Effect of nanometer-sized B powder on phase formation of polycrystalline MgB2

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dc.creatorAn, Ling
dc.creatorChen, Chinping
dc.creatorWang, Bo
dc.creatorZhuang, Cheng-gang
dc.creatorLi, Xing-guo
dc.creatorZhou, Zeng-jun
dc.creatorFeng, Qing-rong
dc.date2004-10-21
dc.date.accessioned2026-07-07T03:01:36Z
dc.date.available2026-07-07T03:01:36Z
dc.descriptionThe size effect of the raw B powder on the MgB2 phase formation has been studied by the technique of in-situ high temperature resistivity (HT-rT) measurement. The onset temperature, Tonset, and the completion temperature, TPF, of the phase formation are determined directly during the ongoing thermal process. These two temperatures, Tonset and TPF of the sample synthesized using nanometer B and Mg powders (NanoB-MgB2) are 440 C and 490 C, respectively, the same as those of the sample using micrometer B and nanometer Mg powders (MicroB-MgB2). This indicates that the phase formation temperature of MgB2 do not depend on the B powder size. On the other hand, the upper limit of the sintering temperature, TN, above which the sample loses superconductivity, is below 750 C for NanoB-MgB2, much lower than 980 C for the MgB2 prepared using micron-sized B powder and millimeter sized Mg powder (DM-MgB2). In comparison with the sample directly sintered at 650 C < TN, an interesting, irreversible transformation in the crystal structure of the MgB2 phase was observed with the sample going through the stages of initial sintering at 750 C, then re-sintering at 650 C in an Mg-rich environment after the processes of regrinding and pressing. Possible explanation of the observed properties is discussed.
dc.description7 pages with 4 figures included
dc.identifierhttps://arxiv.org/abs/cond-mat/0410533
dc.identifierhttp://arxiv.org/abs/cond-mat/0410533
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/25109
dc.subjectSuperconductivity
dc.subjectMaterials Science
dc.titleEffect of nanometer-sized B powder on phase formation of polycrystalline MgB2
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