研究目的
To clarify the reason for the green color of the NaGd(WO4)2 crystals by analyzing the effect of uncontrollable impurities on their optical properties.
研究成果
The green color encountered in NaGd(WO4)2 crystals in some cases is due to the uncontrollable impurities of d elements, among which the chromium impurity has the most significant effect. Further studies are needed to confirm these findings.
研究不足
The study focused on the effect of uncontrollable impurities on the optical properties and color of NaGd(WO4)2 crystals. The conclusions about the role of chromium in the formation of green color need to be confirmed by further studies of luminescent characteristics, including the measurements of luminescence decay kinetics and EPR.
1：Experimental Design and Method Selection:
The study involved growing NaGd(WO4)2 single crystals by the Czochralski method using charges of different chemical purity. The impurity compositions were analyzed by inductively coupled plasma mass spectrometry (ICP-MS) and spark mass spectrometry (SMS). The optical absorption spectra were measured within a wavelength range of 300–2000 nm.
2：Sample Selection and Data Sources:
Three NaGd(WO4)2 single crystals were grown using charges of different chemical purity. The impurity compositions of the initial reagents and the grown crystals were analyzed.
3：List of Experimental Equipment and Materials:
A Kristall-2 growth setup, a platinum-rhodium crucible, a Sartorius analytical balance, a NexION 300D ICP-MS, a JMS-01-BM2 mass spectrometer, and a Cary 5000 spectrophotometer were used.
4：Experimental Procedures and Operational Workflow:
The crystals were grown in the air, cooled to room temperature at a rate of 10 K/h, and their impurity compositions and optical absorption spectra were analyzed.
5：Data Analysis Methods:
The impurity concentrations and optical absorption spectra were analyzed to determine the effect of uncontrollable impurities on the optical properties and color of the crystals.
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