Abstract
Undoped Li3Lu3Ba2(MoO4)8 monoclinc (C2/c) single crystals, as well as crystals doped with Tm or Ho and codoped with Tm and Ho, have been grown by the top seeded solution growth method using Li2MoO4 as the solvent. A convenient growth flux was found for the solute/solvent molar composition of 1:5; for this, the growth temperature interval was ≈1073–1053 K, with a cooling rate of 0.05 K/h. The crystal shape is controlled by the seed orientation, and a- and b-oriented seeds give rise to near rectangular cross sections while c-oriented seeds produce rhombohedral cross sections. The grown crystals are deficient in Li with regard to the nominal formula. Li and Lu (Tm, Ho) ions share the same 8f crystal site with occupancy factors near 0.2 and 0.8, respectively. The relationships between the crystallographic and physical frames of some crystal properties (thermal expansion, refractive indices, and optical absorption) are determined as well as the specific heat and thermal conductivity (along a- and b-crystal axes). Perspectives for application of these disordered crystals as mode-locked ultrafast laser media are discussed.
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