Publication Date:
2011-12-02
Description:
Gamma radiation is known to induce changes in physical, optical, and structural properties in chalcogenide glasses, but previous research has focused on As 2 S 3 and families of glasses containing Ge . For the first time, we present composition and dose dependent data on the As–S binary glass series. Binary As x S 100−x ( x = 30, 33, 36, 40, and 42) glasses were irradiated with gamma radiation using a 60 Co source at 2.8 Gy/s to accumulated doses of 1, 2, 3, and 4 MGy. The irradiated samples were characterized at each dose level for density, refractive index, X-ray diffraction (XRD), and Raman spectrum. We report an initial increase in density followed by a decrease as a function of dose that contradicts the expected compositional dependence of molar volume of these glasses. This unusual behavior is explained based on microvoid formation and nanoscale phase-separation induced by the irradiation. XRD, Raman, and electron spin resonance data provide supporting evidence, underscoring the importance of optimally- or overly constrained structures for stability under irradiation.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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