Phase transitions in RbCaF3. I: Optical studies |
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Authors: | JB Bates RW Major FA Modine |
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Institution: | Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, U.S.A. |
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Abstract: | Phase transitions in RbCaF3 have been investigated by optical birefringence measurements and Raman scattering experiments. A near discontinuity in the onset of spontaneous birefringence at 196 K shows that the cubic to tetragonal phase change is “slightly” first order. The Raman spectra of the tetragonal phase support a D184h structure in which two phonons of A1g and Eg symmetry soften as the 196 K transition is approached from lower temperatures. A very slow transition to a lower symmetry structure was observed at about 42 K in the Raman measurements. |
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