Cov Khoom Ntawm Tantalum
| Tus lej atomic | 73 |
| Tus lej CAS | 7440-25-7 |
| Qhov hnyav ntawm lub atomic | 180.95 |
| Qhov kub yaj | 2 996 °C |
| Kub taw tes | 5 450 °C |
| Qhov ntim ntawm atomic | 0.0180 nm3 |
| Qhov Ceev ntawm 20 ° C | 16.60g/cm³ |
| Cov qauv siv lead ua | lub cev-centered cubic |
| Lattice tas li | 0.3303 [nm] |
| Kev nplua mias hauv lub ntiaj teb lub crust | 2.0 [g/t] |
| Qhov ceev ntawm lub suab | 3400m/s (ntawm rt) (qws nyias) |
| Kev nthuav dav thermal | 6.3 µm/(m·K) (ntawm 25 °C) |
| Kev ua kom sov tau zoo | 173 W/(m·K) |
| Kev tiv thaiv hluav taws xob | 131 nΩ·m (ntawm 20 ° C) |
| Mohs hardness | 6.5 |
| Vickers hardness | 870-1200Mpa |
| Brinell hardness | 440-3430Mpa |
Tantalum yog ib yam tshuaj lom neeg uas muaj lub cim Ta thiab tus lej atomic 73. Yav tas los hu ua tantalium, nws lub npe los ntawm Tantalus, tus neeg phem los ntawm Greek mythology. Tantalum yog ib yam hlau hloov pauv tsis tshua muaj, tawv, xiav-grey, ci ntsa iab uas tiv taus xeb heev. Nws yog ib feem ntawm pawg hlau refractory, uas siv dav ua cov khoom me me hauv cov hlau sib xyaw. Qhov tsis muaj zog ntawm tantalum ua rau nws yog ib yam khoom muaj nqis rau cov khoom siv hauv chaw kuaj mob thiab hloov platinum. Nws siv tseem ceeb niaj hnub no yog hauv tantalum capacitors hauv cov khoom siv hluav taws xob xws li xov tooj ntawm tes, DVD players, video game systems thiab computers. Tantalum, ib txwm ua ke nrog cov tshuaj lom neeg zoo sib xws niobium, tshwm sim hauv cov pawg minerals tantalite, columbite thiab coltan (kev sib xyaw ntawm columbite thiab tantalite, txawm hais tias tsis lees paub tias yog ib hom minerals sib cais). Tantalum yog suav tias yog ib qho khoom tseem ceeb hauv thev naus laus zis.
Cov khoom siv lub cev
Tantalum yog xim tsaus (xiav-grey), ntom, ductile, tawv heev, yooj yim tsim, thiab muaj zog heev ntawm cua sov thiab hluav taws xob. Cov hlau no paub zoo rau nws txoj kev tiv thaiv corrosion los ntawm acids; qhov tseeb, ntawm qhov kub hauv qab 150 ° C tantalum yuav luag tsis muaj zog tiv thaiv los ntawm aqua regia uas feem ntau tawm tsam. Nws tuaj yeem yaj nrog hydrofluoric acid lossis cov kua qaub uas muaj fluoride ion thiab sulfur trioxide, nrog rau cov kua ntawm potassium hydroxide. Tantalum lub ntsiab lus yaj siab ntawm 3017 ° C (kub point 5458 ° C) yog tshaj ntawm cov ntsiab lus tsuas yog los ntawm tungsten, rhenium thiab osmium rau cov hlau, thiab carbon.
Tantalum muaj ob theem crystalline, alpha thiab beta. Theem alpha yog ductile thiab mos; nws muaj lub cev-centered cubic qauv (chaw pawg Im3m, lattice tas li a = 0.33058 nm), Knoop hardness 200–400 HN thiab hluav taws xob resistivity 15–60 µΩ⋅cm. Theem beta yog tawv thiab brittle; nws cov crystal symmetry yog tetragonal (chaw pawg P42/mnm, a = 1.0194 nm, c = 0.5313 nm), Knoop hardness yog 1000–1300 HN thiab hluav taws xob resistivity yog siab ntawm 170–210 µΩ⋅cm. Theem beta yog metastable thiab hloov mus rau theem alpha thaum cua sov rau 750–775 °C. Cov tantalum loj yuav luag tag nrho yog alpha theem, thiab beta theem feem ntau muaj nyob rau hauv cov yeeb yaj kiab nyias tau los ntawm magnetron sputtering, tshuaj lom neeg vapor deposition lossis electrochemical deposition los ntawm eutectic molten ntsev kua.
Cov Khoom Kub ntawm Tantalum
