Acta Phys. -Chim. Sin. ›› 2014, Vol. 30 ›› Issue (2): 227-231.doi: 10.3866/PKU.WHXB201312161

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

Thermal and Mechanical Properties of Nd3+/Yb3+ Co-Doped Titanate Glass with Upconversion Emissions

YU Hui-Mei1,2, PAN Xiu-Hong1, ZHANG Ming-Hui1, LIU Yan1, YU Jian-Ding1   

  1. 1 Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China;
    2 Energy Institute, Pennsylvania State University, Pennsylvania 16802, USA
  • Received:2013-09-13 Revised:2013-12-13 Published:2014-01-23
  • Contact: PAN Xiu-Hong E-mail:xhpan@mail.sic.ac.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (21005083), Visiting Scholarship Fund of Chinese Academy of Sciences (201198), Program of Scientific Equipment Development of Chinese Academy of Sciences (YZ201142), and Innovative Found of Shanghai Institute of Ceramics, Chinese Academy of Sciences (Y17ZC1160G).

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Abstract:

In the present work, Nd3+/Yb3+ co-doped TiO2-La2O3-ZrO2 (TLZ) glasses which were previously prepared by the aerodynamic levitation method were characterized by thermal differential analysis (DTA) and micro-hardness tests. The DTA technique was used to study the thermal stability of the characteristic temperatures, the glass transition temperature (Tg), the crystallization onset temperature (Tc), and the crystallization peak temperature (Tp), of the rare earth doped titanate glasses. The thermal kinetic DTA-analysis of the Nd3+/Yb3+ co-doped TLZ glasses was studied at heating rates of 5, 10, 15, 20 K·min-1. The activation energy (Ea) and the pre-exponential factor (A) were obtained by the Kissinger and Friedman methods. In addition, the Vickers hardness was higher than 7.50 GPa and fracture toughness was higher than 1.20 MPa· m1/2 for all the investigated TLZ glasses by the micro- hardness test. Furthermore, the upconversion luminescence property was investigated at 808 nm laser excitation, and three intense upconversion emission bands were observed. The excellent upconversion fluorescence, good thermal stability, and high mechanical strength suggested that this class of materials has potential for practical application in frequency upconversion devices.

Key words: Thermal stability, Mechanical property, Upconversion emission, Titanate glass, Levitation method