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By irradiation with 1.3 · 10 19  fast neutrous per cm 2  at about 50°C the α ⇄ β ·inversion of pure SiO 2 -Cristobalite is markedly displaced to lower temperatures. The lattice parameters increase. Repeated tempering up to 500°C does not change the irradiated state. Tempering at 1600°C gives full recovery and restores the inversion temperatures before irradiation. — An addition of TiO 2  to pure SiO 2 -Cristobalite produces a Cristobalite with similar inversion temperatures as irradiated Cristobalite. The lattice parameters are also increased.

Eigenschaftsänderungen von SiO 2 -Cristobalit durch Bestrahlung mit schnellen Neutronen und durch Einbau von Fremdatomen