High-Resolution Graphite Furnace Atomic Absorption Spectrometry Determination of Bismuth in Lithium Niobate Optical Crystals.

ABSTRACT: High-resolution continuum source graphite furnace atomic absorption spectrometry (HR-CS-GFAAS) methods with solid and solution sampling were developed for the determination of the Bi dopant in high-purity lithium niobate (LiNbO₃) crystals. Samples were cut from the cylindrical crystal bulks, cleaned, and pulverized. A HF-HNO₃ mixture was applied for microwave digestion of LiNbO₃ (≈0.07 g per sample). Atomization transients, pyrolysis, and atomization curves were studied with various media and chemical modifiers, e.g., triammonium citrate (TAC), Pd-Mg-(NO₃)₂. For solid samples, the optimal pyrolysis and atomization temperatures of Bi were found at 1000 and 1800 °C, respectively, whereas, for solution samples, much lower values of 500 an

SUBMITTER: Csontos D 

PROVIDER: S-EPMC12529150 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature