University of California

Frederick M Mueller

Yuntian Theodore Zhu

Dean E Peterson

Adriana C Serquis

Xiao Zhou Liao

A process of preparing superconducting magnesium diboride powder by heating an admixture of solid magnesium and amorphous boron powder or pellet under an inert atmosphere in a Mg:B ratio of greater than about 0.6:1 at temperatures and for time sufficient to form said superconducting magnesium diboride. The process can further include exposure to residual oxygen at high synthesis temperatures followed by slow cooling. In the cooling process oxygen atoms dissolved into MgB segregated to form nanometer-sized coherent Mg(B,O) precipitates in the MgB matrix, which can act as flux pinning centers.

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Los Alamos, NM, United States of America

Frederick M Mueller