Flux growth and liquid phase epitaxy of undoped and Mn6+-doped sulfates, tungstates, and molybdates

Y.E. Romanyuk, D. Ehrentraut, S. Kück, Markus Pollnau

    Research output: Contribution to conferencePaperAcademicpeer-review

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    Abstract

    The Mn6+ ion is a promising activator ion for tunable and short-pulse laser materials because of its broadband luminescence in the spectral region 850-1600 nm and its simple 3d1 electronic configuration, which excludes an occurrence of undesirable exited-state absorption into higher 3d levels. However, hexavalent manganese can be stabilized only in the tetrahedral oxo-coordination and easily reduces to Mn5+ or Mn4+ at temperatures above 600°C. Recently, flux [1] and liquid-phase epitaxy (LPE) [2] growth of Mn6+-doped sulfates has been reported, while except for BaMoO4:Mn6+ [3] investigations on the mechanically more stable alkaline-earth-metal molybdates and tungstates as possible host materials for efficient Mn6+ incorporation have as yet not been reported. We investigated the growth conditions of undoped and Mn6+-doped MAO4, with M = Ca, Sr, Ba and A = S, Mo, W, from the ternary NaCl-KCl-CsCl solvent at temperatures 480-600°C. The growth rates increase in the series tungstates < molybdates < sulfates and depending on the cation, in the series Ca < Sr < Ba. The dopant ion Mn6+ can be easily incorporated into BaSO4, less well into BaMoO4 and BaWO4, whereas for Ca- and Sr-containing tungstates and molybdates no significant doping was found, independent on the concentration of Mn6+ in the liquid solution. Moreover, reduction of the Mn6+ ion cannot be avoided, even at the presence of oxidizing additives such as K2CO3 or NaOH. LPE was employed for growing Mn6+-doped layers of BaAO4 compounds. Growth velocities of 3-5 µm/h in the temperature interval from 490-540°C from chloridic solution, containing 0.3-1mol% of K2MnO4 with respect to the solute, delivered dark-pink BaSO4 and slightly green BaMoO4 and BaWO4 layers up to 200 µm in thickness. With respect to high Mn6+ doping levels, BaSO4 is the most suitable host material and its further investigation under different initial concentrations of manganese is currently underway. [1] T.C. Brunold, H.U. Güdel, Inorg. Chem. 36, 1946 (1997). [2] D. Ehrentraut, M. Pollnau, Appl. Phys. B 75, 59 (2002). [3] T.C. Brunold, H.U. Güdel, Chem. Phys. Lett. 249, 77 (1996).
    Original languageUndefined
    Pages82-83
    Number of pages1
    Publication statusPublished - Jul 2003

    Keywords

    • IR-72122
    • IOMS-APD: Active Photonic Devices
    • EWI-18050

    Cite this

    Romanyuk, Y. E., Ehrentraut, D., Kück, S., & Pollnau, M. (2003). Flux growth and liquid phase epitaxy of undoped and Mn6+-doped sulfates, tungstates, and molybdates. 82-83.
    Romanyuk, Y.E. ; Ehrentraut, D. ; Kück, S. ; Pollnau, Markus. / Flux growth and liquid phase epitaxy of undoped and Mn6+-doped sulfates, tungstates, and molybdates. 1 p.
    @conference{3c1d242b04be468db311e7a27aef533a,
    title = "Flux growth and liquid phase epitaxy of undoped and Mn6+-doped sulfates, tungstates, and molybdates",
    abstract = "The Mn6+ ion is a promising activator ion for tunable and short-pulse laser materials because of its broadband luminescence in the spectral region 850-1600 nm and its simple 3d1 electronic configuration, which excludes an occurrence of undesirable exited-state absorption into higher 3d levels. However, hexavalent manganese can be stabilized only in the tetrahedral oxo-coordination and easily reduces to Mn5+ or Mn4+ at temperatures above 600°C. Recently, flux [1] and liquid-phase epitaxy (LPE) [2] growth of Mn6+-doped sulfates has been reported, while except for BaMoO4:Mn6+ [3] investigations on the mechanically more stable alkaline-earth-metal molybdates and tungstates as possible host materials for efficient Mn6+ incorporation have as yet not been reported. We investigated the growth conditions of undoped and Mn6+-doped MAO4, with M = Ca, Sr, Ba and A = S, Mo, W, from the ternary NaCl-KCl-CsCl solvent at temperatures 480-600°C. The growth rates increase in the series tungstates < molybdates < sulfates and depending on the cation, in the series Ca < Sr < Ba. The dopant ion Mn6+ can be easily incorporated into BaSO4, less well into BaMoO4 and BaWO4, whereas for Ca- and Sr-containing tungstates and molybdates no significant doping was found, independent on the concentration of Mn6+ in the liquid solution. Moreover, reduction of the Mn6+ ion cannot be avoided, even at the presence of oxidizing additives such as K2CO3 or NaOH. LPE was employed for growing Mn6+-doped layers of BaAO4 compounds. Growth velocities of 3-5 µm/h in the temperature interval from 490-540°C from chloridic solution, containing 0.3-1mol{\%} of K2MnO4 with respect to the solute, delivered dark-pink BaSO4 and slightly green BaMoO4 and BaWO4 layers up to 200 µm in thickness. With respect to high Mn6+ doping levels, BaSO4 is the most suitable host material and its further investigation under different initial concentrations of manganese is currently underway. [1] T.C. Brunold, H.U. G{\"u}del, Inorg. Chem. 36, 1946 (1997). [2] D. Ehrentraut, M. Pollnau, Appl. Phys. B 75, 59 (2002). [3] T.C. Brunold, H.U. G{\"u}del, Chem. Phys. Lett. 249, 77 (1996).",
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    author = "Y.E. Romanyuk and D. Ehrentraut and S. K{\"u}ck and Markus Pollnau",
    year = "2003",
    month = "7",
    language = "Undefined",
    pages = "82--83",

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    Romanyuk, YE, Ehrentraut, D, Kück, S & Pollnau, M 2003, 'Flux growth and liquid phase epitaxy of undoped and Mn6+-doped sulfates, tungstates, and molybdates' pp. 82-83.

    Flux growth and liquid phase epitaxy of undoped and Mn6+-doped sulfates, tungstates, and molybdates. / Romanyuk, Y.E.; Ehrentraut, D.; Kück, S.; Pollnau, Markus.

    2003. 82-83.

    Research output: Contribution to conferencePaperAcademicpeer-review

    TY - CONF

    T1 - Flux growth and liquid phase epitaxy of undoped and Mn6+-doped sulfates, tungstates, and molybdates

    AU - Romanyuk, Y.E.

    AU - Ehrentraut, D.

    AU - Kück, S.

    AU - Pollnau, Markus

    PY - 2003/7

    Y1 - 2003/7

    N2 - The Mn6+ ion is a promising activator ion for tunable and short-pulse laser materials because of its broadband luminescence in the spectral region 850-1600 nm and its simple 3d1 electronic configuration, which excludes an occurrence of undesirable exited-state absorption into higher 3d levels. However, hexavalent manganese can be stabilized only in the tetrahedral oxo-coordination and easily reduces to Mn5+ or Mn4+ at temperatures above 600°C. Recently, flux [1] and liquid-phase epitaxy (LPE) [2] growth of Mn6+-doped sulfates has been reported, while except for BaMoO4:Mn6+ [3] investigations on the mechanically more stable alkaline-earth-metal molybdates and tungstates as possible host materials for efficient Mn6+ incorporation have as yet not been reported. We investigated the growth conditions of undoped and Mn6+-doped MAO4, with M = Ca, Sr, Ba and A = S, Mo, W, from the ternary NaCl-KCl-CsCl solvent at temperatures 480-600°C. The growth rates increase in the series tungstates < molybdates < sulfates and depending on the cation, in the series Ca < Sr < Ba. The dopant ion Mn6+ can be easily incorporated into BaSO4, less well into BaMoO4 and BaWO4, whereas for Ca- and Sr-containing tungstates and molybdates no significant doping was found, independent on the concentration of Mn6+ in the liquid solution. Moreover, reduction of the Mn6+ ion cannot be avoided, even at the presence of oxidizing additives such as K2CO3 or NaOH. LPE was employed for growing Mn6+-doped layers of BaAO4 compounds. Growth velocities of 3-5 µm/h in the temperature interval from 490-540°C from chloridic solution, containing 0.3-1mol% of K2MnO4 with respect to the solute, delivered dark-pink BaSO4 and slightly green BaMoO4 and BaWO4 layers up to 200 µm in thickness. With respect to high Mn6+ doping levels, BaSO4 is the most suitable host material and its further investigation under different initial concentrations of manganese is currently underway. [1] T.C. Brunold, H.U. Güdel, Inorg. Chem. 36, 1946 (1997). [2] D. Ehrentraut, M. Pollnau, Appl. Phys. B 75, 59 (2002). [3] T.C. Brunold, H.U. Güdel, Chem. Phys. Lett. 249, 77 (1996).

    AB - The Mn6+ ion is a promising activator ion for tunable and short-pulse laser materials because of its broadband luminescence in the spectral region 850-1600 nm and its simple 3d1 electronic configuration, which excludes an occurrence of undesirable exited-state absorption into higher 3d levels. However, hexavalent manganese can be stabilized only in the tetrahedral oxo-coordination and easily reduces to Mn5+ or Mn4+ at temperatures above 600°C. Recently, flux [1] and liquid-phase epitaxy (LPE) [2] growth of Mn6+-doped sulfates has been reported, while except for BaMoO4:Mn6+ [3] investigations on the mechanically more stable alkaline-earth-metal molybdates and tungstates as possible host materials for efficient Mn6+ incorporation have as yet not been reported. We investigated the growth conditions of undoped and Mn6+-doped MAO4, with M = Ca, Sr, Ba and A = S, Mo, W, from the ternary NaCl-KCl-CsCl solvent at temperatures 480-600°C. The growth rates increase in the series tungstates < molybdates < sulfates and depending on the cation, in the series Ca < Sr < Ba. The dopant ion Mn6+ can be easily incorporated into BaSO4, less well into BaMoO4 and BaWO4, whereas for Ca- and Sr-containing tungstates and molybdates no significant doping was found, independent on the concentration of Mn6+ in the liquid solution. Moreover, reduction of the Mn6+ ion cannot be avoided, even at the presence of oxidizing additives such as K2CO3 or NaOH. LPE was employed for growing Mn6+-doped layers of BaAO4 compounds. Growth velocities of 3-5 µm/h in the temperature interval from 490-540°C from chloridic solution, containing 0.3-1mol% of K2MnO4 with respect to the solute, delivered dark-pink BaSO4 and slightly green BaMoO4 and BaWO4 layers up to 200 µm in thickness. With respect to high Mn6+ doping levels, BaSO4 is the most suitable host material and its further investigation under different initial concentrations of manganese is currently underway. [1] T.C. Brunold, H.U. Güdel, Inorg. Chem. 36, 1946 (1997). [2] D. Ehrentraut, M. Pollnau, Appl. Phys. B 75, 59 (2002). [3] T.C. Brunold, H.U. Güdel, Chem. Phys. Lett. 249, 77 (1996).

    KW - IR-72122

    KW - IOMS-APD: Active Photonic Devices

    KW - EWI-18050

    M3 - Paper

    SP - 82

    EP - 83

    ER -