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High-Resolution Graphite Furnace Atomic Absorption Spectrometry Determination of Bismuth in Lithium Niobate Optical
Dániel Csontos1, László Kovács1, Krisztián Lengyel1
1Department of Applied and Nonlinear Optics, Institute for Solid State Physics and Optics, HUN-REN Wigner Research Centre for Physics, P.O. Box 49, H-1525 Budapest, Hungary.
Developed high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS-GFAAS) methods accurately determine bismuth (Bi) dopant in high-purity lithium niobate (LiNbO3) crystals. These methods offer precise quantification of Bi content, crucial for advanced material applications.
Area of Science:
- Analytical Chemistry
- Materials Science
Background:
- High-purity lithium niobate (LiNbO3) crystals are essential in advanced optical and electronic applications.
- Accurate determination of dopant concentrations, such as bismuth (Bi), is critical for controlling crystal properties.
Purpose of the Study:
- To develop and validate high-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS-GFAAS) methods for Bi determination in LiNbO3.
- To compare solid and solution sampling techniques for Bi analysis in LiNbO3.
Main Methods:
- Microwave digestion of LiNbO3 samples using a HF-HNO3 mixture.
- Optimization of pyrolysis and atomization temperatures with chemical modifiers (TAC, Pd-Mg-(NO3)2).
- Application of standard addition and three-point estimation for calibration.
Main Results:
- Achieved limits of detection (LOD) as low as 0.03 μg/g for solid sampling and 0.3 μg/g for solution sampling.
- Demonstrated good agreement between methods (mean bias <12%) and acceptable precision (6-16% for solid, 1-13% for solution).
- Quantified Bi content in LiNbO3 crystals ranging from 56 to 311 μg/g.
Conclusions:
- HR-CS-GFAAS methods are suitable for accurate and precise Bi determination in LiNbO3.
- Solid sampling offers a lower LOD, while solution sampling provides higher precision.
- The developed methods contribute to quality control and material development of LiNbO3 crystals.
