Growth and Electric Properties of Al-Substituted Langasite-Type La₃Ta_0.5Ga_5.5O₁₄ Crystals at High Temperature

Abstract:

We report an effective substitution of aluminum for gallium in langasite-type La3Ta0.5Ga5.5O14 (LTG) crystals for use in a pressure sensor at high temperature. Al-substituted LTG (La3Ta0.5Ga5.5-xAlxO14; LTGAx) single crystals up to the solubility limit of x=0.5 have been grown by the conventional Czochralski technique. The electric properties of the LTGAx crystals were investigated and compared with those of LTG. By Al substitution, the piezoelectric constant d11 and the electromechanical coupling factors (k12) became slightly larger. The LTGAx crystals showed a lower temperature dependence of d11 and a higher electric resistivity ρ than those of the LTG crystals.

• Periodical: Key Engineering Materials (Volume 320)
• Pages: 239-242
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.320.239
• Online since: September 2006
• Authors: Hiroaki Takeda, Satoshi Tanaka, Hiroyuki Shimizu, Takashi Nishida, Tadashi Shiosaki
• Keywords: Combustion Pressure Sensor Material, Electric Resistivity, Piezoelectric Constant, Substitution Effect, Temperature Coefficient

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DOI: 10.1016/s0022-0248(00)00440-1

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[5] [6] [7] [8] [9] [10] [11] [12] [13] [14] 150 200 400 600 800 logρ ρ ρ ρ [Ω [Ω [Ω [Ω �cm] Temperature [oC] LTG LTGA0. 5 Fig. 5 Temperature dependences of electric resistivity ρof the Y-cut LTG and LTGA0. 5 crystals.

[5] [6] [7] [8] [9] [10] [11] [12] [13] [14] 150 200 400 600 800 logρ ρ ρ ρ [Ω [Ω [Ω [Ω �cm] Temperature [oC] LTG LTGA0. 5 Fig. 5 Temperature dependences of electric resistivity ρof the Y-cut LTG and LTGA0. 5 crystals.