PbF2-based single crystals and phase diagrams of PbF2-MF2 systems (M = Mg, Ca, Sr, Ba, Cd)

I. I. Buchinskaya; Pavel P. Fedorov; B. P. Sobolev

doi:10.1117/12.280705

14 July 1997 PbF2-based single crystals and phase diagrams of PbF2-MF2 systems (M = Mg, Ca, Sr, Ba, Cd)

I. I. Buchinskaya, Pavel P. Fedorov, B. P. Sobolev

Proceedings Volume 3178, Solid State Crystals: Growth and Characterization; (1997) https://doi.org/10.1117/12.280705
Event: XII Conference on Solid State Crystals: Materials Science and Applications, 1996, Zakopane, Poland

Abstract

Optical grade single crystals of Pb_0.67Cd_0.33F₂ and Pb_1-xCa_xF₂ (x less than 0.05) were grown by the Bridgman technique in graphite crucibles under fluorinating atmosphere of teflon pyrolysis products. For determinations of concentration areas of solid solutions, suitable for crystal growth, the phase interactions in the systems PbF₂ with fluorides of alkaline-earth elements and Cd were studied by DTA and x-ray powder diffraction techniques. Phase diagrams were described by corresponding thermodynamic models. Transition from pure PbF₂ to two- component Pb_0.67Cd_0.33F₂ crystal is accompanied by some increase in radiation hardness of the latter and positive changes of mechanical characteristics (the Pb_0.67Cd_0.33F₂ composition microhardness is 147 plus or minus 5 kg/mm² that is 5 times that of a pure lead fluoride, 28 plus or minus 4 kg/mm²). These solid solutions have a cubic Fm3m fluorite-type lattice as a high-temperature modification of PbF₂.

Citation Download Citation

I. I. Buchinskaya, Pavel P. Fedorov, and B. P. Sobolev "PbF2-based single crystals and phase diagrams of PbF2-MF2 systems (M = Mg, Ca, Sr, Ba, Cd)", Proc. SPIE 3178, Solid State Crystals: Growth and Characterization, (14 July 1997); https://doi.org/10.1117/12.280705

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