最新色国产精品精品视频,中文字幕日韩一区二区不卡,亚洲有码转帖,夜夜躁日日躁狠狠久久av,中国凸偷窥xxxx自由视频

+高級檢索
純MgB2和碳摻雜MgB2超導(dǎo)塊材在酸浸過程中相成分和微觀結(jié)構(gòu)的演變
DOI:
作者:
作者單位:

作者簡介:

通訊作者:

中圖分類號:

基金項目:


Investigation on Phase and Microstructure Comparison of Pure and Carbon-Doped MgB2 Superconducting Bulks during Acid Exposure
Author:
Affiliation:

Fund Project:

Nature Science Foundation of China (50672077) and National Basic Research Program of China (2006CB601004)

  • 摘要
    • |
  • 圖/表
    • |
  • 訪問統(tǒng)計
    • |
  • 參考文獻(xiàn)
    • |
  • 相似文獻(xiàn)
    • |
  • 引證文獻(xiàn)
    • |
  • 資源附件
    • |
  • 文章評論
    摘要:

    采用X射線衍射儀和掃描電鏡系統(tǒng)研究了純MgB2和 碳摻雜MgB2超導(dǎo)塊材在的鹽酸溶液中(pH=2)酸浸后的相成分和微觀結(jié)構(gòu)演變過程。XRD結(jié)果顯示，純MgB2和 碳摻雜MgB2超導(dǎo)塊材均迅速與鹽酸反應(yīng)而分解。分解反應(yīng)在5 h后完全結(jié)束，主要的固態(tài)產(chǎn)物是B(OH)3和MgCl2(6H2O)。SEM結(jié)果顯示，純MgB2和碳摻雜MgB2超導(dǎo)塊材與酸反應(yīng)都是從晶界處開始，與純MgB2塊材相比，碳摻雜MgB2塊材在與酸反應(yīng)后仍保持致密的結(jié)構(gòu)特征。而對酸浸10 min后純MgB2和碳摻雜MgB2塊材的臨界超導(dǎo)轉(zhuǎn)變溫度測定結(jié)果顯示，碳摻雜MgB2塊材的臨界超導(dǎo)轉(zhuǎn)變溫度保持不變，說明碳摻雜可提高M(jìn)gB2在酸中的穩(wěn)定性

    Abstract:

    The phase composition and microstructure evolution of pure and carbon-doped MgB2 bulks exposed to hydrochloric acid (pH=2) for different time were investigated by X-ray diffraction (XRD) and Scanning electron microscopy (SEM) systematically. XRD results show the decomposition of pure and carbon-doped MgB2 bulks exposed to acid is rapid decay with exposure time. The decomposition reaction will finish completely after 5 h exposure and the main solid products are B(OH)3 and MgCl2(6H2O). The SEM results demonstrate that the reaction among pure and carbon-doped MgB2 as well as HCl occurs at grain boundaries. But the grain connection of carbon-doped MgB2 is better than that of pure MgB2 after acid exposure. The Tc of MgB2 decreases after 10 min acid exposure, but Tc is almost unchanged in carbon-doped MgB2 after the same exposure. This result indicates that substitution of C for boron in MgB2 can improve of the resistance to the corrosion of acid

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

熊曉梅,閆 果,劉國慶,王慶陽,馮 勇.純MgB2和碳摻雜MgB2超導(dǎo)塊材在酸浸過程中相成分和微觀結(jié)構(gòu)的演變[J].稀有金屬材料與工程,2009,38(9):1526~1529.[Xiong Xiaomei, Yan Guo, Liu Guoqing, Wang Qingyang, Feng Yong. Investigation on Phase and Microstructure Comparison of Pure and Carbon-Doped MgB2 Superconducting Bulks during Acid Exposure[J]. Rare Metal Materials and Engineering,2009,38(9):1526~1529.]
DOI：[doi]

復(fù)制
文章指標(biāo)
  • 點擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2008-12-31
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期:
  • 出版日期: