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 by Staff Writers Bethlehem PA (SPX) Jan 30, 2019
A team of researchers from Lehigh University, Oak Ridge National Laboratory, Lebanon Valley College and Corning Inc. has demonstrated, for the first time, that crystals manufactured by lasers within a glass matrix maintain full ferroelectric functionality. "This includes the ability to uniformly orient and reverse orient the ferroelectric domains with an electric field?despite the fact that the crystal is strongly confined by the surrounding glass," says Volkmar Dierolf, Chair of Lehigh University's Department of Physics and one of the scientists who worked on the experiments that resulted in these findings. Dierolf, who holds a joint appointment with Lehigh's Department of Materials Science and Engineering part of the P.C. Rossin College of Engineering and Applied Science, is co-Principal Investigator on a National Science Foundation (NSF)-funded project, Crystal in Glass, along with Principal Investigator Himanshu Jain, Diamond Distinguished Chair of Lehigh's Department of Materials Science and Engineering. The group has become a world leader in producing single crystals in glass by localized laser irradiation. Read more about their work: "Crossing a critical threshold" and "Lehigh scientists fabricate a new class of crystalline solid." The team conducted the first detailed examination of the piezoelectric and ferroelectric properties of laser induced crystals confined in glass. They found that the as-grown crystals possess a complex ferroelectric domain structure that can be manipulated via the application of a DC bias. The findings have been published online in MRS Communications in a paper called "Ferroelectric domain engineering of lithium niobate single crystal confined in glass." "The findings open up the possibility of a new collection of optical devices that use fully functional laser-fabricated crystals in glass which rely on the precise control of the ferroelectric domain structure of the crystal," said Keith Veenhuizen, currently Assistant Professor, Department of Physics at Lebanon Valley College and the lead author of the paper, which builds on the work he did as a graduate student at Lehigh. Applications for such technology include use in modern fiber optic technology used for data transmission. "Being able to embed such functional single crystal architectures within a glass enables high efficiency coupling to existing glass fiber networks," says Dierolf. "Such low loss links that maximize performance are of particular importance for future quantum information transfer system that are projected to take over the current schemes for optical communication," adds Dierolf.
UH researchers report new class of polyethylene catalyst Houston TX (SPX) Jan 28, 2019 A team of chemists from the University of Houston has reported the discovery of a new class of catalyst to produce ultra-high-weight polyethylene, a potential new source of high-strength, abrasion-resistant plastic used for products ranging from bulletproof vests to artificial joints. The nickel-based catalyst is described in a paper published Friday, Jan. 25, in Nature Communications. "This is a completely new class of catalysts that can produce ultra-high-weight polyethylene," said co-auth ... read more
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