## Physical Properties of Crystals |

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Page 90

(ii)

its edges. The Mohr circle for a state of

(ii)

**Biaxial**stress. or 0 01. 0 as 0 0 0 0 An example of a non-uniform distribution of**biaxial**stress is the stress in a thin plate loaded by forces and couples applied toits edges. The Mohr circle for a state of

**biaxial**stress is shown in Fig. 5.9.Page 238

These two FIG. 13.3. The two circular sections of the indicatrix, and the two

primary optic axes OP1, OPs, for a

the principal axis of the indicatrix that is intermediate in length between the other

two.

These two FIG. 13.3. The two circular sections of the indicatrix, and the two

primary optic axes OP1, OPs, for a

**biaxial**crystal. Both circular sections containthe principal axis of the indicatrix that is intermediate in length between the other

two.

Page 240

Principal sections of the wave surface for a

the optic axes lie in the ria, plane. For lettering see Fig. 13.7. piece of analytical

geometry, which we shall omit here, to show that the extraordinary wave surface

is ...

Principal sections of the wave surface for a

**biaxial**crystal. In the case illustratedthe optic axes lie in the ria, plane. For lettering see Fig. 13.7. piece of analytical

geometry, which we shall omit here, to show that the extraordinary wave surface

is ...

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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