## Physical Properties of Crystals |

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Page 20

It may be stated as follows: The

crystal must include the

point group of a crystal is the group of macroscopic

It may be stated as follows: The

**symmetry elements**of any physical property of acrystal must include the

**symmetry elements**of the point group of the crystal. Thepoint group of a crystal is the group of macroscopic

**symmetry elements**that its ...Page 21

Now suppose we wish to know whether a property has a certain

we operate with the potential

investigate ...

Now suppose we wish to know whether a property has a certain

**symmetry****element**or not. First we measure the property relative to some fixed axes. Thenwe operate with the potential

**symmetry element**on the crystal,f and againinvestigate ...

Page 278

denote mirror planes or planes of symmetry perpendicular to the plane of the

paper. The patterns on the two sides of a plane of symmetry are related as the

object and its image in a plane mirror. A list of

...

denote mirror planes or planes of symmetry perpendicular to the plane of the

paper. The patterns on the two sides of a plane of symmetry are related as the

object and its image in a plane mirror. A list of

**symmetry elements**into which the...

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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