碘化钇为白色晶体,具有吸湿性,易溶于水,并且能够溶解于乙醇和丙酮中,微溶于乙醚。
应用在陶瓷领域,碘化钇可用于磨料、轴承和密封件、连续铸造浇口的高温耐火材料、喷漆引擎涂层、发动机氧传感器以及耐磨耐蚀切割工具。
制备将碘化氢与氢气的混合气体通入氯化钇中,在600℃条件下进行碘化反应,直至完全反应后改用氦气除去吸附气体。另一种方法是取氧化钇溶于氢碘酸中,然后加入碘化铵,并进一步加入浓氢碘酸以制备碘化钇。
用途碘化钇可作为低温制备YBCO超导材料的原料之一。此外,它还用于固态合成新型化合物Y21I18C14B7,这是首例包含具有错配特征间隙卤素原子的稀土金属卤化物。
The title compounds were synthesized from RE, REI3 (RE = Ce, Gd, Y) and Al or Ga under an Ar atmosphere at 930 - 950 °C. The non-stoichiometric Ce2+xI2Al2+y and Ce2+xI2Ga2+y compounds crystallize in the space group R3̄m (No. 166) with lattice constants a = 4.3645(3), c = 35.914(2) Å for the Al and a = 4.3009(2), c = 35.680(4) Å for the Ga compound. Excess electron density found in the Wyckoff position 3a could be due to a fractional occupation by Ce or M (x = 0.06, y = 0 or x = 0, y = 0.11 in the case of the Ga compound). The stoichiometric Gd2I2Ga2 and Y2I2Ga2 compounds crystallize in the space group P3̄m1 (No. 164) with lattice constants a = 4.1964(1) and 4.1786(7) Å , c = 11.4753(4) and 11.434(2) Å , respectively. Their structures feature M-centered (M = Al, Ga) RE trigonal prisms condensed via common rectangular faces. The electronic origin of the surplus of metal atoms in the octahedral voids between the I-layers of the Ce compounds was explored via extended Hückel-type calculations. Magnetic susceptibility, electrical resistivity and heat capacity measurements have also been carried out. These reveal a metal-insulator transition of Gd2I2Ga2 at 40 K.