Effect of the state of the surface layers on the strength of materials for optoelectronic and sensors devices

• Опубліковано в: : Semiconductor Physics Quantum Electronics & Optoelectronics
• Дата: 2008
• Автор: Maslov, V.P.
• Формат: Стаття
• Мова: Англійська
• Опубліковано: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2008
• Онлайн доступ: https://nasplib.isofts.kiev.ua/handle/123456789/119047
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Цитувати: Effect of the state of the surface layers on the strength of materials for optoelectronic and sensors devices / V.P. Maslov // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2008. — Т. 11, № 3. — С. 286-291. — Бібліогр.: 19 назв. — англ.

The goal of this work is to determine the correlation of the strength of brittle
 amorphous nonmetallic materials with the defective surface layers and their physical
 properties. The defective surface layer of materials for optoelectronic and sensors devices
 consists of abundant structural near-surface defects, which are displaced under action of
 constant load and thermal fluctuations, reducing the elasticity of the surface layer.
 Microcreep processes in tested materials can be described by a general equation that is
 known as the logarithmic microcreep equation. The applicability of this equation for
 tested optical materials is indicative of the generality of microcreep processes in
 crystalline and amorphous hard materials. For each grade of polished optical glass, a
 minimal residual defective layer exists. The parameters of this layer are interrelated with
 the mechanical properties of glass, such as microhardness and optical strain coefficient,
 and thermophysical properties, such as thermal diffusivity, sintering temperature, and
 annealing temperature. The greater are the values of these properties, the less is the
 concentration of disrupted interatomic bonds. Based on the test results, the corresponding
 equation, using the parameter E⋅a¹/², for determining the strength of optical silicate glass
 and glassceramic has been proposed.