Soft x-ray diffraction of striated muscle
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989
The structures of poly(2-hydroxy-6-naphthoic acid) (PHNA), (C10H6COO)x, at room and high temperatures accompanying the phase transition at ca. 340 have been determined by X-ray powder diffraction analysis. The PHNA data at room temperature can be explained by an orthorhombic cell with a = 7.66 (1) Å, b = 5.98 (1) Å, and c = 17.12 (3) Å, space group Pbc21 (four C10H6COO units, ρcalc = 1.44 g cm−3), and the naphthoic rings staggered by ca. 120° along the chain. Disorder has been considered in the packing by giving equal occupancy to the two molecules oriented up or down along the c cell axis and some degree of molecular mobility along the c axis. The space group Iba2 was found at 370 °C with the cell parameters a = 9.28 Å, b = 5.64 Å, and c = 17.04 Å (four C10H6COO, ρcalc = 1.27 g cm−3). The new structure can be explained starting from the room temperature one by applying a rotational statistical model involving a 2-fold axis around the chain axis, analogous to a smectic E phase. © 1994, American Chemical Society. All rights reserved.
S.F. Fan, W.B. Yun, et al.
Proceedings of SPIE 1989
M. Hargrove, S.W. Crowder, et al.
IEDM 1998
Ellen J. Yoffa, David Adler
Physical Review B
O.F. Schirmer, W. Berlinger, et al.
Solid State Communications