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Polarized Raman spectra are measured for Se species incorporated into one-dimensional channels of AlPO 4 -5 (AFI) single crystal. The optical phonon modes of Se/AFI are observed to be shifted to higher frequencies from that of a trigonal Se crystal, because of the loss of inter-chain interactions in the Se/AFI. Sharp Raman signals show that the Se species is of high crystallinity. By symmetry...
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