Recent content by JDRF85

Thanks! Really, really, thankyou so much, because I was just at a loss here... It makes sense now that you've said it, but I just couldn't figure this one out. Cheers MagnetDave!

The exponent (Keff - 1) will always be between zero and -1 (not just less than 1 as I erroneously wrote in my last post). So in the way that 3^(-1/2) = 1/[3^(1/2)] and 3^(-1/7) = 1/[3^(1/7)], the Scheil equation can be expressed as either Cs/C0 = (1 - fs)^(Keff - 1) or Cs/C0 = 1/[(1 -...

Thanks for the reply, MagnetDave. But I think I have not been clear with my question, so apologies. What I am intererested in is the evolution of the system with constant Keff somewhere between the extremes; as time goes on and solidfication proceeds the solid fraction fs is going to (by...

Hi guys The Scheil equation for the segregation of impurities from a liquid to the solid during solidification is Cs = C0Keff(1 - fs)^(Keff - 1) Cs is the concentration of impurities in the solid C0 is the initial impurity concentration in the liquid Keff is the effective...

Good books: "Microelectronic Materials" by Chris Grovenor (Head of Department of Materials, Oxford University) "Physics of Semiconductor Devices" by Simon Sze and Kwok Ng (over 20,000 citations in the literature) More specificity in the question would be useful to those trying to help you...

Thanks guys. I was thinking about this today and I thought of a similar experiment to find out, using our thermal evaporator. I was going to use a sensitive electronic mass scale to weigh the sample and then pump it down and see if any evaporated. Nice to see other people think that's a...

Hi there Here's another idea, if you like. 1) Measure the work function of your sample, see http://en.wikipedia.org/wiki/Work_function#Measurement" for some techniques; 2) Get a metal with a work function greater than that of your sample, and bring the two materials together to form a...

Hi everyone This is my first post, please be kind! I am part of a research group at Oxford University, UK. We are investigating ways to make multicrystalline Si solar cells more efficient. One of the characterisation techniques we use is electron beam induced conductivity (EBIC)...