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Fabrication and properties of SiNO continuous fiber reinforced BN wave-transparent composites

Cao F., Fang Z., Chen F., Shen Q., Zhang C.

Materials Science Poland

2012

Vol. 30, No. 2

137--142

SiNO continuous fiber reinforced boron nitride (BN) wave-transparent composites (SiNOf /BN) have been fabricated by a precursor infiltration pyrolysis (PIP) method using borazine as the precursor. The densification behavior, microstructures, mechanical properties, and dielectric properties of the composites have been investigated. After four PIP cycles, the density of the composites had increased from 1.1 g-cm-3 to 1.81 g-cm-3. A flexural strength of 128.9 MPa and an elastic modulus of 23.5 GPa were achieved. The obtained composites have relatively high density and the fracture faces show distinct fiber pull-out and interface de-bonding features. The dielectric properties of the SiNOf /BN composites, including the dielectric constant of 3.61 and the dielectric loss angle tangent of 5.7-0-3, are excellent for application as wave-transparent materials.

Doped cap layer effect on impurity-free vacancy enhanced disordering in InGaAs/InP quantum well structures

An Y. P., Wang Y. D., Cao F.

Optica Applicata

2010

Vol. 40, nr 1

249--254

Strong influence on impurity-free vacancy enhanced disordering by the cap layer doping is studied on the InGaAs/InP quantum well structure with a doped cap layer. The observations are consistent with intermixing experiments using both Si3N4 and SiO2 as encapsulation dielectric layers. The largest intermixing occurs in the n-InP capped samples and is explained by the enhancement in out-diffusion of positive ions by the built-in electric field.