Qhov txawv ntawm Tus Kheej Diffusion thiab Interdiffusion yog dab tsi

2024 Tus sau: Alex Aldridge | [email protected]. Kawg hloov kho: 2023-12-17 13:40

Qhov sib txawv tseem ceeb ntawm tus kheej diffusion thiab interdiffusion yog tus kheej diffusion yog hais txog kev tsiv teb tsaws ntawm atomic hauv cov hlau ntshiab thaum tag nrho cov atoms hauv cov qauv siv lead ua uas pauv txoj haujlwm yog tib yam, whereas interdiffusion yog hais txog kev tawg ntawm atoms. ntawm ib lub hlau mus rau lwm lub hlau.

Tus kheej diffusion piav qhia txog kev hloov pauv ntawm txoj haujlwm ntawm cov atoms hauv lub ntsej muag. Interdiffusion, ntawm qhov tod tes, tuaj yeem piav qhia raws li kev sib pauv ntawm cov atoms hla ob cov ntaub ntawv uas muaj kev sib cuag. Feem ntau, cov txheej txheem ntawm tus kheej diffusion yog qhov sib piv qeeb dua li cov txheej txheem interdiffusion, thaum interdiffusion yog nrawm dua li ntau lwm cov txheej txheem diffusion uas tuaj yeem tshwm sim hauv cov iav siv lead ua.

Dab tsi yog qhov Diffusion?

Tus kheej diffusion piav qhia txog kev hloov pauv ntawm txoj haujlwm ntawm cov atoms hauv lub ntsej muag. Feem ntau, nws tus kheej diffusion tshwm sim los ntawm qhov chaw seem. Peb tuaj yeem siv qhov parameter hu ua diffusion coefficient, uas ntsuas qhov kev txav mus los ntawm hom diffuse. Lub xub ntiag ntawm haiv neeg taw tes tsis xws luag yog pab tau nyob rau hauv hom diffusion txheej txheem. Qhov no txhais tau hais tias tus kheej diffusion hauv semiconductors feem ntau yog kho los ntawm cov ntsiab lus hauv ib txwm muaj. Cov kev tsis xws li no suav nrog qhov chaw ua haujlwm thiab tus kheej-interstitials.

Tus kheej-diffusion coefficient yog diffusion coefficient D_{i ntawm hom kuv thaum cov tshuaj muaj peev xwm gradient sib npaug rau xoom. Qhov sib npaug uas txuas cov kev ntsuas no yog raws li hauv qab no:}

D_i=D_i(∂lnc_i/∂lna _i)

Nyob rau hauv kab zauv saum toj no, a_i yog hais txog kev ua ntawm hom kuv hauv kev daws, hos c_{i yog qhov concentration ntawm kuv. Feem ntau, peb xav tias lo lus no yog sib npaug rau cov kab mob sib kis uas tau txiav txim siab los ntawm kev soj ntsuam kev txav ntawm cov isotope hauv cov khoom txaus siab.}

Kev sib cuam tshuam yog dab tsi?

Interdiffusion tuaj yeem piav qhia raws li tus txheej txheem ntawm kev sib pauv ntawm cov atoms hla ob cov ntaub ntawv uas tau sib cuag. Hom diffusion no yog ua los ntawm cov tshuaj muaj peev xwm gradient hla cov ciam teb. Hauv cov lus yooj yim, interdiffusion yog qhov sib txawv ntawm atoms ntawm ib lub hlau mus rau lwm cov hlau.

Interdiffusion feem ntau tshwm sim los ntawm kev sib cuam tshuam uas tau tsim nyob rau hauv dentine los ntawm kev nkag mus ntawm cov nplaum nplaum resin. Qhov kev sib tshuam no nyob nruab nrab ntawm cov ntaub ntawv siv cov khoom siv sib xyaw thiab cov khoom sib sib zog nqus-dawb dentine. Feem ntau, interdiffusion yog sai dua li tus kheej diffusion thiab vacancy diffusion. Qhov no yog vim qhov kev sib txuas ntawm interstitials rau cov atoms nyob ib puag ncig feem ntau tsis muaj zog, thiab muaj ntau qhov chaw sib cuam tshuam hauv qhov kev sib tshuam ntawm cov txheej txheem interdiffusion piv rau qhov chaw seem mus dhia mus.

Qhov txawv ntawm Tus Kheej Diffusion thiab Interdiffusion yog dab tsi?

Tus kheej diffusion piav qhia txog kev hloov pauv ntawm txoj haujlwm ntawm cov atoms hauv cov siv lead ua. Meanwhile, interdiffusion yog txheej txheem ntawm diffusional pauv ntawm atoms hla ob cov ntaub ntawv uas nyob rau hauv kev sib cuag. Qhov sib txawv tseem ceeb ntawm tus kheej diffusion thiab interdiffusion yog tus kheej diffusion yog hais txog kev tsiv teb tsaws ntawm atomic hauv cov hlau ntshiab thaum tag nrho cov atoms nyob rau hauv cov qauv siv lead ua uas pauv txoj hauj lwm yog tib yam, whereas interdiffusion yog hais txog qhov diffusion ntawm atoms ntawm ib tug hlau mus rau lwm tus. hlau.

Cov hauv qab no qhia txog qhov sib txawv ntawm tus kheej diffusion thiab interdiffusion hauv daim ntawv tabular rau ib sab ntawm kev sib piv.

Summary – Self Diffusion vs Interdiffusion

Muaj ntau hom diffusions uas tuaj yeem tshwm sim hauv cov iav siv lead ua, xws li tus kheej diffusion thiab interdiffusion. Qhov sib txawv tseem ceeb ntawm tus kheej diffusion thiab interdiffusion yog tias nws tus kheej diffusion yog hais txog atomic migration hauv cov hlau ntshiab thaum tag nrho cov atoms nyob rau hauv cov qauv siv lead ua uas pauv txoj hauj lwm yog tib yam, whereas interdiffusion hais txog qhov diffusion ntawm atoms ntawm ib tug hlau mus rau lwm tus. hlau.