کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1482715 | 1510495 | 2010 | 6 صفحه PDF | دانلود رایگان |
Optical properties and structural aspects of AsxS100-x glasses from visible to terahertz wavelengths were explored. A series of annealed, bulk AsxS100-x glasses (x = 30 to 42) were made and their refractive indices determined at terahertz, infrared, and visible frequencies using a quasi-optical backwards wave oscillator spectrometer for terahertz measurements combined with a prism coupler for visible and infrared measurements. It was found that the refractive index at all frequencies increases with arsenic composition up to 40 at.% arsenic and then decreases with additional arsenic. The structure in X-ray diffraction patterns supports the notion of a minimum volume at 40 at.%, while the average covalent coordination number indicates that the rigidity percolation threshold is reached there. At arsenic concentrations >40 at.%, the network becomes over-constrained, and the molar volume increases.
Journal: Journal of Non-Crystalline Solids - Volume 356, Issues 25–27, 1 June 2010, Pages 1288–1293