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

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Page 236

The value of c/v for each wave may be called the refractive index n for that wave.

The refractive indices of the two waves, as functions of the direction of their

common

indicatrix.

The value of c/v for each wave may be called the refractive index n for that wave.

The refractive indices of the two waves, as functions of the direction of their

common

**wave normal**, are obtained by drawing an ellipsoid known as theindicatrix.

Page 239

We know that two waves are Optic

for a uniaxial crystal; (a) positive crystal, (6) negative crystal. propagated

outwards from the point source in any direction. The indicatrix construction shows

that ...

We know that two waves are Optic

**Wave normal**I a b Fio. 13.4. The wave surfacefor a uniaxial crystal; (a) positive crystal, (6) negative crystal. propagated

outwards from the point source in any direction. The indicatrix construction shows

that ...

Page 264

The ratio of the radii of the two wave surfaces at right angles to the optic axis is

therefore 1 -553/1-544 = 1 -006. ... Associated with any given

are, just as before, two definite waves that travel through the crystal unchanged in

...

The ratio of the radii of the two wave surfaces at right angles to the optic axis is

therefore 1 -553/1-544 = 1 -006. ... Associated with any given

**wave normal**thereare, just as before, two definite waves that travel through the crystal unchanged in

...

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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