ʻO ka pauma Magnesium Boride, MgB2

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ʻO ka pauma Magnesium Boride, MgB2

ʻO ka magnesium diboride superconductor i ka uila, ʻume mākenēki, wela a pēlā aku. He nui nā noi. Nā mākēneki e alakaʻi ana i nā laina, nā laina hoʻoili uila a me nā mea ʻike kahua magnet


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Kaulana Molecular  MGB2
Helu CAS  12007-62-4
Nā ʻano  pauka hao ʻeleʻele hinahina
Ka mānoanoa  2.57 Bi / cm3
Kuhi hoʻoheheʻe  830 C
Hoʻohana  ʻO ka magnesium diboride superconductor i ka uila, ʻume mākenēki, wela a me nā noi nui. Nā mākēneki Superconducting, nā transmlines uila a me nā mea ʻike kahua manamana koʻikoʻi

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ʻO ka magoride diboride
ʻIʻike ʻia hoʻi ma ke ʻano he magnesium borate
ʻO ka haʻina kemika MgB2
Kaupaona Molecular 45.93
Helu CAS 12007-25-9
Kuhi hoʻoheʻe 830 ℃
ʻO 2.57g / cm3 ka nui

ʻO ka magnesium diboride kahi hui ionic me ke aniani hexagonal. He mea palupalu a paʻakikī ia me ka ductility maikaʻi ʻole. He hui intercalation ia. Hoʻonohonoho koho ʻia nā magnesium a me nā boron. E hoʻololi ia i superconductor ma kahi mahana e kokoke iki ana i ka mahana wela o 40K (ie - 233 ℃). ʻO kāna mahana hoʻololi e ʻane ʻelua manawa ke kiʻekiʻe ma mua o nā superconductors ʻē aʻe o ke ʻano like, a me kāna mahana hana maoli 20 ~ 30K. ʻO ka pāhana hoʻololi superconducting o MgB2 he 39K, ʻo ia ka minus 234 ℃, ʻo ia ka mahana wela kiʻekiʻe loa o nā superconductors hui metallic. Ma ke ʻano he mea hou me ka superconductivity, wehe ka magnesium diboride i kahi ala hou e hoʻopaʻa ai i ka hanauna hou o ka semiconductor kiʻekiʻe me ka maʻalahi. ʻO ka superconductor magnesium diboride kahi hui metala i hana ʻia e ka hui ʻana o ka magnesium a me ka boron i ka lakio o 1: 2. Hoʻohālikelike ʻia ia e nā kumuwaiwai nui, ke kumu kūʻai haʻahaʻa, conductivity kiʻekiʻe, maʻalahi maʻalahi a me ka hana maʻalahi.

Ma muli o ka maʻalahi o MgB2 e hana ʻia i mau kiʻi ʻoniʻoni lahilahi a me nā uea, hiki ke hoʻohana ākea ʻia i ka hana ʻana i nā CT scanner a me nā mea uila ʻē aʻe, nā ʻāpana o nā supercomputers a me nā ʻāpana o ka pono hoʻoili uila. Loaʻa iā ia kahi noi noi ākea i ke kahua o ka uila a me ka kamepiula. ʻO kahi ʻano o ka mgb2 kiʻekiʻe kiʻekiʻe MgB2 hāpana i synthesize ʻia e ke ana wela a me ke kiʻekiʻena kiʻekiʻe ma Kina, kahi kokoke i ka pae honua. Loaʻa nā noi kūpono o MgB2 me nā mākēneki superconducting, nā laina hoʻoili uila a me nā mea ʻike kahua magnet. I ka 2001, ua ʻike nā kānaka noiʻi he hui nondescript, magnesium diboride, e loli i superconductor ma kahi mahana kokoke i ka mahana wela loa o 40K (- 233 ℃). ʻO kāna mahana hoʻololi e ʻane ʻelua manawa ke kiʻekiʻe ma mua o nā superconductors ʻē aʻe o ke ʻano like, a me kāna mahana hana maoli 20 ~ 30K. I mea e loaʻa ai kēia mahana, neon wai, wai hydrogen a i ʻole pahu pihi paʻa hiki ke hoʻohana ʻia e hōʻoluʻolu i ka mahana.

Hoʻohālikelike ʻia me ka ʻenehana hōʻoluʻolu o ka niobium alloy (4K) me ka wai helium, maʻalahi a maʻalahi ke kumu kūʻai. I ka manawa e hoʻopili ʻia me ke kalapona a i ʻole nā ​​impurities ʻē aʻe, hiki ʻole i ka magnesium borate ke mālama i ka superconductivity ma mua o ka niobium alloy a ʻoi aku paha ka maikaʻi ma ka hihia o ka māneka a i ʻole ia. ʻO kāna mau noi hiki ke komo pū me nā mākēneki superconducting, nā laina hoʻoili uila a me nā mea ʻike kahua magnet.

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