Low-temperature structural phase transition in synthetic libethenite Cu2PO4OH |
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| Authors: | Alexei A. Belik Pan?e Naumov Jungeun Kim Shunsuke Tsuda |
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| Affiliation: | aInternational Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan;bDepartment of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan;cJapan Synchroron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo-cho, Hyogo 679-5198, Japan;dSuperconducting Properties Unit, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan |
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| Abstract: | Low-temperature structural properties of the synthetic mineral libethenite Cu2PO4OH were investigated by single-crystal X-ray diffraction, synchrotron X-ray powder diffraction, specific heat measurements, and Raman spectroscopy. A second-order structural phase transition from the Pnnm symmetry (a=8.0553(8) Å, b=8.3750(9) Å, c=5.8818(6) Å at 180 K) to the P21/n symmetry (a=8.0545(8) Å, b=8.3622(9) Å, c=5.8755(6) Å, β=90.0012(15) at 120 K) was found at 160 K during cooling. At 120 K, the monoclinic angle is 90.0012(15) from single crystal X-ray data vs 90.083(1) from powder X-ray diffraction data. The P21/n–to–Pnnm transition may be a general feature of the adamite-type compounds, M2XO4OH. |
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| Keywords: | Adamite family Mineral libethenite Crystal structure Single crystal Specific heat |
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