新型长波红外非线性晶体PbIn₆Te₁₀具有透光波段宽（1.3~31 μm）、非线性系数大（d₁₁=51 pm/V），双折射适宜（~0.05）等优点，在14~25 μm乃至25 μm以上波段具有较大应用潜力。文中通过相图分析结合具体实验，筛选出较合适的组分配比，并采用高温单温区法合成多晶，布里奇曼法生长出尺寸φ11 mm×55 mm的单晶棒。对生长的PbIn₆Te₁₀晶体进行X射线衍射、摇摆曲线、透过率等测试，结果表明，晶体为三方结构，晶格常格为a=b=1.496 1 nm，c=1.825 7 nm，生长出的单晶结晶性较好，半高宽（FHWM）约0.253°，2.5~25 μm波段晶体的平均透过率在50%以上，对应收系数处于0.3~0.6 cm^?1之间。

The new far-IR nonlinear crystal material PbIn₆Te₁₀ has great application potential among 14-25 μm even more than 25 μm because of its special optical properties, including clear transparency(1.3-31 μm), large nonlinear coefficient(d₁₁=51 pm/V) and suitable birefringence(~0.05). The phase diagram analysis combined with the experiment was used to select the appropriate group distribution ratio, the PbIn₆Te₁₀ polycrystal was synthesized by high temperature single-temperature zone method(STZM), and single crystal with size of φ11 mm×55 mm was grown by Bridgman Method. The as-grown crystals were characterized by X-ray diffraction, X-ray rocking curve, infrared transmittance et al. XRD analysis indicates that the crystal has a trigonal structure, the lattice constants of a, b and c are 1.496 1 nm and 1.825 7 nm, respectively. The as-grown crystal is crystallized well (FHWM=0.253°), the infrared transmission is above 50% in the spectral region of 2.5-25 μm, the coefficient is 0.3-0.6 cm^?1.