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Triclinic Pedial Sarcosinium Hydrogen l(+)‐Tartrate—Crystal Growth, Pyroelectricity, Thermal Expansion, and Linear Optical Properties
Crystal Research and Technology ( IF 1.169 ) Pub Date : 2019-06-11 , DOI: 10.1002/crat.201900040
Ladislav Bohatý; Lkhamsuren Bayarjargal; Lionel Andersen; Peter Held; Petra Becker

Single crystals of optical quality and dimensions up to 25 × 25 × 40 mm3 of sarcosinium hydrogen l(+)‐tartrate and up to 15 × 20 × 30 mm3 of sarcosinium hydrogen d(−)‐tartrate are grown from aqueous solution during growth periods of 10–14 weeks. For sarcosinium hydrogen l(+)‐tartrate refractive indices and their dispersion in the wavelength range 365–1083 nm are determined. The biaxial positive crystals show marked optical anisotropy with maximum birefringence at 365 nm of Δn = 0.089 and only small orientation dispersion of the principal axes of the optical indicatrix. Based on the linear optical data, phase matching conditions for collinear second harmonic generation (SHG) are analyzed. The optical properties allow SHG phase matching for both, type I and type II processes. Temperature‐dependent coefficients of the tensor of thermal expansion [αij] between 145 and 300 K show pronounced anisotropy and moderate orientation dispersion of thermal expansion, with principal values at 293 K of α 11 0 = −3.3(1) × 10−6 K−1, α 22 0 = 35.7(1) × 10−6 K−1, and α 33 0 = 66.6(1) × 10−6 K−1. The absolute value of the pyroelectric vector |pσ| of sarcosinium hydrogen l(+)‐tartrate amounts to about 20 µC K−1 m−2 and varies only slightly with temperature in the temperature range 100–320 K.
更新日期:2020-02-12

 

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