Difference in Uiso parameters of ferrite(BCC) and austenite(FCC) at same te

2007-01-25 Thread Pingguang XU
Dear all, Recently I am doing the full profile neutron refinement of an dual phase steel with GSAS software. After I entered a specific temperature, for example, 640C, the software automatically produced a group of default data. When I finished other parameter refinement, I noticed that the U

Re: Strange peaks from grainy Si (data re-attached)

2007-01-25 Thread gregor
Dear Congwu, as you put it, it definitely seems that you don't get out the MoK radiation from your collimator. Control the alignment and make sure the beam hits your sample. best miguel On 25 Jan 2007 at 9:55, [EMAIL PROTECTED] wrote: > Hi, Miguel, the unit is the so-called moment transfer

Re: Strange peaks from grainy Si (data re-attached)

2007-01-25 Thread Jonathan Wright
... The problems bothering me are the measured peak is much wider than the simulation Peak widths should be 400 microns (your beamsize) divided by 3.5 cm (your distance) in radians, which is about 180*0.4/3.5/PI = 6.5 degrees. HTH, Jon

Re: Strange peaks from grainy Si (data re-attached)

2007-01-25 Thread cxc3304
Hi, Miguel, the unit is the so-called moment transfer that is calculated as sin(theta)/lambda. When I did the simulation, I use the Zr K-emission as the first wavelength and the Mo-K-alpha as the second, because the spectrum I measured with an AMTREK spectrometer shows that the Zr line is higher th

Re: Strange peaks from grainy Si (data re-attached)

2007-01-25 Thread gregor
Congwu, I'm getting confused with the units of your diffraction patterns, could you just indicate 2theta which is probably the primary observation without any assumption about lambda? Also, I've trouble with your simulated Si pattern: there should be no traces of Zr radiation generated peaks,