Steven H Lawrence

Title: Innovations of Steven H. Lawrence in Superconducting Materials

Introduction

Steven H. Lawrence is a notable inventor based in Fort Washington, MD (US). He has made significant contributions to the field of superconducting materials, holding two patents that showcase his innovative approaches to producing high-performance superconductors.

Latest Patents

One of his latest patents is titled "Process for making superconducting PBSCCO and PBSCCO parts." This patent describes a process for producing the 2223 phase of (Pb,Bi)SrCaCuO that is much faster than existing methods. The process involves calcining a precursor powder mixture while maintaining intimate mixing through intermediate grindings during calcination. It also includes compressing the calcination product into a consolidated body and heating it while maintaining intimate mixing to form essentially phase pure 2223 (Pb,Bi)SrCaCuO. Additionally, he has developed a fast process for making a (Pb,Bi)SrCaCuO part with a high critical current density (J.sub.c). This involves pressing calcined and reacted (Pb,Bi)SrCaCuO powder into a green body and sintering it for a selected time, ideally between 6 and 8 hours, to establish superconducting electrical contact between grains while preventing void formation or part shape distortion. The resulting part has a high density, at least about 4 or 5 g/cm.sup.3.

Another significant patent is the "Method of making substantially single phase superconducting oxide." This patent outlines a method for forming a substantially single phase superconducting composition from a 1:2:3 molar ratio of fine powders of a superconducting rare earth oxide, CuO, and BaCo.sub.3. The mixed powders and shaped articles are calcined, sintered, and cooled in an oxygen-containing atmosphere. The slow cooling step is crucial for converting the sample to the orthorhombic structure and enhancing its superconducting properties.

Career Highlights

Steven H. Lawrence works for the United States as represented by the Secretary of the Navy. His work focuses on advancing the field of superconductivity, which has significant implications for various technological applications.

Collaborations

He has collaborated with notable coworkers, including Louis E. Toth and Syed B. Quadri, contributing to the development of innovative superconducting materials.

Conclusion

Steven H. Lawrence