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In a study of the influence of ZrB2 additions on the irreversibility field,Birr and the upper critical field Bc2, bulk samples with 7.5 at. % ZrB2additions were made by a powder milling and compaction technique. These sampleswere then heated to 700-900C for 0.5 hours. Resistive transitions were measuredat 4.2 K and Birr and Bc2 values were determined. An increase in Bc2 from 20.5T to 28.6 T and enhancement of Birr from 16 T to 24 T were observed in the ZrB2doped sample as compared to the binary sample at 4.2 K. Critical fieldincreases similar to those found with SiC doping were seen at 4.2 K. At highertemperatures, increases in Birr were also determined by M-H loop extrapolationand closure. Values of Birr which were enhanced with ZrB2 doping (as comparedto the binary) were seen at temperatures up to 34 K, with Birr values largerthan those for SiC doped samples at higher temperatures. The transitiontemperature, Tc, was then measured using DC susceptibility and a 2.5 K drop ofthe midpoint of Tc was observed. The critical current density was determinedusing magnetic measurements and was found to increase at all temperaturesbetween 4.2 K and 35 K with ZrB2 doping.Comment: 15 pages, 5 figs, 1 tabl

Increases in the irreversibility field and the upper critical field of bulk MgB2 by ZrB2 addition