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The optical properties of some inorganic fluoride and chloride ...

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- 2 -<br />

OPTICAL PROPERTIES<br />

Beryllium lead <strong>fluoride</strong>, BeF2*PbF2<br />

Biaxial - 2V = 70°<br />

a = 1.602 7 = 1.627<br />

Colorless<br />

Cesium uranium <strong>fluoride</strong>, CsF*UFl(.<br />

Biaxial + 2V = 1*5°<br />

a = 1.553 7 = 1.560<br />

Polysynthetic twinning, X A c = 10°<br />

Z = sky blue<br />

X = greenish blue<br />

Cesium uranium <strong>fluoride</strong>, 2 CsF'UF^<br />

Biaxial +<br />

a = 1.516<br />

Z = light blue<br />

2V = ^5°<br />

7 - 1.52^<br />

X = light greenish blue<br />

Cesium zirconium <strong>fluoride</strong>, CsF-ZrFlj.<br />

Biaxial -<br />

a • iXG*<br />

Colorless<br />

Cesium zirconium <strong>fluoride</strong>, 2 CsF'ZrFl).<br />

2V = 20° - 1*5°<br />

7 = I.V76<br />

(varies)<br />

Uniaxial -<br />

0 = 1.W2<br />

Colorless<br />

Iron <strong>fluoride</strong>, FeF2<br />

Uniaxial +<br />

0 = 1.52k<br />

Brown<br />

Lead uranium <strong>fluoride</strong>, FbF2°UFl|.<br />

E = 1.14-60<br />

E = 1.5^0<br />

Uniaxial -<br />

0 = 1.750<br />

Green<br />

E = 1.730

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