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X-Ray Studies of Transitions between Nematic, \(Smectic-A_1, -A_2, and -A_d\) Phases
(American Physical Society, 1986)
We report high-resolution x-ray scattering measurements of the critical fluctuations in mixtures of hexylphenyl cyanobenzoyloxy benzoate \((DB_6)\) and terephtal-bis-butylaniline (TBBA). The phase sequence exhibited on ...
X-Ray Studies of Tilted Hexatic Phases in Thin Liquid-Crystal Films
(American Physical Society, 1985)
X-ray-diffraction studies of the structures and phase transitions of the tilted hexatic phases (smectic F and smectic I) in thin liquid-crystal films of 4-n-heptyloxybenzylidene-4-n-heptylaniline (70.7) are reported. The ...
Synchrotron X-Ray Study of Novel Crystalline-B Phases in Heptyloxybenzylidene-Heptylaniline (7O.7)
(American Physical Society, 1982)
This paper reports an x-ray diffraction study of structures and restacking transitions within the B phases of heptyloxybenzylidene-heptylaniline. The system evolves from a hexagonal close-packed structure, through intermediate ...
Absolute Measurement of the Critical Properties of Second Sound at the Smectic-A-to-Nematic Phase Transition in 8OCB
(American Physical Society, 1981)
Light scattered from the driven free surface of the smectic-A phase of octyloxy cyanobiphenyl (8OCB) provides a low-frequency measurement of second sound. This yields an absolute measurement of the smectic elastic constant, ...
Dislocation Model for Restacking Phase Transitions in Crystalline-B Liquid Crystals
(American Physical Society, 1984)
A dislocation-mediated model is presented for restacking phase transitions that have been observed in a variety of lamellar (liquid crystalline) systems. The model explains the existence of nonhexagonal crystalline (smectic)-B ...
Synchrotron Studies of the First-Order Melting Transitions of Hexatic Monolayers and Multilayers in Freely Suspended Liquid-Crystal Films
(American Physical Society, 1989)
Synchrotron x-ray diffraction has been used to study the surface and the interior hexatic-to-liquid (smectic-I to smectic-C) melting transitions of freely suspended liquid-crystal films of N-[4'-(n-heptyl)benzylidene]-4- ...
Synchrotron X-Ray Observation of Surface Smectic-I Hexatic Layers on Smectic-C Liquid-Crystal Films
(American Physical Society, 1987)
Synchrotron x-ray diffraction methods employing a position-sensitive detector were used to study smectic-C (SmC) and smectic-I (SmI) phases in thin (2–6 molecular layers) liquid-crystal films of 4-(n-heptyloxy)benzyliden ...
X-Ray and Optical Studies of the Thickness Dependence of the Phase Diagram of Liquid-Crystal Films
(American Physical Society, 1987)
A comprehensive study of the thickness dependence of the phase diagram of freely suspended films of the liquid crystal 4-n-heptyloxybenzylidene-4-n-heptylaniline (7O.7) between \(50 and 69^{\circ}C\) is reported. In thick ...
X-Ray Scattering Study of Restacking Transitions in the Crystalline-B Phases of Heptyloxybenzylidene Heptylaniline (7O.7)
(American Physical Society, 1985)
This paper reports a comprehensive x-ray diffraction study of the structure and the restacking transitions which occur within the crystalline-B phases of N-[4-(n-heptyl)oxybenzylidene]-4’-(n-heptyl)aniline (7O.7). Between ...
Structural Relaxation of Amorphous \(Pd_{82}Si_{18}\): X-Ray Measurements, Electrical-Resistivity Measurements, and a Comparison Using the Ziman Theory
(American Physical Society, 1985)
Structural relaxation in amorphous \(Pd_{82}Si_{18}\) is studied using high-precision x-ray diffraction. The x-ray structure factor S(k) and the density ρ (determined from the x-ray absorption), are measured simultaneously ...