Lanthanum hexaboride LaB6 pauka

ʻIke pōkole:

Lanthanum hexaboratehe mea hoʻohuihui non-metallic ʻole i haku ʻia me ka boron valence haʻahaʻa a me ka lanthanum mea metala laha loa, nona kahi ʻano aniani kūikawā a me nā ʻano kumu o nā boride. Mai ka hiʻohiʻona o nā waiwai waiwai, ʻo ka lanthanum hexaborate LaB6 no kahi hui refractory metala me kahi ʻano aniani cubic. Loaʻa iā ia nā waiwai maikaʻi e like me ka paʻakikī kiʻekiʻe, ka conductivity kiʻekiʻe, ka helu heheʻe kiʻekiʻe, ka coefficient haʻahaʻa o ka hoʻonui ʻana i ka wela, a me ke kūpaʻa kemika maikaʻi. I ka manawa like, hoʻopuka ka lanthanum hexaborate i ke kiʻekiʻe o kēia manawa a me ka haʻahaʻa haʻahaʻa haʻahaʻa i nā wela kiʻekiʻe, a he ikaika ke kū'ē i ka pōʻino ion, ke kahua uila ikaika, a me ka radiation. Ua hoʻohana 'ia i loko o nā mea cathode, electron microscopy, electron beam welding Nā noi ma nā kula e koi ana i nā au e hoʻokuʻu kiʻekiʻe, e like me nā paipu hoʻokuʻu.

 Lanthanum hexaborateloaʻa nā waiwai kemika paʻa a ʻaʻole e hoʻopili me ka wai, ka oxygen, a i ʻole ka waika hydrochloric; Ma ka lumi wela, hoʻopili wale ia me ka waikawa nitric a me ka aqua regia; Hiki wale ka oxidation ma 600-700 ℃ i loko o ka lewa aerobic. I loko o ka lewa hau, hiki i ka LaB6 mea ke hana me nā mea ʻē aʻe a i ʻole nā ​​kinoea e hana i nā mea hoʻoheheʻe haʻahaʻa; I nā wela kiʻekiʻe, e hoʻomau mau ana nā mea i hana ʻia, e hōʻike ana i ka haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa haʻahaʻa o ka lanthanum hexaborate crystal i ka ʻili hoʻokuʻu, a laila e hāʻawi ai i ka lanthanum hexaborate maikaʻi loa i ka hiki ʻana i ka lāʻau make.

ʻO kalanthanum hexaborateʻO ka cathode he haʻahaʻa haʻahaʻa haʻahaʻa a me ka lōʻihi o ke ola lawelawe ma nā wela kiʻekiʻe. Ke hoʻomehana ʻia i kahi wela kiʻekiʻe, hoʻohua nā ʻātoma lanthanum metala o ka ʻili i nā hakahaka ma muli o ka nalowale ʻana o ka ea, ʻoiai ʻo nā ʻātoma lanthanum metala o loko e hoʻopuʻi e hoʻohui i nā hakahaka, e hoʻomau i ka hoʻololi ʻole ʻana o ka ʻōnaehana boron. Hoʻemi kēia waiwai i ka nalowale o ka evaporation o LaB6 cathode a mālama i kahi ʻili cathode ikaika i ka manawa like. Ma ka like o ka hoʻokuʻu ʻana o kēia manawa, ʻoi aku ka haʻahaʻa o ka evaporation o nā mea cathode LaB6 i nā wela kiʻekiʻe ma mua o nā mea cathode maʻamau, a ʻo ka haʻahaʻa haʻahaʻa haʻahaʻa he mea nui i ka hoʻonui ʻana i ke ola lawelawe o nā cathodes.

Noi:

1. ʻO Lanthanum hexaborate LaB6 mea cathode

ʻO ke kiʻekiʻe o ka hoʻokuʻu ʻana i kēia manawa a me ka haʻahaʻa haʻahaʻa haʻahaʻa i nā wela kiʻekiʻe oLaB6 lanthanum hexaboratee hana i mea cathode me ka hana ʻoi aku ka maikaʻi, e hoʻololi mālie i kekahi mau cathodes tungsten i nā noi ʻoihana. I kēia manawa, ʻo nā wahi noi nui o nā mea cathode LaB6 me ka lanthanum hexaborate penei:

1.1 ʻOihana ʻenehana hou e like me ka microwave vacuum uila uila a me ka ion thrusters ma ka pūʻali koa a me ka ʻenehana ākea, nā mea hōʻike a me nā kiʻi kiʻi me ka wehewehe kiʻekiʻe a me ka emissivity kiʻekiʻe o kēia manawa e koi ʻia e nā ʻoihana kīwila a me nā koa, a me nā laser beam electron. I kēia mau ʻoihana ʻenehana kiʻekiʻe, ua paʻa mau ke koi no nā mea cathode me ka haʻahaʻa haʻahaʻa, ka emissivity uniformity kiʻekiʻe, ka nui o ka hoʻokuʻu ʻana i kēia manawa, a me ka lōʻihi o ke ola.

1.2 ʻO ka ʻoihana hoʻoheheʻe electron beam, me ka hoʻomohala ʻana i ka hoʻokele waiwai, pono i nā mīkini kuʻi uila uila, ka hoʻoheheʻe ʻana i ka uila uila, a me nā mea ʻoki ʻoki me nā cathodes e hiki ke hoʻokō i nā koi o ke kiʻekiʻe o kēia manawa a me ka hana haʻahaʻa haʻahaʻa. Eia nō naʻe, hoʻohana nui nā lako kuʻuna i nā cathodes tungsten (me ka hana pakele kiʻekiʻe a me ka haʻahaʻa haʻahaʻa haʻahaʻa o kēia manawa) ʻaʻole hiki ke hoʻokō i nā koi noi. No laila, ua hoʻololi nā cathodes LaB6 i nā cathodes tungsten me kā lākou hana kiʻekiʻe a ua hoʻohana nui ʻia i ka ʻoihana hoʻoheheʻe electron beam.

1.3Ma ka ʻenehana hoʻāʻo ʻenehana kiʻekiʻe,LaB6Hoʻohana ka cathode i kona ʻālohilohi kiʻekiʻe, ola lōʻihi a me nā hiʻohiʻona ʻē aʻe e hoʻololi i nā mea cathode wela kahiko e like me ka tungsten cathode i nā lako uila e like me nā microscopes electron, Auger spectrometers, a me nā koho electron.

1.4Ma ka ʻoihana accelerator, ʻoi aku ka kiʻekiʻe o ka LaB6 e kūʻē i ka pōʻino ion i hoʻohālikelike ʻia me ka tungsten kuʻuna a me ka tantalum. Ma ka hopena,LaB6Hoʻohana nui ʻia nā cathodes i nā mea holo wikiwiki me nā ʻano like ʻole e like me synchrotron a me cyclotron accelerators.

1.5KaLaB6Hiki ke hoʻohana ʻia ka cathode i nā paipu hoʻokuʻu kinoea, nā paipu laser, a me nā mea hoʻonui ʻano magnetron i ka ʻoihana 1.5 discharge tube.

2. ʻO LaB6, ma ke ʻano he mea uila i ka ʻenehana hou, hoʻohana nui ʻia i nā ʻoihana kīwila a me ka pale.

2.1 Electron emission cathode. Ma muli o ka hana haʻahaʻa electron pakele, hiki ke loaʻa nā mea cathode me ka kiʻekiʻe o ka hoʻokuʻu ʻana i kēia manawa i nā mahana waena, ʻoi aku ka maikaʻi o nā kristal hoʻokahi, ʻo ia nā mea kūpono no nā cathodes electron emission kiʻekiʻe.

2.2 Kiʻekiʻe olinolino kumu kukui. ʻO nā mea nui i hoʻohana ʻia no ka hoʻomākaukau ʻana i nā microscopes electron, e like me nā kānana optical, nā monochromators diffraction X-ray palupalu, a me nā kumu kukui uila uila ʻē aʻe.

2.3 ʻO ke kūpaʻa kiʻekiʻe a me nā ʻōnaehana ola ola kiʻekiʻe. ʻO kāna hana hoʻokō maikaʻi loa e hiki ai ke hoʻohana i nā ʻōnaehana uila uila like ʻole, e like me ke kahakaha ʻana i ka beam electron, nā kumu wela electron beam, nā pū wili uila uila, a me nā accelerators, no ka hana ʻana i nā mea hana kiʻekiʻe ma nā kahua ʻenekinia.

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