International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

© International Union of Crystallography 2006
International Tables for Crystallography (2006). Vol. C. ch. 4.4, p. 433

Table 4.4.2.1 

I. S. Andersona and O. Schärpff

Table 4.4.2.1 | top | pdf |
Some important properties of materials used for neutron monochromator crystals (in order of increasing unit-cell volume)

Material Structure Lattice constant(s) at 300 K
a, c (Å) 		Unit-cell volume
V0 (10−24 cm3) 		Coherent scattering length
b (10−12 cm) 		Square of scattering-length density
(10−21cm−4) 		Ratio of incoherent to total scattering cross section
σinc/σs 		Absorption cross section
σabs (barns)† (at λ = 1.8 Å) 		Atomic mass A Debye temperature
[\theta_D] (K) 		[A\theta^2_D] (106  K2)
Beryllium h.c.p. a : 2.2856
c : 3.5832 		16.2 0.779 (1) 9.25 [6.5\times10^{-4}] 0.0076 (8) 9.013 1188 12.7
Iron b.c.c. a : 2.8664 23.5 0.954 (6) 6.59 0.033 2.56 (3) 55.85 411 9.4
Zinc h.c.p. a : 2.6649
c : 4.9468 		30.4 0.5680 (5) 1.50 0.019 1.11 (2) 65.38 253 4.2
Pyrolytic graphite layer hexag. a : 2.461
c : 6.708 		35.2 0.66484 (13) 5.71 [>2\times10^{-4}] 0.00350 (7) 12.01 800 7.7
Niobium b.c.c. 3.3006 35.9 0.7054 (3) 1.54 [4\times10^{-4}] 1.15 (5) 92.91 284 7.5
Nickel (58Ni) f.c.c. 3.5241 43.8 1.44 (1) 17.3 0 4.6 (3) 58.71 417 9.9
Copper f.c.c. 3.6147 47.2 0.7718 (4) 4.28 0.065 3.78 (2) 63.54 307 6.0
Aluminium f.c.c. 4.0495 66.4 0.3449 (5) 0.43 [5.6\times10^{-3}] 0.231 (3) 26.98 402 4.4
Lead f.c.c. 4.9502 121 0.94003 (14) 0.97 [2.7\times10^{-4}] 0.171 (2) 207.21 87 1.6
Silicon diamond 5.4309 160 0.41491 (10) 0.43 [6.9\times10^{-3}] 0.171 (3) 28.09 543 8.3
Germanium diamond 5.6575 181 0.81929 (7) 1.31 0.020 2.3 (2) 72.60 290 6.1
†1 barn = 10−28 m2.