## Physical Properties of Crystals |

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Page 24

(iv)

quadric parallel to the crystallographic diad axis, and we notice that, when this is

done, the quadric has all the symmetry elements that are found in the classes of ...

(iv)

**Monoclinic**system. Here we must arrange one of the diad axes of the generalquadric parallel to the crystallographic diad axis, and we notice that, when this is

done, the quadric has all the symmetry elements that are found in the classes of ...

Page 109

A

63, c = 13.23 Å, 8 = 134°48'. X-ray measurements of the coefficients of thermal

expansion normal to certain planes hol gave the following results: } 0 l co h 0 l cy

4 0 ...

A

**monoclinic**crystal (afwillite) has the following cell dimensions: a = 16:21, = 5-63, c = 13.23 Å, 8 = 134°48'. X-ray measurements of the coefficients of thermal

expansion normal to certain planes hol gave the following results: } 0 l co h 0 l cy

4 0 ...

Page 283

The most important of these is:

by a number of authors. Optically isotropic, uniaxial and biaxial crystals. The

crystal systems are sometimes grouped into three categories on an optical basis.

The most important of these is:

**monoclinic**: Ora ||Oy, a choice which is followedby a number of authors. Optically isotropic, uniaxial and biaxial crystals. The

crystal systems are sometimes grouped into three categories on an optical basis.

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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