Abstract CaMoO4 crystal is a promising scintillator for investigating the neutrinoless double beta decay process and is commonly grown by the Czochralski method. In this study, CaMoO4 single crystals were grown by the vertical Bridgman method using both spontaneous crystallization and seed crystal approaches. The CaMoO4 crystal grown using the spontaneous crystallization approach exhibited yellow, light blue, and deep blue colours (from top to middle part of the ingot). The thermal expansion coefficients, αa and αc, were calculated to be 6.11 × 10−5/°C, and 23.58 × 10−5/°C, respectively. The optical transmission spectra and photo- and thermally stimulated luminescence spectra of the crystals before and after thermal annealing were also investigated. The yellow cubic CaMoO4 crystal showed the highest x-ray-stimulated luminescence intensity and the best light output under the excitation of a 137Cs radioactive source.

中文翻译：

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垂直布里奇曼法生长的 CaMoO 4 晶体的热膨胀、发光和闪烁特性

摘要 CaMoO4 晶体是一种很有前途的闪烁体，用于研究中微子双β 衰变过程，通常采用直拉法生长。在这项研究中，CaMoO4 单晶是通过垂直布里奇曼方法使用自发结晶和晶种方法生长的。使用自发结晶方法生长的 CaMoO4 晶体呈现黄色、浅蓝色和深蓝色（从锭的顶部到中部）。计算得出的热膨胀系数 αa 和 αc 分别为 6.11 × 10-5/°C 和 23.58 × 10-5/°C。还研究了热退火前后晶体的光学透射光谱和光和热激发发光光谱。