Difference between revisions of "11BM Calibration Sample: Lattice & Atomic Position Values"

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Calibration of the wavelength at 11-BM is performed using a mixture of NIST standard reference materials (SRMs). As of 2011, the calibration sample is a mixture of ~ 70 wt% Si (SRM 640c) and ~ 30 wt% Al2O3 (SRM 676).
Calibration of the wavelength at 11-BM is performed using a mixture of NIST standard reference materials (SRMs).
 
As of 2011, the calibration sample is a mixture of ~ 70 wt% Si (SRM 640d) and ~ 30 wt% Al2O3 (SRM 676).


Lattice & Atomic Position Values are as follows:
Lattice & Atomic Position Values are as follows:


  Si (SRM 640c)
  Si (SRM 640d)
  lattice
  Space Group: F d -3 m
  a =
  Lattice: 5.431590 5.431590 5.431590 90.0000 90.0000 90.0000
 
Atom1: Si @ x = 1/8, y = 1/8, z = 1/8
atom    x      y      z
  Si
 
 
  Wt. Frac.:    0.29019
a
x         y     z
Si 0.125000  0.125000  0.125000
 
 


Wt. Frac.:    0.70981 


a        b        c    
Al2O3 (SRM 676a)
4.759728  4.759728 12.993473
Space Group: R -3 c
Lattice: 4.7590914 4.7590914 12.991779  90.0000 90.0000 120.0000
Atom1: Al @ x = 0, y = 0, z = 0.351869
Atom2: O @ x = 0.307804, y = 0, z = 1/4


x         y     z  
As of 13 February 2013, we started using the revised certification for 640d,
Al 0.000000  0.000000 0.352011
for which the parameters are
O 0.306702  0.000000 0.250000
Si (SRM 640d)
  Space Group: F d -3 m
Lattice: 5.431230 5.431230 5.431230 90.0000 90.0000 90.0000
  Atom1: Si @ x = 1/8, y = 1/8, z = 1/8

Latest revision as of 22:46, 14 February 2013

Calibration of the wavelength at 11-BM is performed using a mixture of NIST standard reference materials (SRMs).

As of 2011, the calibration sample is a mixture of ~ 70 wt% Si (SRM 640d) and ~ 30 wt% Al2O3 (SRM 676).

Lattice & Atomic Position Values are as follows: 

Si (SRM 640d)
Space Group: F d -3 m
Lattice: 5.431590 5.431590 5.431590  90.0000 90.0000 90.0000
Atom1: Si @ x = 1/8, y = 1/8, z = 1/8



Al2O3 (SRM 676a)
Space Group: R -3 c
Lattice: 4.7590914 4.7590914 12.991779  90.0000 90.0000 120.0000
Atom1: Al @ x = 0, y = 0, z = 0.351869
Atom2: O @ x = 0.307804, y = 0, z = 1/4

As of 13 February 2013, we started using the revised certification for 640d, for which the parameters are 

Si (SRM 640d)
Space Group: F d -3 m
Lattice: 5.431230 5.431230 5.431230  90.0000 90.0000 90.0000
Atom1: Si @ x = 1/8, y = 1/8, z = 1/8
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