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<p>The semi-organic nonlinear optical crystal L-alanine potassium iodate (LAPI) was grown from slow evaporation solution growth method at room temperature using water as solvent. The lattice parameters of the grown crystal have been determined from X-ray diffraction studies and revealed that the successfully grown crystal belongs to cubic system. Vibrational spectrum was carried out to determine the symmetries of molecular vibrations. The presence of various functional groups of L-alanine potassium iodate (LAPI) was identified through FT-IR spectroscopic technique. These functional groups are assigned, discussed and confirmed with the data available. The optical transmission spectral study confirmed the transmitting ability of the synthesized crystal in the entire visible region having the recorded range of 190–1100&#xa0;nm. The analyses of optical, linear, absorption, and transmission curves were carried out to identify the lower cut-off transmission and also to enumerate the optical band gap energy and found. The experimentally grown crystals were also subjected to TGA/DTA analysis to explain its thermal stability. Vickers microhardness test was used to evaluate the mechanical parameters and hence to obtain the hardness of the investigated crystal. The second harmonic generation (SHG) test of the grown crystal confirmed the nonlinear nature of the crystal. The fluorescence spectral study of the synthesized crystal was used to determine the energy gap derived from the difference between excitation and emission photon energies and this crucial parameter characterizes the luminescent materials.</p>

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Crystal growth, structural, spectral, mechanical, and nonlinear optical properties of L-alanine potassium iodate (LAPI) single crystals

  • 期刊论文

  • 发表日期：

    2026年2月22日

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  • R. Kayalvizhi Kothai,
  • S. Anand,
  • R. Durga,
  • K. Rajkumar,
  • S. Sri Karthick

摘要

The semi-organic nonlinear optical crystal L-alanine potassium iodate (LAPI) was grown from slow evaporation solution growth method at room temperature using water as solvent. The lattice parameters of the grown crystal have been determined from X-ray diffraction studies and revealed that the successfully grown crystal belongs to cubic system. Vibrational spectrum was carried out to determine the symmetries of molecular vibrations. The presence of various functional groups of L-alanine potassium iodate (LAPI) was identified through FT-IR spectroscopic technique. These functional groups are assigned, discussed and confirmed with the data available. The optical transmission spectral study confirmed the transmitting ability of the synthesized crystal in the entire visible region having the recorded range of 190–1100 nm. The analyses of optical, linear, absorption, and transmission curves were carried out to identify the lower cut-off transmission and also to enumerate the optical band gap energy and found. The experimentally grown crystals were also subjected to TGA/DTA analysis to explain its thermal stability. Vickers microhardness test was used to evaluate the mechanical parameters and hence to obtain the hardness of the investigated crystal. The second harmonic generation (SHG) test of the grown crystal confirmed the nonlinear nature of the crystal. The fluorescence spectral study of the synthesized crystal was used to determine the energy gap derived from the difference between excitation and emission photon energies and this crucial parameter characterizes the luminescent materials.