## Physical Properties of Crystals: Their Representation by Tensors and Matrices |

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Page 246

Hence, the optical properties of the crystal in the field will be those appropriate to

the trigonal class 3, which is

stress applied parallel to a 3-, 4- or 6-fold axis will give an optically

crystal ...

Hence, the optical properties of the crystal in the field will be those appropriate to

the trigonal class 3, which is

**uniaxial**. We can immediately see that a**uniaxial**stress applied parallel to a 3-, 4- or 6-fold axis will give an optically

**uniaxial**crystal ...

Page 252

Hence, in this case, An2 = An3 and the crystal is

31), (32) the birefringence for light travelling along x2 is evidently n„— nx = An1—

An3 = — $(»0)3(7rn— (33) and, for light travelling along x3, nu— n± - An1— ...

Hence, in this case, An2 = An3 and the crystal is

**uniaxial**. From equations (30), (31), (32) the birefringence for light travelling along x2 is evidently n„— nx = An1—

An3 = — $(»0)3(7rn— (33) and, for light travelling along x3, nu— n± - An1— ...

Page 253

Formulae (33) and (34) refer to a cubic crystal under

cube axis. They give the birefringences along the other two cube axes. In Table

16 we include the corresponding results for some other conditions of stressing ...

Formulae (33) and (34) refer to a cubic crystal under

**uniaxial**tension parallel to acube axis. They give the birefringences along the other two cube axes. In Table

16 we include the corresponding results for some other conditions of stressing ...

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### Contents

THE GROUNDWORK OF CRYSTAL PHYSICS | 3 |

EQUILIBRIUM PROPERTIES | 51 |

ELECTRIC POLARIZATION | 68 |

69 other sections not shown

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### Common terms and phrases

angle anisotropic applied biaxial birefringence centre of symmetry Chapter coefficients conductivity crystal classes crystal properties crystal symmetry cube cubic crystals defined denoted diad axis dijk direction cosines electric field electro-optical effect ellipsoid equal equation example expression follows force given gives heat flow Hence hexagonal indicatrix isothermal isotropic lattice left-handed magnetic magnitude matrix notation measured moduli monoclinic number of independent Onsager's Principle optic axis optical activity orientation permittivity perpendicular photoelastic effect piezoelectric effect plane plate point group positive principal axes produced pyroelectric effect quadric quantities radius vector referred refractive index relation representation quadric represents right-handed rotation scalar second-rank tensor set of axes shear shown shows strain stress suffix notation symbol 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