Structural instability of PbSe/SnSe superlattices under pressure |
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Authors: | Y Ohishi N Shingaki Y Fujii Z Hiroi N Nakayama Y Bando |
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Institution: | 1. Fac. Eng. Sci. , Osaka Univ. , Toyonaka, Osaka, 560, Japan;2. Sumitomo Chem. Co., Ltd. , Tsukuba Res. Lab. , Tsukuba, Ibaraki, 300–32, Japan;3. Fac. Eng. Sci. , Osaka Univ. , Toyonaka, Osaka, 560, Japan;4. Inst. Mater. Sci. , Univ. Tsukuba , Tsukuba, Ibaraki, 305, Japan;5. Inst. Chem. Res. , Kyoto Univ. , Uji, Kyoto, 611, Japan |
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Abstract: | Abstract PbSe/SnSe superlattice, phase transition, high pressure, SR x-ray diffraction) Synchrotron x-ray diffraction experiments have revealed successive phase transitions in epitaxially-grown PbSe/SnSe superlattices. The transition pressures from the low-pressre cubic B1- to the high-pressure orthorhombic B16-type structures are observed to vary systematically depending upon thickness of the PbSe layer. For example, a PbSe(36A)/SnSe(12A)]19, with the B1 structure in both layers stabilized in its asgrown state, undergoes the B1/B1]-to-B1/B16] and B1/B16]-to-B16/B16] structural transitions at 1.9 and 3.8GPa, respectively. This result is in contrast to their bulk data that the B1-to-B16 transition takes place at 5.3GPa in PbSe while the B16 phase is stable in SnSe at atmospheric pressure. |
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Keywords: | Polymerization Benzene Thiophene Pressure |
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