Growth of MBO3 (M = La, Y, Sc) and LaSc3(BO3)4 crystals from LiBO2-LiF fluxes

Three-Cation Scandium Borates RxLa1−XSc3(BO3)4(R = Sm, Tb): Synthesis, Structure, Crystal Growth and Luminescent Properties

“…The authors (He et al 1999) distinguish three modifications of this crystal: high-temperature monoclinic with the C2/c space group, medium temperature trigonal with the R32 space group (huntitelike) and low-temperature monoclinic with the Cc space group. As a result of our research (Fedorova et al 2013) identity of the X-ray patterns of polymorphic modifications high and low was shown.…”

Growth of the complex borates YxRySc2+z(BO3)4 (R = Nd, Pr, x + y + z = 2) with huntite structure

“…To grow of PrYSB and NdYSB crystals we used the flux of eutectic composition of the LiBO 2 –LiF system with 59 mol.% LiBO 2 , melting temperature 725°C. This flux was shown to be prospective for the growth of rare earth borate crystals . H 3 BO 3 , LiF, Li 2 CO 3 , Y 2 O 3 , Sc 2 O 3 , Pr 2 O 3 of not lower than 3N purity were used as a source material.…”

Crystallochemical Design of Huntite-Family Compounds

“…Single crystals with the initial composition LnSc 3 (BO 3 ) 4 with the Ln = La [74,75], Ce [81], Pr [80,88], Nd [77,80,88], Sm [80,88], Eu [88], obtained by the flux method (the NdSc 3 (BO 3 ) 4 were grown by the Czochralski method [77]), and also with the Ln = Gd [36,37] and Y [36,37], grown by the TSSG method, have a modification with the huntite structure (space group R32) (Figures 1 and 2). Fedorova et al [78] as well as Li et al [25] and Ye et al [31] could not obtain a stable modification of LaSc 3 (BO 3 ) 4 with the space group R32 by solid state reaction (LaSc 3 (BO 3 ) 4 samples with the space group C2/c have been obtained) and by a high-temperature solution method, respectively, suggesting that this phase seems to be metastable or stable in a narrow temperature range. It should be noted that the space group R32 for the LnSc 3 (BO 3 ) 4 with the Ln = La [74,75], Ce [81], Pr [88], Nd [77,88], Sm [88], Eu [88] is determined by the single crystal XRD study, whereas for the Ln = Gd, (Y), the space group R32 is stated in [36,37] without any experimental confirmation, noting only that single crystals grown by the TSSG method exhibited well developed facets having the form of rhombohedral prisms characteristic of the space group R32.…”

“…Fedorova et al [78], based on a complete correspondence (the space groups C2/c and Cc belong to the same diffraction symmetry group with the same extinction laws) of the diffraction patterns of powdered α-LaSc 3 (BO 3 ) 4 (space group C2/c) and γ-LaSc 3 (BO 3 ) 4 (space group Cc), obtained by solid state synthesis and heat-treated at temperatures from 1000 to 1350 • C, concluded that the LaSc 3 (BO 3 ) 4 crystallizes in the space group C2/c. The experiment described does not allow choosing one of two space groups correctly.…”