## Physical Properties of Crystals |

### From inside the book

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Page 20

The effect of

discussion of second-rank tensor properties for a while and broaden our outlook

to include all crystal properties. We have to examine the question of how the

symmetry ...

The effect of

**crystal symmetry**on crystal properties We must now leave ourdiscussion of second-rank tensor properties for a while and broaden our outlook

to include all crystal properties. We have to examine the question of how the

symmetry ...

Page 22

But Neumann's Principle states that the symmetry of the property depends on the

point group. Therefore Neumann's Principle does not apply to X-ray diffraction.

5.1. The effect of

But Neumann's Principle states that the symmetry of the property depends on the

point group. Therefore Neumann's Principle does not apply to X-ray diffraction.

5.1. The effect of

**crystal symmetry**on second-rank tensor properties.Page 321

effect on properties, general principles, 20–24, 245; see also under individual

properties and 293–301.

proofs of ...

**Symmetry**of a physical property, definition, 21.**Symmetry**of**crystals**, 276–88.effect on properties, general principles, 20–24, 245; see also under individual

properties and 293–301.

**Symmetry**of tensor, definition for secondrank, 15.proofs of ...

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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