Hi. This is a case of radians - we have to change degrees into radians.
And we get good results, but only for some substances (and always for
cubic, orthorhombic and tetragonal ones).
Regards,
Luke K.
> Hi
>
> Just a general warning about using Excel with trigonometric functions:
> =sin(0) give
Hi Ron and all,
I realize that I'm not the only one who'd like to use the Gandolfi technique
without the need to
make one's own photographic films.
In principle there are various ways to solve the problem.
One would be to mount a Gandolfi attachment on a 4-circle goniometer equipped
with a CCD
Hi
Just a general warning about using Excel with trigonometric functions:
=sin(0) gives 0
=sin(90) gives 0.893997
=sin(180) gives -0.80115
In other words, I haven't gotten sine and cosine to work reliably with
Excel. It might be a good idea to check the calculations using some
other software,
Ok - sorry, changed degrees into radians. But there is still a difference
for sulphur in aluminite.
Best regards,
Luke K.
> OK, here it goes:
>
> Uiso = 1/3 * [U22 + 1/sin^2(beta)*(U11 + U33 + 2U13cos(beta)] =
> 1/3 * [0.01562 + (1/sin^2(110.18))*(0.01937 + 0.01277 + 2*
> (-0.00027)*cos(110.18)
OK, here it goes:
Uiso = 1/3 * [U22 + 1/sin^2(beta)*(U11 + U33 + 2U13cos(beta)] =
1/3 * [0.01562 + (1/sin^2(110.18))*(0.01937 + 0.01277 + 2*
(-0.00027)*cos(110.18)] =
1/3 * [0.01562 + (1/(0.9386)^2) * (0.03214 + (-0.00054)*(-0.345)] =
1/3 * [0.01562 + (1/0.88097) * 0.0323263] =
1/3 * [0.01562 + 1.
