed by V-UV absorption and ESR spectroscopy, which reveal the occupation of both an axial 2d site (D/sub 3h/, aboutmore »« less

Authors:: Kahn, A; LeComte, J; Thery, J; Vivien, D

Publication Date:: Thu Sep 01 00:00:00 EDT 1988

Research Org.:: CNRS, Paris (France)

OSTI Identifier:: 6810484

Resource Type:: Journal Article

Journal Name:: J. Solid State Chem.; (United States)

Additional Journal Information:: Journal Volume: 76:1

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; ALUMINIUM COMPOUNDS; CRYSTAL STRUCTURE; GALLIUM OXIDES; LANTHANUM COMPOUNDS; NEODYMIUM COMPOUNDS; CATIONS; CRYSTAL GROWTH; ELECTRON SPIN RESONANCE; EXPERIMENTAL DATA; HEXAGONAL LATTICES; MONOCRYSTALS; NEODYMIUM ADDITIONS; NMR SPECTRA; SPACE GROUPS; ALLOYS; CHALCOGENIDES; CHARGED PARTICLES; CRYSTAL LATTICES; CRYSTALS; DATA; GALLIUM COMPOUNDS; INFORMATION; IONS; MAGNETIC RESONANCE; NEODYMIUM ALLOYS; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; RARE EARTH ADDITIONS; RARE EARTH ALLOYS; RARE EARTH COMPOUNDS; RESONANCE; SPECTRA; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies; 360204 - Ceramics, Cermets, & Refractories- Physical Properties

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                    Kahn, A, LeComte, J, Thery, J, and Vivien, D. Structural and spectroscopic study of a single crystal of lanthanum aluminogallate, doped with neodymium.  United States: N. p., 1988. 
        Web.  doi:10.1016/0022-4596(88)90207-1.

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                    Kahn, A, LeComte, J, Thery, J, & Vivien, D. Structural and spectroscopic study of a single crystal of lanthanum aluminogallate, doped with neodymium.  United States.  https://doi.org/10.1016/0022-4596(88)90207-1

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                    Kahn, A, LeComte, J, Thery, J, and Vivien, D. 1988.  
        "Structural and spectroscopic study of a single crystal of lanthanum aluminogallate, doped with neodymium".  United States.  https://doi.org/10.1016/0022-4596(88)90207-1.

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@article{osti_6810484,

  title        = {Structural and spectroscopic study of a single crystal of lanthanum aluminogallate, doped with neodymium},

  author       = {Kahn, A and LeComte, J and Thery, J and Vivien, D},

  abstractNote = {The structure and optical properties of a neodymium activated lanthanum aluminogallate are described. This compound exhibits a promising laser behavior (5% Nd content, 1.059 and 1.08 ..mu..m fluorescence radiations, average lifetime of the Nd/sup 3 +/ ion excited state about 330 ..mu..s). The Czochralski grown single crystals have a hexagonal magnetoplumbite-like structure with space group P6/sub 3//mmc, Z = 2, a = 5.673(2) A, c = 22.32(1) A and are shown to be nonstoichiometric (final R factor = 0.033, R/sub w/ = 0.038). The composition deduced from the structure refinement of the studied crystal is La/sub 0.84/Nd/sub 0.04/Mg/sub 0.64/Al/sub 5.27/Ga/sub 6.13/O/sub 19/. Aluminum and gallium are not randomly distributed on the available sites of the structure; Gas is rather found on tetrahedral or pseudo-tetrahedral sites, whereas Al is mainly sixfold coordinated. This has an effect on Nd/sup 3 +/ crystal field by increasing the Ln-Ln distances. The Ln deficiency (approx. 0.9 instead of 1) is balanced by excess Al. Ln(La + Nd) is split on two sites with different local symmetry. This is suggested by the X-ray structural investigation and confirmed by V-UV absorption and ESR spectroscopy, which reveal the occupation of both an axial 2d site (D/sub 3h/, about 80%) and a nonaxial satellite 6h position (C/sub 2v/, about 10%). This is consistent with previous results obtained for hexaaluminates and hexagallates.},

  doi          = {10.1016/0022-4596(88)90207-1},

  url          = {https://www.osti.gov/biblio/6810484},
  journal      = {J. Solid State Chem.; (United States)},
number       = ,

  volume       = 76:1,

  place        = {United States},

  year         = {Thu Sep 01 00:00:00 EDT 1988},

  month        = {Thu Sep 01 00:00:00 EDT 1988}

}

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