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- W1574607805 abstract "La/sub 3/Ga/sub 5/SiO/sub 14/ (LGSO) crystals grown from stoichiometric starting material are characterized by the absorption band edge in the UV-region at wavelengths beginning with /spl lambda/=0.29 /spl mu/m, the existence of absorption bands with /spl lambda//sub max/=0.36, 2.9, 3.75 /spl mu/m, as well as by /spl rho/>10/sup 12/ Ohm*cm, /spl epsi//sub y/ 623 K in electric field with E>400 V/cm. In this case /spl rho/ decreases by 100-1000 times, tg/spl delta/ increased by an order. The band at /spl lambda/=0.58 /spl mu/m disappears if the colored samples are annealed in hydrogen at 973 K and is restored by heating the colorless samples in oxygen or air above 1173 K; the intensity of the absorption band of the OH-group (/spl lambda/=2.9 /spl mu/m) changes. The variation of crystal composition (Ga or Si), as well as the introduction of Al or Ti ions in LGSO do not result in the emergence of absorption in the red region. However, in this case the character of absorption in the UV-region noticeably changes. Recommendations for obtaining transparent crystals are given." @default.
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- W1574607805 date "2002-11-19" @default.
- W1574607805 modified "2023-09-25" @default.
- W1574607805 title "The nature of langasite crystal's coloration" @default.
- W1574607805 doi "https://doi.org/10.1109/freq.1995.484065" @default.
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