Raman measurement and thermal properties of SmCa4O(BO3)3 crystals

H. R. Xia, G. W. Lu, Shujun Zhang, Z. X. Cheng

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Abstract

SmCa4O(BO3)3 (SCOB) crystallizes in the noncentrosymmetric monoclinic space group Cm with cell parameters a = 0.8129(5), b = 1.6076(1), c = 0.3584(1) nm, β = 101.36(2)°, and Z = 2. Raman results showed that the characteristic spectra of SCOB are mainly contributed by the B-O triangles and partly by the Ca(1)-O octahedra. The structural rigidity of SCOB is mainly ascribed to the B-O bond stretching and bending modes and partly by the Ca(1)-O bonds. The rigid structure of the B-O triangles and the quasi-rigid structure of the Ca(1)-O octahedra are necessary to the SCOB crystal as a laser host. The large distortions of the Sm-O and Ca(2)-O octahedra intensify the polar forces and anisotropic lattice forces, which generally imply the best nonlinear properties possible for SCOB as a nonlinear optical material and piezocrystal. Thermal measurements show a larger value of the specific heat and three small expansion coefficients, which show that SCOB can allow a large temperature gradient, especially in the Y direction. Displacement parameters indicated that the thermal ellipsoids of the Sm and Ca(2) atoms had significantly large components along the b direction. Synthetical study indicated that the SCOB crystal should be outstanding as an efficient self-frequency doubled material.

Original languageEnglish (US)
Pages (from-to)2465-2470
Number of pages6
JournalJournal of Materials Research
Volume17
Issue number9
DOIs
StatePublished - Jan 1 2002

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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