Processing and characterization of zinc sulfide based materials

<p>Monodisperse, submicron, spherical, and porous clusters of zinc sulfide (ZnS) nanocrystallites were used as a host material, into which gallium phosphide (GaP) was impregnated. A solution containing a phosphinogallane, (t-Bu)[subscript]2GaP(t-Bu)[subscript]2, and a vapor mixture of GaI and P[subscript]4 were used as precursors for GaP;Powders obtained via organometallic precursors were nanocomposite powders with an average crystallite size of 12 nm and maintained the initial powder morphology of ZnS after heat treatment at 800°C for 24 hours. After hot isostatic pressing, relative densities greater than 95% and ultra-fine microstructures with average grain sizes ranging 16-31 nm were achieved. Nanocomposites showed significant increase in hardness, as high as ~100%, compared to pure ZnS. Powders obtained using vapor phase precursors were mainly solid solutions between ZnS and GaP. The powders were densified to over 98% relative densities by hot isostatic pressing. Both hardness and fracture toughness increased with increasing GaP content.</p>

Name thesis:degree_name

Doctor of Philosophy

Level thesis:degree_level

dissertation

Department dc:contributor.department

Department of Materials Science and Engineering

Year dc:date.issued

1994

Author dc:creator

• Han, Yong

Advisor dc:contributor.advisor

• Mufit Akinc

Language dc:language.iso

en

DOI

https://doi.org/10.31274/rtd-180813-11762

Identifier

archive/lib.dr.iastate.edu/rtd/10476/

OAI identifier oai:identifier

oai:dr.lib.iastate.edu:20.500.12876/63626