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
Solid State Reaction of Ir with SiC and Ir with Y2O3
DOI:
作者:
作者單位:

作者簡介:

通訊作者:

中圖分類號:

基金項(xiàng)目:


Solid State Reaction of Ir with SiC and Ir with Y2O3
Author:
Affiliation:

Fund Project:

National Natural Science Foundations of China (51102197)

  • 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:

    研究了難熔金屬銥與SiC及銥與Y2O3的固相反應(yīng)，采用金屬間化合物的標(biāo)準(zhǔn)生成吉布斯自由能等于標(biāo)準(zhǔn)形成焓的方法計算固相反應(yīng)熱力學(xué)，采用電子分布與晶體結(jié)構(gòu)之間相關(guān)的Engel理論分析了銥與Y2O3的固相反應(yīng)機(jī)制。結(jié)果表明，銥與SiC在1000 ℃開始反應(yīng)生成Ir3Si和石墨，隨著反應(yīng)溫度升高，Ir3Si與SiC進(jìn)一步反應(yīng)生成更高熔點(diǎn)的IrSi，當(dāng)反應(yīng)溫度為1400 ℃時，固相反應(yīng)產(chǎn)物為IrSi和石墨。在1800 ℃的還原性碳?xì)夥障?，銥與Y2O3能夠發(fā)生固相反應(yīng)生成Ir2Y和CO，Ir外圍電子層失去電子形成d5sp2排布，Y外圍電子層得到電子形成d3sp排布，成鍵電子數(shù)目由17個增加至21個，導(dǎo)致Ir-Y 鍵能大于Y-O鍵能。

    Abstract:

    Solid state reactions between Ir and SiC and between Ir and Y2O3 were studied. The thermodynamics and mechanism of solid state reaction were discussed. The results indicate that Ir reacts with SiC at 1000 °C to yield Ir3Si and graphitized carbon. The products of Ir silicide changes from Ir3Si and IrSi at 1200 °C to IrSi at 1400 °C. The solid state reaction between Ir and Y2O3 is thermodynamically favorable above 1800 °C in a reductive carbon atmosphere. The reaction mechanism between Ir and Y2O3 was analyzed based on the Engel correlation between electronic configuration and structures of metals and alloy crystal structure.

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

華云峰,李爭顯,杜繼紅,黃春良. Solid State Reaction of Ir with SiC and Ir with Y2O3[J].稀有金屬材料與工程,2012,41(7):1149~1152.[Hua Yunfeng, Li Zhengxian, Du Jihong, Huang Chunliang. Solid State Reaction of Ir with SiC and Ir with Y2O3[J]. Rare Metal Materials and Engineering,2012,41(7):1149~1152.]
DOI：[doi]

復(fù)制
文章指標(biāo)
  • 點(diǎn)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:2011-07-28
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期:
  • 出版日期: