Electrical and optical measurements on fused quartz under shock compression
نویسندگان
چکیده
The resistivities of specimens of Si02 (fused quartz) singly and doubly shocked in the i0 to 45 and 27 to 90 GPa range, respectively, demonstrate a marked decrease from values of ~10~'m to ~0.1~'m at single shock pressure of ~40 and double shock pressure of ~74 GPa. The shock-induced polarization profiles also show a sudden change of electrical properties of the material at those pressures. The rapid decrease in resistivity suggests a further transformation to an unknown phase or production of an electron bound level.
منابع مشابه
Electrical measurements on fused quartz under shock compression
The resistivities of specimens ofSi02 (fused quartz) singly and doubly shocked in the 10-45 and 27-90 GPa ranges, respectively, demonstrate a marked decrease from values of10-0.1 11-m at a single-shock pressure of -40 and a double-shock pressure of 7 4 G Pa. These states correspond to calculated shock temperatures of3300 and -3600 K, respectively. At shock pressures below 36 GPa the measured re...
متن کاملShock temperature measurements in Mg2SiO4 and SiO2 at high pressures
Temperatures in the high pressure shock state have been determined by measurement of optical radiation from pure samples of forsteritc (Mg2 SiOn), a-quartz, and fused silica. Shock waves of known amplitude were produced by tantalum flyer impact using a two-stage light gas gun. Shock pressures in the ranges 150-175 GPa and 70-115 GPa for Mg: SiOn and SiO2 respectively were achieved, and temperat...
متن کاملEffect of window reflections on photonic Doppler velocimetry measurements.
Photonic Doppler velocimetry (PDV) has rapidly become a standard diagnostic for measuring velocities in dynamic compression research. While free surface velocity measurements are fairly straightforward, complications occur when PDV is used to measure a dynamically loaded sample through a window. Fresnel reflections can severely affect the velocity and time resolution of PDV measurements, especi...
متن کاملSHOCK TEMPERATURES OF SiO 2 AND THEIR GEOPHYSICAL IMPLICATIONS
The temperature of SiO 2 in their bearing on problems of the physical and high-pressure shock states has been measured for compositional states of the earth's interior. samples of single-crystal e-quartz and fused Models of the high-pressure equation of state and quartz. Pressures between 60 and 140 GPa have phase diagram of SiO? may provide direct been studied using projectile impact and optic...
متن کاملPhase-matched second-harmonic generation by eriodic poling of fused silica
90” phase matching in periodically poled fused silica is achieved over approximately 2 mm at a wavelength of 1064 nm. Electrical poling was done at 5 kV for 120 min using photolithographed periodic electrodes on fused silica glass at 250 “C. A nonlinearity equivalent to &/200 of quartz is estimated from measurements. Several phase-matched interactions are reported and the implications for devic...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2014