Ultrasonic Study on Effects of Ultraviolet Irradiation on α-alanine Doped Triglycine Sulphate

• Main Authors: Yu-Fen Chang, 張瑜芬
• Other Authors: Cheng Tien
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/00241440952377752633

碩士 === 國立成功大學 === 物理學系碩博士班 === 91 === In our work, we constructed an ultrasonic system for studying the lattice structure of materials. We measured the velocity and the attenuation of ultrasound in α-alanine doped triglycine sulphate (shortly α-alanine-TGS) in the room temperature region and in the phase transition region. We found notable differences between the behavior of α-alanine-TGS and pure TGS, and they conform to the cited references. After applying ultraviolet irradiation, we measured the velocity and the attenuation of ultrasound in α-alanine-TGS in the phase transition region. The attenuation anomaly with respect to the temperature was without change, and the change of the magnitude of the velocity anomaly had no particular tendency. The phase transition temperature Tc of α-alanine-TGS crystal was not affected when the ultraviolet energy density reached 9379 (J/cm^2). We found that the width of the velocity anomaly increases with the irradiation energy density. This phenomenon is similar to the case of ferroelectrics being exposed to γ-irradiation.