Thermal expansion of the monoclinic nonlinear optical crystal BiB₃O₆ (bismuth triborate) was measured by dilatometry within the temperature range from 173 K to 573 K using single crystal samples of dimensions ≈7 x 7 x 8 mm³. The four independent tensor coefficients are given and the calculated loci of zero thermal expansion of BiB₃O₆ are related to the loci of phase matching for second harmonic generation. Characteristic features of the crystal structure are taken to discuss the marked anisotropy of thermal expansion of BiB₃O₆.

Keywords: borate, BiB3O6, thermal expansion, nonlinear optical crystal

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