## Physical Properties of Crystals |

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Page 239

13.2). We know that two waves are axis 10ptic |axis b Fig. 13.4. The

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

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

that ...

13.2). We know that two waves are axis 10ptic |axis b Fig. 13.4. The

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

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

that ...

Page 240

The velocity given by the indicatrix construction is the wave velocity. The

indicatrix construction therefore gives the length of ... Principal sections of the

ria, plane.

The velocity given by the indicatrix construction is the wave velocity. The

indicatrix construction therefore gives the length of ... Principal sections of the

**wave surface**for a biaxial crystal. In the case illustrated the optic axes lie in theria, plane.

Page 263

The

optical activity. The proportional difference between the radii of the two

undistorted surfaces (full curves) at right angles to the optic axis is 6 x 10-". The

radial ...

The

**wave surfaces**of x-quartz (not to scale), showing how they are distorted byoptical activity. The proportional difference between the radii of the two

undistorted surfaces (full curves) at right angles to the optic axis is 6 x 10-". The

radial ...

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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