Wang Dandan, Zhang Xinyuan, Gong Pifu, Lin Zheshuai, Hu Zhanggui, Wu Yicheng
Tianjin Key Laboratory of Functional Crystal Materials, Institute of Functional Crystals, Tianjin University of Technology, Tianjin 300384, China.
Huace Eco Environmental Technology (Tianjin) Company, Ltd., Tianjin 300399, China.
Inorg Chem. 2023 May 1;62(17):6565-6569. doi: 10.1021/acs.inorgchem.3c00868. Epub 2023 Apr 17.
The synthesis conditions at high temperature and high pressure are favorable for exploring new compounds with novel structures and properties. In this work, a new polar iodate, ε-La(IO), is obtained by a supercritical hydrothermal method with high temperature and high pressure ( = 400 °C and ≈ 25 MPa). Different from the known phases, ε-La(IO) crystallizes in the chiral space group 2, which features a three-dimensional framework with multiple IO groups stacked along different directions around the LaO polyhedra. ε-La(IO) possesses high thermal stability up to 525 °C and exhibits a wide band gap of about 4.05 eV. Attributed to its noncentrosymmetric arrangement, ε-La(IO) is second-harmonic-generation (SHG)-active and the powder SHG response is measured to be 11.1 × KHPO at 1064 nm in the 26-50 μm particle size range. This work has enriched the structural diversity of iodates and would further promote the materials' exploration under a supercritical hydrothermal method.
高温高压的合成条件有利于探索具有新颖结构和性质的新化合物。在本工作中，通过高温高压超临界水热法（温度 = 400 °C，压力≈25 MPa）获得了一种新的极性碘酸盐ε-La(IO)。与已知相不同，ε-La(IO) 结晶于手性空间群2，其特征是具有三维骨架，多个IO基团围绕LaO多面体沿不同方向堆叠。ε-La(IO) 在高达525 °C时具有高的热稳定性，并且表现出约4.05 eV的宽带隙。由于其非中心对称排列，ε-La(IO) 具有二次谐波产生（SHG）活性，在26 - 50 μm粒径范围内，1064 nm处的粉末SHG响应测量值为11.1×KHPO。这项工作丰富了碘酸盐的结构多样性，并将进一步推动超临界水热法下的材料探索。
