Abstract
The hydrothermal synthesis and crystal growth of LiLuF4 were investigated. Small crystals of LiLuF4 were produced but while investigating various alkali fluoride mineralizers, a new series of alkali lithium lutetium fluorides, including, LiKLuF5 and LiNaLu2F8, were synthesized under hydrothermal conditions (570 °C at 12.5 kpsi). The mineralizer KF leads to formation of a new compound LiKLuF5 crystallized in the space group C2/m with the lattice parameters a = 6.2328(12), b = 11.709(2), c = 6.3986(13), β = 113.87(3). Tm and Yb analogs were also synthesized using the same conditions. Use of NaF as mineralizer leads to a new compound LiNaLu2F8, crystallized in space group Cmcm, a = 10.3181(21), b = 8.2393(16), c = 6.9565(14). Several doped compounds were also isolated and electronic spectra were obtained.
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