Title :
Sweeping investigations on grown-in Al-Li+ and Al-OH centers in natural crystalline quartz
Author_Institution :
Nat. Phys. Lab., New Delhi, India
Abstract :
Near-infrared absorption in the region of 3100-3700 cm-1 is used to study a variety of optically clear samples of natural quartz crystals. The crystals are hydrogen-rich and hydrogen-lean with approximately the same or varying aluminium concentration. The alkali concentration in hydrogen-rich samples is much higher than that in hydrogen-lean samples. The very narrow variation in the strength of centers in all small samples suggests that Al-OH- centers in natural quartz become stable only after a certain maximum Al-Li+ concentration. This concentration appears to be independent of the origin of the growth and reflects a characteristic feature of the growth mechanism of natural quartz crystals
Keywords :
OH--centres; impurity and defect absorption spectra of inorganic solids; infrared spectra of inorganic solids; point defects; quartz; 3100 to 3700 cm-1; alkali concentration; centers; crystalline quartz; growth mechanism; hydrogen-lean crystals; hydrogen-rich crystals; near-IR absorption; optically clear samples; Aerospace industry; Aerospace materials; Aluminum; Crystalline materials; Crystallization; Crystals; Impurities; Oscillators; Protons; Stability;
Conference_Titel :
Frequency Control Symposium, 1992. 46th., Proceedings of the 1992 IEEE
Conference_Location :
Hershey, PA
Print_ISBN :
0-7803-0476-4
DOI :
10.1109/FREQ.1992.270048
