Index 423
point group symbols for 103
stereographic projections of 299–302,
300, 302
cubic (Bravais) lattices 85–6, 85, 86
geometrical relationships between 86, 86
reciprocal lattices of 157, 157
space-filling polyhedra for 90
cubic space groups 119–120
cultures (relationship to symmetry and patterns)
65, 66
cyclosilicates 39, 40
‘Daedalus’ (D.E.H. Jones) 48, 52
Debye, Peter Joseph William 243, 357
Debye-Scherrer X-ray diffraction
powder method 249–52, 251, 252
deoxyribonucleic acid (DNA)
effect of humidity on structure 121
space group for 267, 267
structure simulation by light diffraction
of 262–7, 263, 264, 265, 266
X-ray photograph of xv
diad (two-fold) axis of symmetry 56, 75, 76,99
diamond (rectangular centred) lattice 62,63
diamond
bonding in 27
space group for 120
structures of 47, 48
diffraction and interference 173–4
diffraction contrast (in the electron microscope)
291–2, 291
diffraction grating
image of 329–32, 330, 331, 332
with a limited number of slits 180, 182
with narrow slits 175–7, 175, 177
with wide slits 178–9, 177
diffraction grating and Fourier analysis 323–8,
324, 325, 327, 328, 330
diffraction grating equation 176, 179–80, 326–7
grating term 327
relationship to Bragg’s law 187–8, 187
single aperture term 327
diffractometer X-ray powder method see X-ray
diffractometer
Diffraktionsplatte 329
diopside 318
electron density map of 319
direction (zone axis) symbols 132–3
Dirichlet domains see Voronoi polyhedra
dislocations 25
imaging of in the electron microscope 291, 291
disordered crystals 234
displacive phase transformations
in barium titanate 33
in deoxyribonucleic acid (DNA) 121
in
silica 43
dog-tooth
spar (calcite) 3, 3
domain boundaries (long-range order) 234
domains (in barium titanate) 32, 32
double diffraction
and ‘unindexable’ electron diffraction patterns,
399, 399
effect on systematically absent reflections 396
in electron diffraction patterns of the hcp metal
structure 396, 398, 399, 399n
in electron diffraction patterns of twin-related
crystals 399–400, 400
origin of 396
Double Helix, The 204, 356
duality (in polyhedra) 339–40, 344
dynamical theory
in electron diffraction 273
in X-ray diffraction 205, 206
elastic scattering processes 274, 283, 287
electron backscattered diffraction (EBSD)
patterns 287–8, 290
electron density 315, 318, 319, 320, 322
electron diffraction
comparison with light and X-ray diffraction 165
Ewald reflecting sphere construction for 274–6,
275
electron diffraction patterns 276–7, 276
analysis of 277–8, 278, 279
electron diffraction techniques
identification of polycrystalline
specimens 281–2, 282
identification of quasiperiodic crystals 282–3,
283
orientation relationships between
crystals 280–1, 280
electron scattering amplitude (f
e
) 273
Elements of Euclid 244–5
relation to X-ray focusing geometry 245–6, 245
embrittlement (in iron and steel) 4
enantiomorphism
in α and β quartz structures 44, 44
enantiomorphous crystal structures 43, 106, 107
enantiomorphous screw axes of symmetry 109,
110
enantiomorphous point groups 120
in cubic system 337
in orthorhombic system 337
table of 91
enantiomorphous space groups 118, 120
equal area projection 314n
Escher, M.C. 72, 81, 82
Euler’s formula (for complex numbers) 390–1, 391
Ewald, Paul Peter 193, 357–8
Ewald reflecting sphere construction
and broadening of diffracted beams 217–9, 218
derivation of 198–202, 199, 200
and electron diffraction 274–6, 275
and Laue technique 201, 201
for monoclinic crystal 200, 200, 201
and oscillation method 223–4, 224
for planes deviating from Bragg angle 284–6,
285, 286