Journal ArticleDOI
The phase transition of two-dimensional squaric acid H2C4O4 studied by neutron scattering
Emil J. Samuelsen,Dag Semmingsen +1 more
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In this article, it was concluded that proton disorder is not the dominant source of diffuse scattering in squaric acid at Tc = 370 K and the phase transition is essentially two-dimensional with β = 0.137 ± 0.010.About:
This article is published in Journal of Physics and Chemistry of Solids.The article was published on 1977-01-01. It has received 57 citations till now. The article focuses on the topics: Small-angle neutron scattering & Neutron scattering.read more
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A Supramolecular Ferroelectric Realized by Collective Proton Transfer
Journal ArticleDOI
Hydrogen-bonded donor–acceptor compounds for organic ferroelectric materials
TL;DR: Ferroelectricity and a significant dielectric response, as well as an antiferroelectric ordering induced by proton transfer, are demonstrated in the hydrogen-bonded chains composed of 2,5-dihydroxy-p-benzoquinone derivatives and nitrogen-containing aromatic bases.
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Effects of pressure on the dielectric properties and phase transitions of the 2‐D antiferroelectric squaric acid: (H2C4O4 and D2C4O4)
G. A. Samara,Dag Semmingsen +1 more
TL;DR: In this article, pressure dependences of the dielectric properties and phase transitions of squaric acid, H2C4O4 and its deuterated analog, D2C 4O4, were investigated.
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Temperature dependence of the order parameter of the two dimensional antiferroelectric squaric acid as determined from birefringence measurements
W. Kuhn,H.D. Maier,J. Petersson +2 more
TL;DR: In this paper, the temperature dependence of the partial birefringence Δ n is measured on single crystals of squaric acid and a phase transition of the first order is detected.
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On the temperature dependence of the hydrogen bond order in squaric acid: neutron diffraction studies at four different temperatures1
TL;DR: The crystal structure of squaric acid [3,4-dihydroxy-3-cyclobutene-1,2-dione, H 2 C 4 O 4, M = 114.1] has been determined from neutron diffraction data at 15 K, T c - 21K, Tc - 13 K and T c + 5 K below and above the phase transition at 374 K as discussed by the authors.
References
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Experiments on simple magnetic model systems
L.J. de Jongh,A.R. Miedema +1 more
TL;DR: In this article, a review of the theoretical and experimental results obtained on simple magnetic model systems on magnetic lattices of dimensionality 1, 2, and 3 is presented, with particular attention paid to the approximation of these model systems in real crystals, viz how they can be realized or be expected to exist in nature.
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The renormalization group in the theory of critical behavior
TL;DR: In this paper, the renormalization group approach to the theory of critical behavior is reviewed at an introductory level with emphasis on magnetic systems, including the dependence of critical exponents above Tc on dimensionality d = 4−e.
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Theory of Critical-Point Scattering and Correlations. I. The Ising Model
TL;DR: The theory of the correlations and critical scattering of two-dimensional nearest-neighbor Ising models is discussed in this paper, where a distinction is drawn between the true inverse range of exponential decay of correlations, and the effective range determined from the low-angle scattering intensity.
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Paromomycin. i. paromamine, a glycoside of d-glucosamine1
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A structural phase transition in squaric acid
Dag Semmingsen,Jens Feder +1 more
TL;DR: In this article, a second order antiferrodistortive tetragonal to monoclinic phase transition at 97.7°C was found for 3,4-dihydroxy-3-cyclobutene-1,2-dione.