Lanthanum hexaboride LaB6 paʻu
Fa'amatalaga puupuu:
Lanthanum hexaborateo se fa'ameamea e le fa'ameamea e aofia ai le valence boron maualalo ma seasea u'amea elemene lanthanum, lea ei ai se fausaga tioata faapitoa ma uiga faavae o borides. Mai le va'aiga o meafaitino, lanthanum hexaborate LaB6 o lo'o i totonu o se u'amea refractory fa'atasi ma se fausaga tioata kupita. O loʻo i ai mea sili ona lelei e pei o le maualuga o le maʻaʻa, maualuga le amio, maualuga le faʻafefeteina, maualalo le maualuga o le faʻalauteleina o le vevela, ma le mautu lelei o vailaʻau. I le taimi lava e tasi, o le lanthanum hexaborate e tuʻuina atu le maualuga o le taimi nei ma le maualalo o le faʻafefe o le vevela i le maualuga o le vevela, ma e malosi le tetee atu i le osofaʻi o le ion, malosi eletise eletise, ma le faʻavevela. Ua faʻaaogaina i mea cathode, electron microscopy, electron beam welding Talosaga i fanua e manaʻomia ai le maualuga o le eletise, e pei o paipa faʻafefe.
Lanthanum hexaborateo lo'o i ai mea tau kemikolo mautu ma e le tali atu i le vai, okesene, po'o le hydrochloric acid; I le vevela o le potu, e na o le tali atu i le nitric acid ma le aqua regia; Oxidation e na'o le 600-700 ℃ e tupu ile atemosifia aerobic. I totonu o se atemosifia gaogao, o mea LaB6 e faigofie ona faʻafefe ma isi mea poʻo kasa e fausia ai mea faʻafefeteina maualalo; I le maualuga o le vevela, o mea na fausia o le a faʻaauau pea ona faʻafefe, faʻaalia le maualalo o le sola i luga o le galuega o le lanthanum hexaborate tioata i luga o le faʻafefe, ma faʻapea ona tuʻuina atu le lanthanum hexaborate sili atu le malosi o le faʻamaʻi oona.
O lelanthanum hexaboratecathode e maualalo fua faatatau evaporation ma le ola auaunaga umi i le vevela maualuga. Pe a vevela i se vevela maualuga, o le uʻamea lanthanum atoms i luga e maua ai avanoa ona o le aveesea o le gaogao, ae o le totonugalemu uʻamea lanthanum atoms e salalau foi e faaopoopo avanoa, tausia le fausaga o le boron auivi e le suia. O lenei meatotino e fa'aitiitia ai le fa'asao o le LaB6 cathode ma fa'atumauina ai le fa'aogaina o le cathode i le taimi e tasi. I le tutusa emission density i le taimi nei, o le fua faatatau evaporation o mea cathode LaB6 i le vevela maualuga e maualalo ifo nai lo mea lautele cathode, ma maualalo fua faatatau evaporation o se vaega taua i le faalauteleina o le ola auaunaga o cathodes.
Igoa Oloa | Lanthanum hexaboride |
Numera CAS | 12008-21-8 |
fua mole | oona o le lanthanum hexaboride |
mamafa mole | 203.77 |
Fa'aaliga | paʻu paʻepaʻe / granules |
Malosi | 2.61 g/mL ile 25C |
Lisi Lisi | 2530C |
MF | LaB6 |
Fa'asao tumau | 29A/cm2·K2 |
Fa'asao i le taimi nei le mamafa | 29Acm-2 |
Tete'e i le vevela o le potu | 15~27μΩ |
Oxidation vevela | 600℃ |
foliga tioata | pusa |
lattice tumau | 4.157A |
galuega faatino | 2.66eV |
Coefficient fa'alauteleina vevela | 4.9×10-6K-1 |
Malosi Vickers (HV) | 27.7Gpa |
Fa'ailoga | Xinglu |
Talosaga:
1. Lanthanum hexaborate LaB6 cathode mea
O le maualuga o le fa'aosoina o le taimi nei ma le maualalo o le fa'asao i le maualuga o le vevela oLaB6 lanthanum hexaboratefaia o se mea cathode ma faatinoga maualuga, faasolosolo suia nisi o cathodes tungsten i talosaga alamanuia. I le taimi nei, o vaega autu o le faʻaogaina o mea faʻapipiʻi LaB6 ma le lanthanum hexaborate e faʻapea:
1.1 Alamanuia fou faatekonolosi e pei o masini faaeletonika gaogao microwave ma ion thrusters i militeri ma avanoa faatekonolosi fanua, faʻaaliga ma ata faʻataʻitaʻiga ma faʻamalamalamaga maualuga ma maualuga emissivity i le taimi nei e manaʻomia e alamanuia lautele ma militeri, ma leisa eletise eletise. I nei alamanuia maualuga-tekonolosi, o le manaoga mo mea cathode ma le maualalo o le vevela, maualuga le tutusa emissivity, maualuga maualuga emission i le taimi nei, ma le umi o le olaga e masani lava ona fufusi.
1.2 O le eletise eletise eletise eletise, faatasi ai ma le atinaʻeina o le tamaoaiga, e manaʻomia ai masini faʻapipiʻi eletise eletise, faʻafefeteina eletise eletise, ma meafaigaluega tipi ma cathodes e mafai ona ausia manaʻoga o le maualuga o le taimi nei ma le maualalo o galuega sola. Ae ui i lea, o meafaigaluega masani e masani ona faʻaaogaina tungsten cathodes (faʻatasi ai ma le maualuga o le sola ese ma le maualalo o le gaosiga o loʻo i ai nei) e le mafai ona ausia manaʻoga. O le mea lea, LaB6 cathodes ua suia tungsten cathodes ma latou faatinoga maualuga ma ua faʻaaogaina lautele i le eletise eletise eletise alamanuia.
1.3I totonu o le alamanuia meafaigaluega su'ega tekonolosi,LaB6fa'aaogaina e le cathode lona malamalama maualuga, umi le ola ma isi uiga e sui ai mea masani cathode vevela e pei o le tungsten cathode i masini faaeletonika e pei o microscopes electron, auger spectrometers, ma electron probes.
1.4I totonu o le alamanuia faʻavavevave, LaB6 e maualuga atu le mautu e faasaga i le pomu ion pe a faʻatusatusa i le tungsten masani ma le tantalum. O le faaiuga,LaB6cathodes o loʻo faʻaaogaina lautele i accelerators ma fausaga eseese e pei o synchrotron ma cyclotron accelerators.
1.5O leLaB6e mafai ona faaaogaina cathode i tubes lafoai kasa, tubes leisa, ma magnetron ituaiga amplifiers i le alamanuia faagaau 1.5 lafoaia.
2. LaB6, o se vaega faaeletonika i tekinolosi faʻaonaponei, e faʻaaogaina lautele i pisinisi faʻalapotopotoga ma puipuiga:
2.1 Electron emission cathode. Ona o le maualalo o le eletise sola galuega, o mea cathode ma le maualuga emission i le taimi nei i le vevela e mafai ona maua, aemaise lava tioata tasi tulaga maualuga, o mea lelei mo cathodes eletise eletise maualuga.
2.2 Malamalama maualuga puna malamalama. O vaega autu o lo'o fa'aaogaina mo le sauniaina o microscopes eletonika, e pei o filiga mata'utia, monochromators fa'a'ese'esega o le X-ray vaivai, ma isi fa'apogai o moli eletise.
2.3 Mautu maualuga ma maualuga le ola ola vaega vaega. O lona fa'atinoga lelei atoatoa e mafai ai ona fa'aogaina i le tele o faiga fa'aeletonika, e pei o le togitogiga o le eletise eletise, fa'apogai vevela eletise eletise, fana u'amea eletise, ma fa'avavevave, mo le gaosiga o vaega maualuga-fa'atinoga i fanua fa'ainisinia.
Fa'amatalaga:
MEA | FAAMATALAGA | I'UGA O SU'ESU'EGA |
La(%,min) | 68.0 | 68.45 |
B(%, min) | 31.0 | 31.15 |
lanthanum hexaborideoona/(TREM+B)(%,min) | 99.99 | 99.99 |
TREM+B(%,min) | 99.0 | 99.7 |
RE Fa'aleaga(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 | |
E le toe fa'aleagaina(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 | |
Lapopo'a (μM) | 50 nanometers- 360 mesh- 500 mesh; Fa'apitoa e tusa ai ma mana'oga o tagata fa'atau | |
Fa'ailoga | Xinglu |
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