非孪晶一维量子自旋系统Lix Cu2 O2的Li非化学计量比和晶体生长
Li non-stoichiometry and crystal growth of untwinned 1D quantum spin system Lix Cu2 O2
摘要：
本文报道了高Li含量（x ~ 0.99）的Li_xCu_2O_2非孪晶单晶的浮区生长。用碘量滴定法和热重法相结合的方法准确地测定了Li_xCu_2O_2中Li的含量，并排除了Li与Cu之间化学无序的推测。比较了缓冷法（SL）和浮区法（FZ）单晶的形貌和物理性能。Ar/O_2=7：1混合气体在0.64 MPa下进行浮区生长，得到大面积的非孪晶晶体，其Li含量最高，在Li_xCu_2O_2体系中具有最低的螺旋磁有序温度~ 19 K。
英文摘要：
Floating-zone growth of untwinned single crystal of Li_xCu_2O_2 with high Li content of x ~ 0.99 is reported. Li content of Li_xCu_2O_2 has been determined accurately through combined iodometric titration and thermogravimetric methods, which also ruled out the speculation of chemical disorder between Li and Cu ions. The morphology and physical properties of single crystals obtained from slowing-cooling (SL) and floating-zone (FZ) methods are compared. The floating-zone growth under Ar/O_2=7:1 gas mixture at 0.64 MPa produces large area of untwinned crystal with highest Li content, which has the lowest helimagnetic ordering temperature ~19K in the Li_xCu_2O_2 system.
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