【摘要】 本文通过 X 光结构分析、化学分析研究了熔体生长的 TII 晶体中杂质对其结构相变的影响。结果表明:TIBr、CsI 和 PbI₂、SnI₂杂质分别以取代固溶体和键合成新化合物的方式进入碘化铊晶体之中,从而影响 TlI 晶体的结构相变。离子性较强的 TlBr 和 CsI 杂质使 TlI 的立方相不发生相变,生成室温下稳定的固溶体晶体;共价性较强的 PbI₂、SnI₂杂质和 TlI 形成类似于正交相 TII的固液同成份化合物 TlPbI₃、TlSnI₃。更多还原

【Abstract】 Effect of impurities on the structural phase transition in TlIgrown by melting method was investigated by X-ray,chemical analyses.Itis found that impurities TlBr,CsI and PbI₂,SnI₂ are doped in TlI crystals bysubstitution and bonding respectively,and have a great effect on the structu-ral phase transition in TlI.TlBr and CsI which have stronger ionicity than TlIprevent the cubic phase transition in TlI crystal and produce stabilized solidsolution crystals in roon temperature.PbI₂ and SnI₂ which have strongercovalency than TlI and it combinate to form TlPbI₃,TlSnI₃ compounds respe-ctively,that similar to TlI orthorhombic phase in structure and properties.更多还原