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The Cr2+-based compounds, A2CrX4, where A = M+ (e.g., K+, Cs+, Rb+) or RNH3+ (e.g., MeNH3+) and X = Cl-, Br-, are an underexplored family of lead-free layered metal-halide perovskites. These compounds attracted a great deal of interest in the 1970s and 1980s after their "transparent ferromagnetism" was discovered, but they have received virtually no attention since, perhaps because they are extremely unstable in air. Further investigation into their chemistry and properties is warranted.

This article studies the reversible structure and mechanical properties of a biological dynamic polymer network. This biological material based on structural protein polymers has a glass transition at 35 °C, causing a reversible thermomechanical transition and a change in modulus spanning several orders of magnitudes.

The atomic structure along step edges on metal oxide surfaces is crucial for the growth of overlayers in complex oxide devices. No experimental techniques are yet capable of resolving that structure. Theoretical calculations of step structures on metal oxides are complex and have not been reported to date.

Researchers in the Center for the Science and Engineering of Materials (CSEM) at the California Institute of Technology are developing a new class of biomaterials for use in surgery and regenerative medicine. These new materials are produced by genetic engineering, and consist of pieces of natural proteins that have been stitched together in new ways to allow control of both their mechanical properties and their interactions with cells and tissues after surgical implantation.

R.M. Suter /CMU MRSEC, Carnegie Mellon University, NSF DMR- 0520425

Paul A. Heiney and Virgil Percec

In March, a group of physicists from the Chicago MRSEC visited Washington DC to talk about science to Congressional Representatives, their staff, and others. The message: basic research is vital to America's economy and our childrens' futures. In the photo, current MRSEC Director, Sidney Nagel (left) demonstrates the properties of materials to CUNY Prof. Myriam Sarachik (former President of the APS) and U.S. Rep. Vernon J.

Several MRL Faculty members were honored this summer and early fall for achievements in and significant contributions to their respective fields. The Millennium Prize Foundation of Finland announced that Professor Shuji Nakamura, who is involved with MRL's IRG-2 project on Oxide Based Semiconductors, is the sole winner of the 2006 Millennium Technology Prize, accompanied by one million euros (about $1.3 million in U.S. dollars).