温升速率对用于DD/DT核反应的LiTaO_(3)晶体热释电特性影响研究  

Characteristic of a LiTaO_(3)crystal with heating velocity used DD/DT fusion

作　　者：刘猛[1] 林菊芳[1] 言杰[1] 柯建林[1] LIU Meng;LIN Jufang;YAN Jie;KE Jianlin(Institute of Nuclear Physics and Chemistry,CAEP,Mianyang,621900,China)

机构地区：[1]中国工程物理研究院核物理与化学研究所,绵阳621999

出　　处：《核电子学与探测技术》2025年第3期299-302,共4页Nuclear Electronics & Detection Technology

摘　　要：在真空环境中作为热释电晶体的LiTaO_(3)晶体极化可产生百kV的电压,该电压可用于加速氘离子轰击氘靶或氚靶,产生聚变中子。为了提高LiTaO_(3)晶体热释电性能,通过改变晶体的温升速率,测量了尺寸为Φ2 cm×2 cm的LiTaO_(3)晶体表面电压的关系,得到了晶体表面电压与温升速率之间的关系。实验发现,在温升速率为4.7 K/min时产生的电压最高,为126 kV。同时修正了Fullem等人的模型,修正后的模型计算结果与实验结果相吻合。The LiTaO_(3)crystal has an intrinsic spontaneous polarization under equilibrium condition.The change in the polarization will produce some surface electric charges on both faces of the crystal when the crystal is heated or cooled in vacuum.When the potential induced by surface electric charges on faces of the crystal is relativdy large,which can be used to achieve DD/DT fusion through acceleration of deuterium ions into a deuterated(tritiated)target.To increase the maximal acceleration potential achieved with a LiTaO_(3)pyroelectric crystal,we measured the potential of aΦ2cm×2cm LiTaO_(3)crystal at different heat velocity by monitoring the energy of x⁃ray spectrum generated by interaction of the emitted electrons with target.The maximum energy of x⁃ray continuum spectrum indicates the maximum energy of emitted electrons which is the electric potential of the crystal surface.The relationship between the maximal potential and the heat velocity was obtained.Furthermore,Fullem’s model was modified,and the calculational result by the modified model was consistent with the experimental result.It was found that the maximal potential was 126kV with heat velocity of 4.7 K/min forΦ2 cm×2 cm LiTaO_(3)crystal.

关 键 词：D-D核反应 温升速率 LiTaO_(3)晶体 最大电压 

分 类 号：TL503[核科学技术—核技术及应用]