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On the structure and optical band gap in (Bi2O3)(0.2)(BaO)(x)(B2O3)(0.8-2x)(GeO2)(x) glasses
Authors: Tichá Helena | Schwarz Jiří | Tichý Ladislav
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Journal of Optoelectronics and Advanced Materials
Publisher name: National Institute of Optoelectronics
Place: Bukurešť
Page from-to: 1020-1025
Titles:
Language Name Abstract Keywords
cze Struktura a optický gap skel systému (Bi2O3)(0.2)(BaO)(x)(B2O3)(0.8-2x)(GeO2)(x) Nová skla systému (Bi2O3) (0,2) (BaO) (x) (B2O3) (0,8-2x) (GeO2) (x) byla připravena z čistých oxidů. Teploty skelného přechodu se snížily z 489 na 460 ° C, s nárůstem x z 0,05 na 0,3, současně se koeficient tepelné roztažnosti zvýšil z 7,3 na 9,6 ppm ° C-1. Optický šířka zakázaného pásu byla stanovena v oblasti 3,84 (x = 0,05) - 3,54 eV pro x = 0,3, bylo zjištěno, že součinitel teplotní závislosti optického gapu pro teploty mezi 30 a 250 ° C v úzké oblasti 3,3 x 10 (-4) - 4 x 10 (-4) eVK(-1) a nelineární index lomu studovaných skel byl odhadnut z hodnot optického gapu kolem 6,9 x 10 (-11) esu. Na základě Ramanovy spektroskopie byla diskutována struktura studovaných skel. oxidová skla; Ramanova spektroskopie; optické vlastnosti
eng On the structure and optical band gap in (Bi2O3)(0.2)(BaO)(x)(B2O3)(0.8-2x)(GeO2)(x) glasses New (Bi2O3)(0.2)(BaO)(x)(B2O3)(0.8-2x)(GeO2)(x) glasses were prepared from pure oxides. The glass transition temperatures decreased from 489 to 460 degrees C with the increase in x from 0.05 to 0.3, simultaneously the coefficient of thermal expansion increased from 7.3 to 9.6 ppm degrees C-1. The optical band gap was determined in the region 3.84 (x = 0.05) - 3.54 eV for x = 0.3, the coefficient of the temperature dependence of the optical gap for the temperatures between 30 and 250 degrees C was found in the narrow region 3.3 x 10(-4) - 4 x 10(-4) eVK(-1) and the non-linear refractive index of the studied glasses was estimated from the optical gap values at around 6.9 x 10(-11) esu. Possible structural arrangement of the glasses prepared as indicated by Raman spectroscopy was discussed. oxide glasses; Raman spectroscopy; optical properties

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