Tungsten muaj qhov siab tshaj plaws melting point ntawm tag nrho cov hlau. Nws melting point yog kwv yees li 3,422 degrees Celsius (6,192 degrees Fahrenheit). Tungsten cov ntsiab lus melting siab heev tuaj yeem raug ntaus nqi rau ntau yam tseem ceeb:

1. Strong metallic bonds: Tungsten atoms tsim muaj zog hlau bonds nrog ib leeg, tsim ib tug heev ruaj khov thiab muaj zog lattice qauv. Cov hlau nplaum muaj zog no xav tau lub zog loj kom tawg, ua rau tungsten lub siab melting point.

2. Kev teeb tsa hluav taws xob: Kev teeb tsa hluav taws xob ntawm tungsten plays lub luag haujlwm tseem ceeb hauv nws qhov siab melting point. Tungsten muaj 74 electrons teem nyob rau hauv nws cov atomic orbitals thiab muaj ib tug high degree ntawm electron delocalization, ua rau muaj zog hlau bonding thiab siab cohesive zog.

3. High atomic mass: Tungsten muaj ib qho loj atomic loj, uas ua rau nws muaj zog interatomic kev sib cuam tshuam. Qhov loj ntawm tungsten atoms ua rau muaj qhov siab ntawm inertia thiab ruaj khov nyob rau hauv cov siv lead ua lattice, xav tau ntau lub zog tawm tswv yim los cuam tshuam cov qauv.

4. Refractory khoom: Tungsten yog cais raws li ib tug refractory hlau thiab paub txog nws zoo heev tshav kub tsis kam thiab hnav tsis kam. Nws cov ntsiab lus melting siab yog qhov qhia txog cov yam ntxwv ntawm cov hlau refractory, ua rau nws muaj txiaj ntsig zoo rau kev siv hauv qhov chaw kub kub.

5. Crystal Structure: Tungsten muaj lub cev-centered cubic (BCC) siv lead ua qauv nyob rau hauv chav tsev kub, uas ua rau nws siab melting point. Kev npaj ntawm atoms nyob rau hauv BCC qauv muab kev sib cuam tshuam interatomic muaj zog, txhim kho cov khoom muaj peev xwm tiv taus qhov kub thiab txias.

Tungsten muaj qhov siab tshaj plaws melting point ntawm tag nrho cov hlau vim nws zoo kawg nkaus ua ke ntawm cov hlau nplaum muaj zog, electron configuration, atomic mass, thiab siv lead ua qauv. Cov cuab yeej tshwj xeeb no ua rau tungsten indispensable rau cov ntawv thov uas xav tau cov khoom siv los tswj nws cov qauv kev ntseeg siab ntawm qhov kub siab heev, xws li aerospace, hluav taws xob tiv tauj thiab cov khoom siv hluav taws xob kub kub.

Molybdenum muaj lub cev-centered cubic (BCC) crystal qauv ntawm chav tsev kub. Hauv qhov kev npaj no, molybdenum atoms nyob ntawm cov ces kaum thiab qhov nruab nrab ntawm lub voos xwmfab, tsim kom muaj kev ruaj khov thiab nruj nreem ntim cov lattice qauv. Molybdenum's BCC siv lead ua qauv pab ua kom nws lub zog, ductility thiab kub-resistant, ua rau nws yog ib qho tseem ceeb ntawm cov khoom siv rau ntau yam kev lag luam, xws li aerospace, high-temperature furnaces thiab structural Cheebtsam uas tiv taus huab cua.