SDD Materials : SMD capacitors 0402, 0.5 mm thick, with X7R dielectric

Component Fraction by weight(1) A Z (Z/A) Density
[g/cm3] 		Radiation Length
[cm] 		Radiation Length
[g/cm2]
Ceramic X7R (mainly BaTiO3) 0.788000   93.9907 39.1410 0.41643 5.85 ( a) 1.90824 11.1632
Inner electrodes (mainly Ni) 0.027000   58.6928 28. 0.47706 8.902 1.42 12.68
Terminations (assumed: 25% Cu) 0.046250   63.5460 29. 0.45636 8.960 1.44 12.86
Terminations (assumed: 25% BaO) 0.046250 124.6666 50.9913 0.40902 5.720 ( b) 1.57745 9.02030
Terminations (assumed: 25% Ni) 0.046250   58.6928 28. 0.47706 8.902 1.42 12.68
Terminations (assumed: 25% Sn) 0.046250 118.710 50. 0.42119 7.310 1.21 8.82
SMDcap-0402, X7R   92.5591 38.9062 0.42034 6.15370 ( c) 1.79896 11.0703
(1) The weight fractions are average values for mass % and total mass of the selected thickness of capacitors 0402.

Calculation performed using the method described here .
 
 
 
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