Thermal conductivity/diffusivity of Nd3+ doped GdVO4, YVO4, LuVO4, and Y3Al5O12 by temperature wave analysis

DOI PDF 被引用文献14件
  • Junko Morikawa
    Tokyo Institute of Technology 1 , 2-12-1, s8-29, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
  • Ceelia Leong
    Tokyo Institute of Technology 1 , 2-12-1, s8-29, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
  • Toshimasa Hashimoto
    Tokyo Institute of Technology 1 , 2-12-1, s8-29, O-okayama, Meguro-ku, Tokyo 152-8550, Japan
  • Takayo Ogawa
    RIKEN (The Institute of Physical and Chemical Research) 2 , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • Yoshiharu Urata
    RIKEN (The Institute of Physical and Chemical Research) 2 , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • Satoshi Wada
    RIKEN (The Institute of Physical and Chemical Research) 2 , 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • Mikio Higuchi
    Hokkaido University 3 Graduate School of Engineering, , N13, W8, Kita-Ku, Sapporo, Hokkaido 060-8628, Japan
  • Jun-ichi Takahashi
    Hokkaido University 3 Graduate School of Engineering, , N13, W8, Kita-Ku, Sapporo, Hokkaido 060-8628, Japan

書誌事項

公開日
2008-03-15
DOI
  • 10.1063/1.2899181
公開者
AIP Publishing

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<jats:p>Thermal diffusivity and thermal conductivity of single crystals of Nd3+ doped GdVO4, YVO4, LuVO4, and Y3Al5O12 are precisely measured over a wide range of doping concentration from 0.5to15at.% by temperature wave analysis. Thermal diffusivity serves as the most sensitive parameter to detect the effect of doping on thermal properties, where Nd3+ doped GdVO4 exhibits a decrease in thermal diffusivity (it has changed about 20% in their values in the c axis) but an increase in heat capacity (only 1.7%). It has long been understood that the thermal conductivity of YVO4 is inferior to that of Y3Al5O12; however, the thermal conductivity of YVO4 in the c axis shows the highest value in all four crystals compared at 1at.% of Nd3+ doping concentration. Thermal conductivity exhibits a decrease (∝ε−1∕2, ε: mass variance) with an increase of doping concentration, that is characteristic of Klemens’ point defect model for the phonon scattering. In the numerical fitting, the anisotropic decrease of thermal conductivity in different crystal axes, [100], [001], and [110], is reflected as the different phonon velocities. The simulated and the experimental thermal conductivity show the various decreasing curvatures indicating that the effect of mass difference of the host and the doping cations serves as an important factor, as with the crystallographic anisotropy, on the thermal conductivity of the doped single crystals.</jats:p>

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