## Physical Properties of Crystals: Their Representation by Tensors and Matrices |

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Page 121

(iv)

the most convenient one to use in deducing the conditions imposed on the

moduli in all the classes except those belonging to the

(iv)

**Trigonal**and hexagonal systems. The direct inspection method used above isthe most convenient one to use in deducing the conditions imposed on the

moduli in all the classes except those belonging to the

**trigonal**and hexagonal ...Page 281

(vi)

hexagonal: Oz parallel to the 6-fold axis; a = 6 c, ae = /3 = 90°, y = 120°. The

regarded as ...

(vi)

**trigonal**: Oz parallel to the 3-fold axis; a = 6 # c, a = ft = 90°, y = 120°. (vii)hexagonal: Oz parallel to the 6-fold axis; a = 6 c, ae = /3 = 90°, y = 120°. The

**trigonal**and hexagonal systems, having similar sets of axes, are sometimesregarded as ...

Page 282

A rhombohedral unit cell may also be chosen, but usually less advantageously,

in other crystals of the

but in these cases such a unit cell would not be primitive. Choice of axes Ox,, Ox2

, ...

A rhombohedral unit cell may also be chosen, but usually less advantageously,

in other crystals of the

**trigonal**system and in crystals of the hexagonal system,but in these cases such a unit cell would not be primitive. Choice of axes Ox,, Ox2

, ...

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### Contents

THE GROUNDWORK OF CRYSTAL PHYSICS | 3 |

EQUILIBRIUM PROPERTIES | 51 |

ELECTRIC POLARIZATION | 68 |

69 other sections not shown

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### Common terms and phrases

angle anisotropic applied biaxial birefringence centre of symmetry Chapter coefficients conductivity crystal classes crystal properties crystal symmetry cube cubic crystals defined denoted diad axis dijk direction cosines electric field electro-optical effect ellipsoid equal equation example expression follows force given gives heat flow Hence hexagonal indicatrix isothermal isotropic lattice left-handed magnetic magnitude matrix notation measured moduli monoclinic number of independent Onsager's Principle optic axis optical activity orientation permittivity perpendicular photoelastic effect piezoelectric effect plane plate point group positive principal axes produced pyroelectric effect quadric quantities radius vector referred refractive index relation representation quadric represents right-handed rotation scalar second-rank tensor set of axes shear shown shows strain stress suffix notation symbol symmetry elements Table temperature gradient thermal expansion thermodynamics thermoelectric effects Thomson heat tion transformation law trigonal uniaxial unit volume values wave normal wave surface written zero