【摘要】 采用熔盐法从PbF₂—PbO—B₂O₃三元系高温溶液中生长出掺Cr³⁺的BeAl₂O₄单晶,通过严格控制降温速率（约2℃/小时）和熔剂成份的摩尔比值（45P_bF₂:45P_bO:10B₂O₃）获得了尺寸达10×4.5×4.5mm³的块状透明晶体。 在5K.77K和300K不同温度下测量了Cr³⁺:BeAl₂O₄单晶的非偏振吸水谱、荧光谱和激发谱（T=300K）,首次由实验确定出在C_1h低对称场微扰下Cr³⁺离子的²T₁和²T₂能级分裂出的三个亚能级的位置。更多还原

【Abstract】 The flux growth of Alexandrite single crystals from PbF₂-PbO-B₂O₃ solutions is described. Samples of excellent optical quality （up to 10×4.5×4.5mm³） have been obtaine under conditions of 2⁰ C/hr cooling rate and 45 PbF₂:45PbO:10B₂O₃ flux composition.Absorption spectrum of Alexandrite （T=5k, 77k and 300k） and their fluorescence spectrum （T=300k）, excitation spectrum （T=300k）were also measured. At first time, the positions of three sub-levels respectively spliting out from ²T₁ and ²T₂ levels of Cr³⁺ ion under disturbance of C_1h low crystal field were determinated by spectroscopic experimental results."Projects Supported by the Science Fund of the Chinese Academy of Sciences.更多还原