I-Lanthanum hexaboride LaB6 powder
Ulwazi olufushane:
I-Lanthanum hexaborateiyinhlanganisela ye-inorganic non-metallic eyakhiwe nge-valence boron ephansi kanye ne-rare element yensimbi i-lanthanum, enesakhiwo sekristalu esikhethekile nezici eziyisisekelo zama-boride. Ngokombono wezakhiwo ezibonakalayo, i-lanthanum hexaborate LaB6 ingeyenhlanganisela yensimbi ye-refractory ene-cubic crystal structure. Inezici ezinhle kakhulu ezinjengokuqina okuphezulu, ukuqhutshwa okuphezulu, indawo ephezulu yokuncibilika, i-coefficient ephansi yokwanda okushisayo, nokuzinza okuhle kwamakhemikhali. Ngesikhathi esifanayo, i-lanthanum hexaborate ikhipha ukuminyana okuphezulu kwamanje kanye nezinga eliphansi lokuhwamuka emazingeni okushisa aphezulu, futhi inokumelana okuqinile nokuqhuma kwamabhomu e-ion, insimu enamandla kagesi, nemisebe. Isetshenziswe ezintweni ze-cathode, i-electron microscopy, i-electron beam welding Izicelo emikhakheni edinga imisinga yokukhishwa okuphezulu, njengamashubhu okukhipha.
I-Lanthanum hexaborateinamakhemikhali azinzile futhi ayiphenduli ngamanzi, umoya-mpilo, noma ngisho ne-hydrochloric acid; Emazingeni okushisa asekamelweni, isabela kuphela nge-nitric acid ne-aqua regia; I-oxidation ivela kuphela ku-600-700 ℃ endaweni ye-aerobic. Emkhathini we-vacuum, impahla ye-LaB6 ijwayele ukusabela nezinye izinto noma amagesi ukuze kwakhe izinto ezincibilika eziphansi; Emazingeni okushisa aphezulu, izinto ezakhiwe zizoqhubeka zihwamuke, zidalule indawo ephansi yokusebenza yokuphunyuka yekristalu ye-lanthanum hexaborate endaweni ekhishwayo, ngaleyo ndlela inikeze i-lanthanum hexaborate ikhono elihle kakhulu lokulwa nobuthi.
Ii-lanthanum hexaborateI-cathode inezinga eliphansi lokuhwamuka kanye nempilo ende yesevisi emazingeni okushisa aphezulu. Lapho ishiselwa ezingeni lokushisa eliphakeme, i-athomu yensimbi engaphezulu ye-lanthanum ikhiqiza izikhala ngenxa yokuhwamuka kokulahlekelwa, kuyilapho ama-athomu ensimbi angaphakathi e-lanthanum nawo asakazeka ukuze angezele izikhala, ukugcina uhlaka lwe-boron lungaguquki. Lesi sakhiwo sinciphisa ukulahleka kokuhwamuka kwe-LaB6 cathode futhi sigcina indawo esebenzayo ye-cathode ngesikhathi esifanayo. Ngesikhathi esifanayo sokuminyana kwamanje, izinga lokuhwamuka kwezinto ze-cathode ze-LaB6 emazingeni okushisa aphezulu liphansi kunelezinto ezivamile ze-cathode, futhi izinga lokuhwamuka eliphansi liyisici esibalulekile ekwandiseni impilo yesevisi yama-cathode.
| Igama Lomkhiqizo | I-Lanthanum hexaboride |
| Inombolo ye-CAS | 12008-21-8 |
| Ifomula yamangqamuzana | ubuthi be-lanthanum hexaboride |
| Isisindo samangqamuzana | 203.77 |
| Ukubukeka | impushana emhlophe / ama-granules |
| Ukuminyana | 2.61 g/mL ku-25C |
| I-Melting Point | 2530C |
| MF | I-LaB6 |
| Ukukhishwa njalo | 29A/cm2·K2 |
| Ukuminyana kwamanje kokukhiphayo | 29Acm-2 |
| Ukumelana nezinga lokushisa kwegumbi | 15 - 27μΩ |
| Izinga lokushisa kwe-oxidation | 600℃ |
| Ifomu le-Crystal | ikhiyubhu |
| i-lattice njalo | 4.157A |
| umsebenzi womsebenzi | 2.66eV |
| I-coefficient yokwandisa ukushisa | 4.9×10-6K-1 |
| Ukuqina kwe-Vickers (HV) | 27.7Gpa |
| Ibhrendi | Xinglu |
Isicelo:
1. I-Lanthanum hexaborate LaB6 cathode material
I-high emission current density kanye nezinga eliphansi lokuhwamuka emazingeni okushisa aphezulu weI-LaB6 lanthanum hexaborateyenze ibe yimpahla ye-cathode ngokusebenza okuphezulu, kancane kancane ishintshe amanye ama-tungsten cathodes kuzicelo zezimboni. Njengamanje, izindawo eziyinhloko ezisetshenziswayo ze-LaB6 cathode materials ezine-lanthanum hexaborate zimi kanje:
1.1 Izimboni ezintsha zobuchwepheshe ezifana nemishini kagesi ye-microwave vacuum kanye nama-ion thruster emkhakheni wezempi nobuchwepheshe basemkhathini, izinto zokubonisa nezithombe ezinencazelo ephezulu kanye nokukhipha umoya okuphezulu kwamanje okudingwa izimboni zomphakathi nezempi, namalaser e-electron beam. Kulezi zimboni zobuchwepheshe obuphezulu, isidingo sezinto ezisetshenziswayo ze-cathode ezinezinga lokushisa eliphansi, ukukhishwa kwegesi okufanayo okuphezulu, ukuminyana okuphezulu kokuphumayo kwamanje, nokuphila isikhathi eside bekulokhu kuqinile kakhulu.
1.2 Imboni yokushisela i-electron beam, ngokuthuthuka komnotho, idinga imishini yokushisela i-electron beam, ukuncibilika kwe-electron beam, nezinto zokusika ezinama-cathodes ezingahlangabezana nezidingo zokuminyana okuphezulu kwamanje nomsebenzi wokuphunyuka ophansi. Kodwa-ke, okokusebenza kwendabuko kusetshenziswa ikakhulukazi ama-tungsten cathodes (anomsebenzi wokuphunyuka okuphezulu kanye nokuminyana okuphumayo okuphansi kwamanje) angakwazi ukuhlangabezana nezidingo zohlelo. Ngakho-ke, ama-cathodes e-LaB6 athathe indawo yama-tungsten cathode ngokusebenza kwawo okuphezulu futhi asetshenziswe kabanzi embonini yokushisela i-electron beam.
1.3Embonini yezinsimbi zokuhlola zobuchwepheshe obuphezulu,I-LaB6I-cathode isebenzisa ukukhanya kwayo okuphezulu, ubude besikhathi eside kanye nezinye izici esikhundleni sezinto zendabuko ezishisayo ze-cathode njenge-tungsten cathode emishinini kagesi efana nama-electron microscopes, ama-Auger spectrometers, nama-electron probes.
1.4Embonini ye-accelerator, i-LaB6 inokuqina okuphezulu ngokumelene nokuqhuma kwe-ion uma kuqhathaniswa ne-tungsten evamile ne-tantalum. Ngenxa yalokho,I-LaB6ama-cathodes asetshenziswa kabanzi kuma-accelerator anezakhiwo ezahlukene ezifana ne-synchrotron ne-cyclotron accelerators.
1.5I-LaB6I-cathode ingasetshenziswa kumashubhu okukhipha igesi, amashubhu e-laser, kanye nama-amplifiers ohlobo lwe-magnetron embonini ye-tube yokukhipha i-1.5.
2. I-LaB6, njengengxenye ye-elekthronikhi kubuchwepheshe besimanje, isetshenziswa kakhulu ezimbonini zomphakathi nezokuvikela:
2.1 I-electron emission cathode. Ngenxa yomsebenzi ophansi wokuphunyuka kwama-electron, izinto zokwakha ze-cathode ezinezinga eliphezulu kakhulu lokuphuma emazingeni okushisa aphakathi nendawo zingatholakala, ikakhulukazi amakristalu angawodwa ekhwalithi ephezulu, okuyizinto ezisetshenziswayo ezilungele ama-cathode akhipha amandla ama-electron aphezulu.
2.2 Umthombo wokukhanya wephoyinti lokukhanya okuphezulu. Izingxenye eziyinhloko ezisetshenziselwa ukulungisa ama-electron microscopes, njengezihlungi zamehlo, ama-monochromator athambile we-X-ray, neminye imithombo yokukhanya ye-electron beam.
2.3 Ukuzinza okuphezulu nezingxenye zesistimu yokuphila isikhathi eside. Ukusebenza kwayo okuhle kakhulu kuvumela ukusetshenziswa kwayo ezinhlelweni ezihlukahlukene ze-electron beam, njengokuqoshwa kwe-electron beam, imithombo yokushisa ye-electron beam, izibhamu zokushisela i-electron beam, nama-accelerator, ukuze kukhiqizwe izingxenye ezisebenza kahle kakhulu emikhakheni yobunjiniyela.
Ukucaciswa:
| ITEM | IMICIMBI | IMIPHUMELA YOKUHLOLA |
| La(%,min) | 68.0 | 68.45 |
| B(%,min) | 31.0 | 31.15 |
| i-lanthanum hexaborideubuthi/(TREM+B)(%,min) | 99.99 | 99.99 |
| TREM+B(%,min) | 99.0 | 99.7 |
| RE Ukungcola(ppm/TREO,Max) | ||
| Ce | 3.5 | |
| Pr | 1.0 | |
| Nd | 1.0 | |
| Sm | 1.0 | |
| Eu | 1.3 | |
| Gd | 2.0 | |
| Tb | 0.2 | |
| Dy | 0.5 | |
| Ho | 0.5 | |
| Er | 1.5 | |
| Tm | 1.0 | |
| Yb | 1.0 | |
| Lu | 1.0 | |
| Y | 1.0 | |
| Non-Re Ukungcola(ppm,Max) | ||
| Fe | 300.0 | |
| Ca | 78.0 | |
| Si | 64.0 | |
| Mg | 6.0 | |
| Cu | 2.0 | |
| Cr | 5.0 | |
| Mn | 5.0 | |
| C | 230.0 | |
| Usayizi wezinhlayiya (μ M) | 50 nanometers- 360 mesh- 500 anezikhala; Kwenziwe ngokwezifiso ngokwezidingo zekhasimende | |
| Ibhrendi | Xinglu | |
Isitifiketi:
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