Lanthanum hexaboride LaB6 budada
Xog kooban:
Lanthanum hexaboratewaa iskudhis aan organic ahayn oo aan bir ahayn oo ka kooban boron valence hooseeya iyo bir dhif ah oo lanthanum, kaas oo leh qaab dhismeed gaar ah iyo sifooyinka aasaasiga ah ee borides. Marka loo eego sifooyinka walxaha, lanthanum hexaborate LaB6 waxaa iska leh isku dhafka birta ah ee dib u soo celinta oo leh qaab-dhismeedka crystal cubic. Waxay leedahay sifooyin aad u fiican sida qallafsanaan sare, korriin sare, barta dhalaalida sare, fidinta kulaylka hooseeya, iyo xasilloonida kiimikada wanaagsan. Isla mar ahaantaana, lanthanum hexaborate waxay soo saartaa cufnaanta hadda jirta iyo heerka uumi-baxa hooseeya ee heerkul sare, waxayna leedahay iska caabin adag oo ay u leedahay bamka ion, beer koronto oo xooggan, iyo shucaac. Waxaa loo adeegsaday qalabka cathode, microscopy elektarooniga ah, alxanka alxanka alxanka elektarooniga ah Codsiyada goobaha u baahan qulqulka hawada sare, sida tuubooyinka dareeraha.
Lanthanum hexaboratewuxuu leeyahay sifooyin kiimikaad oo deggan oo aan ka falcelin biyo, oksijiin, ama xitaa hydrochloric acid; Heerkulka qolka, waxay kaliya la falgashaa nitric acid iyo aqua regia; Oxidation kaliya waxay ku dhacdaa 600-700 ℃ jawiga hawada hawada. Jawiga faaruq ah, walxaha LaB6 waxay u nugul yihiin inay la falgalaan walxo kale ama gaasaska si ay u sameeyaan walxo dhalaalaysa oo hooseeya; Heerkulka sare, walxaha la sameeyay ayaa si joogto ah uumi bixi doona, iyaga oo soo bandhigaya shaqada baxsan ee hoose ee kristal lanthanum hexaborate ee dusha sare ee qiiqa, taas oo siinaysa lanthanum hexaborate awood aad u fiican oo ka hortag ah.
Thelanthanum hexaboratecathode waxay leedahay heerka uumi-baxa hooseeya iyo nolol adeeg oo dheer oo heerkul sare ah. Marka lagu kululeeyo heerkul sare, atomyada lanthanum biraha dusha sare waxay dhaliyaan boosas ay sabab u tahay luminta uumi-baxa, halka atomyada gudaha ee lanthanum ay sidoo kale ku faafaan si ay u kabaan boosaska banaan, iyaga oo ilaalinaya qaabdhismeedka boron-ka oo aan isbeddelin. Hantidani waxay yaraynaysaa uumiga luminta LaB6 cathode waxayna ilaalisaa dusha cathode firfircoon isku mar. Isla cufnaanta hadda la sii daayo, heerka uumiga ee agabka cathode ee LaB6 heerkulka sare wuu ka hooseeyaa kan walxaha cathode guud, iyo heerka uumiga hooseeya waa arrin muhiim ah oo lagu kordhinayo nolosha adeegga cathodes.
Magaca Alaabta | Lanthanum hexaboride |
Lambarka CAS | 12008-21-8 |
qaacidada molecular | suntan lanthanum hexaboride |
Miisaanka molecular | 203.77 |
Muuqashada | budada cad / granules |
Cufnaanta | 2.61 g/ml oo ah 25C |
Meesha dhalaalaysa | 2530C |
MF | LaB6 |
Sii daayo joogto ah | 29A/cm2·K2 |
Cufnaanta hadda jirta | 29Acm-2 |
Iska caabinta heerkulka qolka | 15~27μΩ |
Heerkulka oksidation | 600 ℃ |
Qaabka crystal | cube |
shabag joogto ah | 4.157A |
shaqada shaqada | 2.66eV |
Isku xidhka balaadhinta kulaylka | 4.9×10-6K-1 |
Vickers hardness (HV) | 27.7Gpa |
Summada | Xinglu |
Codsiga:
1. Lanthanum hexaborate LaB6 walxaha cathode
Cufnaanta qiiqa sare ee hadda iyo heerka uumi-baxa hooseeya ee heerkulka sare eeLaB6 lanthanum hexaborateka dhig walxaha cathode leh waxqabadka sare, si tartiib tartiib ah u beddela qaar ka mid ah cathodes tungsten ee codsiyada warshadaha. Waqtigan xaadirka ah, meelaha ugu weyn ee laga codsado agabka LaB6 cathode ee leh lanthanum hexaborate waa sida soo socota:
1.1 Warshadaha cusub ee tignoolajiyada sida mikrowave vacuum electronics iyo ion thrusters ee militariga iyo goobaha tignoolajiyada hawada sare, qalabka soo bandhiga iyo sawirida oo leh qeexitaan sare iyo hawada sare ee hadda jirta ee looga baahan yahay warshadaha madaniga ah iyo kuwa militariga, iyo laser beam electron. Warshadahan teknoolajiyada sare leh, baahida loo qabo qalabka cathode ee leh heerkul hooseeya, qiiqa isku midka ah ee sarreeya, cufnaanta hadda jirta, iyo cimriga dheer ayaa had iyo jeer ahaa mid aad u adag.
1.2 Warshadaha alxanka alxanka elektarooniga ah, oo leh horumarinta dhaqaalaha, waxay u baahan tahay mashiinnada alxanka alxanka elektarooniga ah, dhalaalka iftiinka elektarooniga ah, iyo qalabka goynta ee cathodes kuwaas oo buuxin kara shuruudaha cufnaanta sare ee hadda jirta iyo shaqada baxsadka hooseeya. Si kastaba ha ahaatee, qalabka dhaqameed inta badan waxay isticmaalaan tungsten cathodes (oo leh shaqo baxsasho sare iyo cufnaanta hadda jirta) oo aan buuxin karin shuruudaha codsiga. Sidaa darteed, LaB6 cathodes waxay ku beddeleen tungsten cathodes waxqabadkooda sare waxaana si weyn loogu isticmaalay warshadaha alxanka alxanka elektarooniga ah.
1.3 Warshadaha aaladaha tijaabinta tignoolajiyada sare,LaB6cathode waxay isticmaashaa dhalaalkeeda sare, cimriga dheer iyo sifooyinka kale si ay u bedesho agabka cathode kulul ee dhaqanka sida tungsten cathode ee qalabka elektarooniga ah sida microscopes elektarooniga ah, Auger spectrometers, iyo probes elektarooniga ah.
1.4 Warshadaha dardar-gelinta, LaB6 waxay leedahay xasillooni sare oo ka soo horjeeda bambooyinka ion marka la barbar dhigo tungsten-dhaqameedka iyo tantalum. Natiijo ahaan,LaB6cathodes waxaa si weyn loogu isticmaalaa dardar-geliyayaasha leh qaabab kala duwan sida synchrotron iyo cyclotron accelerators.
1.5LaB6cathode waxaa lagu dabaqi karaa tuubooyinka dheecaanka gaaska, tuubooyinka laysarka, iyo amplifiers nooca magnetron ee warshadaha tuubada dareeraha ee 1.5.
2. LaB6, oo ah qayb elektaroonig ah oo ku jirta tignoolajiyada casriga ah, ayaa si weyn loogu isticmaalaa warshadaha rayidka iyo kuwa difaaca:
2.1 Katoode elektaroonig ah. Sababtoo ah shaqada baxsan ee elektarooniga ah ee hooseeya, qalabka cathode ee leh qiiqa ugu sarreeya ee heerkulka dhexdhexaadka ah ayaa la heli karaa, gaar ahaan tayada sare ee kiristaalo, kuwaas oo ah qalabka ugu fiican ee tamarta sare ee dareeraha elektaroonigga ah.
2.2 Isha iftiinka barta dhalaalka sare. Qaybaha asaasiga ah ee loo isticmaalo diyaarinta mikroskoobyada elektarooniga ah, sida filtarrada indhaha, monochromators-ka raajada jilicsan, iyo ilaha kale ee iftiinka iftiinka elektarooniga ah.
2.3 Degenaansho sare iyo qaybaha nidaamka nolosha sare. Waxqabadkeeda dhammaystiran ee heersare ah ayaa awood u siinaya codsigeeda nidaamyada kala duwan ee alwaaxyada elektarooniga ah, sida xardho xardho elektaroonig ah, ilo kulaylka elektarooniga ah, qoryaha alxanka alxanka elektarooniga ah, iyo dardargeliyayaasha, soosaarka qaybaha waxqabadka sare leh ee beeraha injineernimada.
Faahfaahin:
ITEM | QAABKA | Natiijooyinka Imtixaanka |
La(%,min) | 68.0 | 68.45 |
B(%,min) | 31.0 | 31.15 |
lanthanum hexaboridesumowga/(TREM+B)(%,min) | 99.99 | 99.99 |
TREM+B(%,min) | 99.0 | 99.7 |
Waxyaabaha wasakhaysan (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 | |
Waxyaalo aan Dib-u-Cayn (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 | |
Cabbirka walxaha (μM) | 50 nanometer- 360 mesh - 500 mesh; Lagu habeeyey si waafaqsan shuruudaha macaamiisha | |
Summada | Xinglu |
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