Rb₃Na(H₂C₃N₃O₃)₄·3H₂O with Large Birefringence

Area of Science:

• Materials Science
• Crystallography
• Nonlinear Optics

Background:

• Nonlinear optical (NLO) materials are crucial for optical technologies.
• Developing new NLO crystals with enhanced properties is an ongoing research area.

Purpose of the Study:

• To synthesize a novel mixed alkali-metal dihydro-cyanurate crystal.
• To investigate the optical and electronic properties of Rb3Na(H2C3N3O3)4·3H2O.
• To evaluate its potential for ultraviolet (UV) birefringent applications.

Main Methods:

• Hydrothermal synthesis method for crystal preparation.
• Experimental characterization of optical properties (birefringence, UV cutoff).
• Powder second harmonic generation (SHG) measurement.
• First-principles calculations for electronic structure and NLO properties.

Main Results:

• Successfully synthesized Rb3Na(H2C3N3O3)4·3H2O via hydrothermal method.
• Observed large calculated birefringence (approx. 0.368).
• Determined UV cutoff edge at 230 nm.
• Measured powder SHG intensity of 0.2 × KDP.
• First-principles calculations showed good agreement with experimental band gap and SHG coefficients.

Conclusions:

• Rb3Na(H2C3N3O3)4·3H2O is a promising new nonlinear optical material.
• Its large birefringence and UV transparency suggest suitability for UV birefringent applications.
• The synthesized crystal demonstrates potential for use in advanced optical devices.