Magnesium Boride Hmoov, MgB2

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Magnesium Boride Hmoov, MgB2

Magnesium diboride superconductor hauv hluav taws xob, sib nqus, kub thiab lwm yam on.it muaj cov ntawv thov tseem ceeb. Super ua cov hlau nplaum, sib kis kab hluav taws xob thiab kab ntsuas qhov sib nqus


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Cov mis mos molecular  MGB2
Tus Lej  12007-62-4
Nta  txho dub hlau hmoov
Yog ceev  2.57 g / cm3
Melting taw tes  830 C
Kev Siv  Magnesium diboride superconductor hauv qhov hluav taws xob, sib nqus, kub thiab lwm yam muaj cov ntawv thov tseem ceeb. Superconducting cov hlau nplaum, cov kab xa hluav taws xob thiab cov khoom sib nqus yooj yim

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Magnesium diboride
Kuj tseem hu ua magnesium borate
Noj tshuaj mis MgB2
Molecular phaus 45.93
CAS tus xov tooj 12007-25-9
Melting point 830 ℃
Qhov ntom yog 2.57g / cm3

Magnesium diboride yog ib qho tshuaj ionic sib xyaw nrog hexagonal crystal qauv. Nws yog cov khoom siv tawv thiab tawv tawv nrog cov dej tsis zoo. Nws yog ib qho sib txuas sib xyaw. Cov khaubncaws sab nraud povtseg magnesium thiab boron yog teem ua lwm tshooj. Nws yuav hloov mus rau hauv superconductor ntawm qhov kub me ntsis ze rau qhov tsis txaus siab txog 40K (piv txwv li - 233 ℃). Nws qhov kev hloov pauv kub yog yuav luag ob zaug siab dua li ntawm lwm cov superconductors ntawm tib lub hom, thiab nws qhov kev ua haujlwm tiag tiag yog 20 ~ 30K. Qhov ntsuas kub hloov superconducting ntawm MgB2 yog 39K, uas yog rho tawm 234 ℃, uas yog qhov kub siab tshaj qhov tseem ceeb ntawm kev siv hlau ua kom sib xyaw superconductors. Ua cov khoom siv tshiab nrog superconductivity, magnesium diboride qhib txoj hauv kev tshiab los kawm qhov tshiab ntawm qhov kub siab semiconductor nrog cov qauv yooj yim. Tus superconductor magnesium diboride yog hlau txuas tsim los ntawm kev sib xyaw ntawm cov hlau nplaum thiab boron hauv qhov sib piv ntawm 1: 2. Nws yog tsiag ntawv los ntawm cov khoom muaj nqis, tus nqi qis, kev ua haujlwm siab, yooj yim synthesis thiab kev ua haujlwm yooj yim.

Vim tias MgB2 yooj yim los ua cov yeeb yaj kiab thiab cov xov hlau, nws tuaj yeem siv dav hauv kev tsim khoom ntawm CT scanners thiab lwm yam khoom siv hluav taws xob, cov khoom lag luam ntawm cov kws tshaj lij thiab cov khoom siv ntawm cov khoom siv fais fab. Nws muaj cov ntawv thov dav dav hauv kev lag luam ntawm cov khoom siv hluav taws xob thiab khoos phis tawm. Ib hom ntawm qhov siab ceev MgB2 superconductor qauv tau ntse ua tiav los ntawm kev ntsuas kub thiab ntsuas kub nyob hauv Suav teb, uas ze rau theem thoob ntiaj teb. Muaj peev xwm siv tau ntawm MgB2 suav nrog kev ua haujlwm loj cov hlau nplaum, cov xaim hluav taws xob kis thiab cov khoom sib nqus sib nqus. Xyoo 2001, cov kws tshawb nrhiav tau pom tias tsis muaj qhov tsis sib xws, magnesium diboride, hloov mus rau hauv lub superconductor ntawm qhov kub me ntsis ze rau qhov tseeb kub ntawm 40K (- 233 ℃). Nws qhov kev hloov pauv kub yog yuav luag ob zaug siab dua li ntawm lwm cov superconductors ntawm tib lub hom, thiab nws qhov kev ua haujlwm tiag tiag yog 20 ~ 30K. Yuav kom ua tiav qhov ntsuas kub no, kua neon, kua hydrogen los yog kaw lub voj voog txias yuav siv tau los ua qhov kub thiab txias.

Piv nrog rau qhov kev lag luam txias ntawm niobium alloy (4K) nrog kua helium, cov qauv no yooj yim thiab raug nqi. Ib zaug doped nrog cov pa roj carbon lossis lwm qhov tsis txaus, lub peev xwm ntawm magnesium borate kom tswj tau superconductivity tsis muaj tsawg dua li ntawm niobium alloy lossis txawm tias zoo dua nyob rau hauv cov ntaub ntawv ntawm cov hlau nplaum lossis cov khoom siv tam sim no. Nws cov ntawv thov muaj peev xwm suav nrog superconducting cov hlau nplaum, kab hluav taws xob kis thiab rhiab ntsuas lub tshuab nqus hlau.

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