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What is Diffusion in Solids?


Diffusion is the process of movement of atoms from high concentration to low concentration in a material. Adolf Fick first discussed the molecular diffusion in binary components. Fick’s first law of diffusion for a binary mixture depends on flux, diffusion velocity, molar concentration, and temperature gradient.
In the diffusion process, atoms change their original positions relative to the adjacent atom due to gradients. The gradient can be a concentration gradient, magnetic gradient, temperature gradient or stress gradient. Diffusion mechanisms involve vacancy diffusion, interstitial diffusion, substitutional diffusion, self-interstitial, self-diffusion, etc.
Diffusion process can be either steady-state or non-steady-state process, which depends on flux i.e. the net number of atoms crossing a unit area per unit time in a particular direction. Some important factors that influence diffusion are diffusing material, temperature, crystal lattice, defects, etc.

Comments

  1. Look at the way my pal Wesley Virgin's tale starts with this SHOCKING AND CONTROVERSIAL video.

    Wesley was in the military-and soon after leaving-he found hidden, "mind control" secrets that the government and others used to get everything they want.

    THESE are the same SECRETS many famous people (notably those who "became famous out of nowhere") and top business people used to become rich and successful.

    You probably know that you utilize only 10% of your brain.

    That's mostly because the majority of your BRAINPOWER is UNCONSCIOUS.

    Perhaps this conversation has even occurred INSIDE your own head... as it did in my good friend Wesley Virgin's head around seven years back, while riding an unregistered, garbage bucket of a car without a driver's license and $3 in his bank account.

    "I'm very frustrated with living check to check! When will I become successful?"

    You've taken part in those types of conversations, isn't it so?

    Your success story is going to be written. You just need to take a leap of faith in YOURSELF.

    Watch Wesley Virgin's Video Now!

    ReplyDelete
  2. In this manner my acquaintance Wesley Virgin's biography launches in this shocking and controversial VIDEO.

    You see, Wesley was in the military-and soon after leaving-he discovered hidden, "self mind control" tactics that the CIA and others used to get whatever they want.

    These are the exact same SECRETS tons of celebrities (notably those who "come out of nothing") and the greatest business people used to become wealthy and famous.

    You probably know that you use less than 10% of your brain.

    That's because most of your brain's power is UNTAPPED.

    Maybe that thought has even taken place IN YOUR own head... as it did in my good friend Wesley Virgin's head seven years ago, while riding an unregistered, beat-up garbage bucket of a car with a suspended license and with $3.20 on his banking card.

    "I'm very fed up with living paycheck to paycheck! When will I finally succeed?"

    You've been a part of those those conversations, isn't it right?

    Your very own success story is waiting to happen. You just have to take a leap of faith in YOURSELF.

    WATCH WESLEY SPEAK NOW

    ReplyDelete

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