scholarly journals Nondestructive Characterization of Silicon Carbide by Impedance Spectroscopy Method.

1995 ◽  
Vol 61 (585) ◽  
pp. 940-945 ◽  
Author(s):  
Mikiko Nakajima ◽  
Tetsuo Shoji ◽  
Hisashi Hasuda
Keyword(s):  
Silicon Carbide ◽  
Impedance Spectroscopy ◽  
Spectroscopy Method ◽  
Nondestructive Characterization

Microwave Dielectric Loss Characterization of Silicon Carbide Wafers

2006 ◽  
Vol 527-529 ◽  
pp. 733-736
Author(s):  
Timothy Bogart ◽  
W.J. Everson ◽  
Rick D. Gamble ◽  
Ed Oslosky ◽  
David Snyder ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Dielectric Loss ◽  
Microwave Cavity ◽  
High Yield ◽  
Microwave Dielectric ◽  
Mapping System ◽  
High Frequency Devices ◽  
Nondestructive Characterization ◽  
Initial Results

Semi-insulating silicon carbide (SiC) wafers are important as substrates for high frequency devices such as AlGaN-GaN HEMT’s. A nondestructive characterization technique has been developed to measure the dielectric properties of SiC wafers in the GHz frequency range where the devices will operate in order to validate wafers for high yield working devices. The dielectric loss is measured at approximately 16 GHz in a split microwave cavity. Initial results show a correlation where the dielectric loss decreases as the resistivity increases, where the resistivity was measured using a Contactless Resistivity Mapping system (COREMA). The uniformity of dielectric loss across SiC wafers was evaluated using a split post dielectric resonator cavity fixed at 5.5GHz to measure the dielectric loss at five points on a wafer. Dielectric loss as a function of temperature from room temperature to 400°C was also studied.

Nanojacketing and Dejacketing of ds-DNA: A Nondestructive Characterization of a Nanojacketed Sample by Impedance Spectroscopy

2014 ◽  
Vol 118 (10) ◽  
pp. 2649-2661 ◽  
Author(s):  
Sudipta Nandi ◽  
Pratap Mukherjee ◽  
Aniruddha Kundu ◽  
Arun K. Nandi
Keyword(s):  
Impedance Spectroscopy ◽  
Nondestructive Characterization

Irradiation behavior of pyrolytic silicon carbide

1983 ◽  
Vol 41 ◽  
pp. 72-73
Author(s):  
R. J. Lauf
Keyword(s):  
Silicon Carbide ◽  
Fission Products ◽  
Thermodynamics And Kinetics ◽  
Neutron Fluences ◽  
Fuel Particles ◽  
Sic Coatings ◽  
Irradiation Behavior ◽  
Kinetics Of ◽  
Htgr Fuel

Fuel particles for the High-Temperature Gas-Cooled Reactor (HTGR) contain a layer of pyrolytic silicon carbide to act as a miniature pressure vessel and primary fission product barrier. Optimization of the SiC with respect to fuel performance involves four areas of study: (a) characterization of as-deposited SiC coatings; (b) thermodynamics and kinetics of chemical reactions between SiC and fission products; (c) irradiation behavior of SiC in the absence of fission products; and (d) combined effects of irradiation and fission products. This paper reports the behavior of SiC deposited on inert microspheres and irradiated to fast neutron fluences typical of HTGR fuel at end-of-life.

A Possible Basis for Nondestructive Characterization of Ropes of Nylon 6

1997 ◽  
Vol 503 ◽  
Author(s):  
H. Jiang ◽  
M. K. Davis ◽  
R. K. Eby ◽  
P. Arsenovic
Keyword(s):  
Tensile Strength ◽  
Service Life ◽  
Fiber Diameter ◽  
Structural Parameters ◽  
Crystal Form ◽  
Nylon 6 ◽  
Remaining Service Life ◽  
Nondestructive Characterization ◽  
Fractional Content

ABSTRACTPhysical properties and structural parameters have been measured for ropes of nylon 6 as a function of the number of use operations. The fractional content of the α crystal form, sound velocity, birefringence, tensile strength and length all increase systematically and significantly with increasing the number of use operations. The fractional content of the γ crystal form and fiber diameter decrease with use. These trends indicate that the measurement of such properties and structural parameters, especially the length, provide a possible basis for establishing a reliable, rapid, and convenient nondestructive characterization method to predict the remaining service life of nylon 6 ropes.

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