The anisotropic thermal expansion of BiB3O6 (BIBO) has been studied in the temperature range 25 °C to 299.5 °C. The three values of principal expansion coefficients α1, α2, and α3 and the orientation of the principal axes are −26.43×10−6 K−1, 50.4×10−6 K−1, 8.53×10−6 K−1, and 8.9°, respectively. Large anisotropic thermal expansion will cause thermal stress, leading to crystal fracture and the formation of parasitic crystallites along the direction of crystal grain growth. The results obtained from transmission electron microscopy support the evidence observed from the measurements of expansion. This may be useful for BIBO crystal growth.
Li 2 O·3B 2 O 3 or Li 2 O.B 2 O 3 / 3 (LOBO) crystallizes in the orthorhombic space group Pna2 1 with cell parameters a = 0.73788(6), b = 0.84473(7) and c = 0.51395(5) nm and two formula units in the primitive cell. Raman results show that the characteristic spectra of LOBO are mainly contributed by particularly the B(3) -O tetrahedra and also the B(1) -O and B(2) -O triangles and partly ascribed to the breathing vibrations of the B -O rings. The structural rigidity of LOBO is associated with all B -O bond stretching and bending of especially the B(3) -O bonds. The excellent non-linear optical properties of LOBO are mainly attributed to the more anionic groups in the primitive cell and their deviations from the T d or D 3h symmetry. The short ultraviolet absorption edge is mainly attributable to the tilt of the B -O rings. The lattice thermal vibrations show that the anisotropically thermal conductivity is outstanding especially along the c direction.
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