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. 2019 May 10;5(5):eaav4119. doi: 10.1126/sciadv.aav4119

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Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — (A) Three main classes, divided from simplified cuboid form. Cuboid, blue; another cuboid, gray; hexahedron with rhombus face, yellow. (B) Filled UPF-1 using four cuboids and a hexahedron in a unit cell. (C) Space-filled UPF-1 in 2 by 2 unit cells from the c axis. (D) Comparison with normalized volume of cuboid (red) and hexahedron (black). The volume of the cuboid is rarely changed, while the hexahedron is largely changed depending on temperature.