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Journal of Advanced Ceramics 2022, 11(3): 470-481 https://doi.org/10.1007/s40145-021-0551-5
Research Article | Open Access | Issue | Published: 12 January 2022

Novel transparent MgGa2O4 and Ni2+-doped MgGa2O4 ceramics

Show Author's Information Guangran ZHANGa,  Adrian GOLDSTEINb,  Yiquan WUa( )
Kazuo Inamori School of Engineering, New York State College of Ceramics, Alfred University, Alfred, New York 14802, USA
Israel Ceramic and Silicate Institute, Haifa, Israel
Keywords:
transparent ceramics, spinel, magnesium gallate (MgGa2O4), pulsed electric current sintering (PECS)
Cite this article:
ZHANG G, GOLDSTEIN A, WU Y. Novel transparent MgGa2O4 and Ni2+-doped MgGa2O4 ceramics. Journal of Advanced Ceramics, 2022, 11(3): 470-481. https://doi.org/10.1007/s40145-021-0551-5
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Abstract Full text About this article

In this study we fabricated, for the first time, magnesium gallate (MgGa2O4, a partially inverted spinel) transparent ceramics, both undoped and doped with 1 at% Ni. The specimens were derived from in-house prepared powder, with a crystallite size of ~10 nm (by wet chemistry) and densified by pulsed electric current sintering (PECS; peak temperature 950 ℃ for 90 min). Densification levels of 99.84% and 99.52% of theoretical density were attained for doped and undoped materials, respectively. Doping with Ni was seen to marginally improve the densification level. Quite transparent specimens were produced: the best showing transmission of ~89% of the theoretical level (thickness t = 0.85 mm). The absorption spectra revealed that the dopant was accumulated as Ni2+ in the octahedral sites of the lattice, as occurs in single-crystal specimens. After excitation at 980 nm, the doped disks exhibited a wide fluorescence band centered at 1264 nm.


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About this article

Novel transparent MgGa2O4 and Ni2+-doped MgGa2O4 ceramics

Show Author's information Guangran ZHANGa, Adrian GOLDSTEINb, Yiquan WUa( )
Kazuo Inamori School of Engineering, New York State College of Ceramics, Alfred University, Alfred, New York 14802, USA
Israel Ceramic and Silicate Institute, Haifa, Israel

Abstract

In this study we fabricated, for the first time, magnesium gallate (MgGa2O4, a partially inverted spinel) transparent ceramics, both undoped and doped with 1 at% Ni. The specimens were derived from in-house prepared powder, with a crystallite size of ~10 nm (by wet chemistry) and densified by pulsed electric current sintering (PECS; peak temperature 950 ℃ for 90 min). Densification levels of 99.84% and 99.52% of theoretical density were attained for doped and undoped materials, respectively. Doping with Ni was seen to marginally improve the densification level. Quite transparent specimens were produced: the best showing transmission of ~89% of the theoretical level (thickness t = 0.85 mm). The absorption spectra revealed that the dopant was accumulated as Ni2+ in the octahedral sites of the lattice, as occurs in single-crystal specimens. After excitation at 980 nm, the doped disks exhibited a wide fluorescence band centered at 1264 nm.

Keywords: transparent ceramics, spinel, magnesium gallate (MgGa2O4), pulsed electric current sintering (PECS)

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Publication history
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Publication history

Received: 11 August 2021
Revised: 16 October 2021
Accepted: 01 November 2021
Published: 12 January 2022
Issue date: March 2022

Copyright

© The Author(s) 2021.

Acknowledgements

The authors gratefully acknowledge the National Science Foundation CAREER Grant (No. 1554094) and Office of Naval Research (No. N00014-17-1-2548) for funding this research. Part of this material (Raman data) is based upon work supported by the National Science Foundation (No. DMR-1626164).

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