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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2021, Vol. 40 ›› Issue (11): 3791-3798.

• Glass • Previous Articles     Next Articles

Preparation and Optical Properties of Co2+-Doped ZnO-MgO-Al2O3-SiO2 System Glass-Ceramics

ZHANG Tao1, HOU Zhengzheng1, JING Tao2, LI Sheng1, GUO Yanxing1, JIAO Zhiwei1   

  1. 1. College of Mechanical and Material Engineering, North China University of Technology, Beijing 100144, China;
    2. Gansu Solid Waste and Chemicals Center, Lanzhou 730020, China
  • Received:2021-05-17 Revised:2021-06-01 Online:2021-11-15 Published:2021-12-08

Abstract: In this paper, transparent glass-ceramics of the Co2+-doped ZnO-MgO-Al2O3-SiO2 (ZMAS) system were prepared via melting method and heat-treatment. Based on the X-ray diffraction results, it determine that the main crystalline phase of glass-ceramics is ZnAl2O4/MgAl2O4, and the composition of the glass-ceramics don't change significantly with the increase of the crystallization treatment time. The crystallinity and the average grain size of spinel increase first and then decrease. It shows that the broad absorption band of 4T1(4F)→4A2(4F) transitions and the emission peak of 4T1(4P)→4A2(4F) transitions of tetracoordinated Co2+ do not appear in both the absorption spectra and emission spectra of glass-ceramics. This indicates that Co2+ enter the spinel phase ZnAl2O4/MgAl2O4 and replace Zn2+ or Mg2+ in the tetrahedral (Td) sites. With the increase of crystallization treatment time, the absorption spectral intensity and emission spectral intensity of the samples increase first and then decrease. This is consistent with the changing trend of X-ray diffraction results. It shows that the optical properties can be controlled by controlling the crystallinity of glass-ceramics, which has certain guiding significance for the preparation of glass-ceramics with good properties. Comparing the glass-ceramics prepared by using raw materials with different valence states of Co oxides the result shows that the element Co exists as divalent Co2+ in the spinel phase of the final glass-ceramics, whether it is doped with CoO or Co2O3. Moreover, the prepared glass-ceramics material was compared with other Co-doped matrix materials in terms of the ground state absorption cross section (σgas) at 1 540 nm, showing that it can be used as a saturable absorber in Q-switch lasers.

Key words: glass-ceramic, spinel, Co2+-doped, saturable absorber, crystallization behavior

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