## Physical Properties of Crystals |

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Page 209

In more complicated situations, where there are more than two fluxes and

associated forces, equations (25) are generalized to * = Lu X; (i, j = 1,2,..., n), (27)

and

the j's ...

In more complicated situations, where there are more than two fluxes and

associated forces, equations (25) are generalized to * = Lu X; (i, j = 1,2,..., n), (27)

and

**Onsager's Principle**asserts that Lu = Lost. (28) It is important to notice thatthe j's ...

Page 211

(32)

differentiation being across the crystal boundary. Therefore, (32) still holds in the

vacuum, and hence kai and kis cannot both be zero in the vacuum. (We cannot of

...

(32)

**Onsager's Principle**, equation (31), shows that 6(kai —k 18) - 0, ôrs thedifferentiation being across the crystal boundary. Therefore, (32) still holds in the

vacuum, and hence kai and kis cannot both be zero in the vacuum. (We cannot of

...

Page 214

This relation is now recognized as a special instance of the application of

fluxes ji and forces Xi are associated by the linear equations ji = Lü X; (i, j = 1,2,...,

n), (27) ...

This relation is now recognized as a special instance of the application of

**Onsager's Principle**.**Onsager's Principle**asserts that, if appropriately chosenfluxes ji and forces Xi are associated by the linear equations ji = Lü X; (i, j = 1,2,...,

n), (27) ...

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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