## Physical Properties of Crystals |

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Page 17

quadric (26) is referred to them as axes, its equation takes the simpler form Siao-

HS, ...

**Principal axes**. An important property of a quadric is the possession of**principal****axes**. These are three directions at right angles such that, when the generalquadric (26) is referred to them as axes, its equation takes the simpler form Siao-

HS, ...

Page 19

[In a symmetrical tensor referred to arbitrary axes the number of independent

components is six. If the tensor is referred to its

independent components is reduced to three; the number of “degrees of freedom'

is ...

[In a symmetrical tensor referred to arbitrary axes the number of independent

components is six. If the tensor is referred to its

**principal axes**, the number ofindependent components is reduced to three; the number of “degrees of freedom'

is ...

Page 46

In practice one often has to apply the construction to cases where the labelling of

the

suggested. Choose the greater of the two

In practice one often has to apply the construction to cases where the labelling of

the

**axes**does not correspond to this scheme. The following general procedure issuggested. Choose the greater of the two

**principal**components that are ...### What people are saying - Write a review

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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