## Physical Properties of Crystals |

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Page 236

The value of clv 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 clv 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

The wave surface for a uniaxial crystal; (a) positive crystal, (b) negative crystal.

propagated outwards from the point ... It is necessary to distinguish between the

The wave surface for a uniaxial crystal; (a) positive crystal, (b) negative crystal.

propagated outwards from the point ... It is necessary to distinguish between the

**wave normal**and the ray direction, for it is clear from the figure that these two ...Page 265

At the same time we must seek an expression for the ellipticity of the two

unchanged waves as a function of direction. We have to distinguish between the

direction of propagation, that is, the ray direction, and the

separation ...

At the same time we must seek an expression for the ellipticity of the two

unchanged waves as a function of direction. We have to distinguish between the

direction of propagation, that is, the ray direction, and the

**wave normal**. Theseparation ...

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### Contents

THE GROUND WORK OF CRYSTAL PHYSICS | 3 |

Summary | 29 |

EQUILIBRIUM PROPERTIES | 45 |

47 other sections not shown

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### Common terms and phrases

angle anisotropic applied biaxial birefringence centre of symmetry Chapter conductivity constant crystal classes crystal properties crystal symmetry cube cubic crystals defined denoted diad axis dielectric direction cosines displacement elastic compliances electric field electro-optical electro-optical effect ellipsoid equal equation example expression follows forces given gives grad heat flow Hence indicatrix isothermal isotropic magnetic magnitude matrix notation measured moduli Mohr circle monoclinic number of independent Onsager's Principle optic axis optical activity orientation parallel permittivity perpendicular photoelastic effect piezoelectric effect plane plate polarization positive principal axes produced pyroelectric effect quadric radius vector referred refractive index relation representation quadric represents right-handed rotation scalar second-rank tensor shear shown shows strain stress 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