1964
DOI: 10.1107/s0365110x64002523
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X-ray analysis of ferroelectric domains in the paraelectric phase of NaNO2

Abstract: It is well known that a paraelectric phase of NaNO~ crystals exists above 160 °C. Laue patterns with filtered Cu radiation obtained at 185 °C show, besides thermodiffuse spots, diffuse but relatively sharp layer lines orthogonal to the polar axis along l --2, 3, 4. It is shown that they can be explained by ca. 30/~ long small domains with ferroelectric structure (so called "cigarrillos") statistically orientated parallel or antiparallel to the polar axis. This positional disorder with correlations can never ex… Show more

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Cited by 24 publications
(7 citation statements)
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“…1). There are also similarities to the structure of the ferroelectric phase of sodium nitrite, NaNO2 (Canut & Hosemann, 1964) where NO~-groups in parallel planes are stacked along b and the Na + ion is six-coordinated to oxygen forming triangular prisms. In this case, of course, the NOz groups are oriented with their dipole moments parallel.…”
Section: Table 2 Distances (A) and Angles (°) Of Na + Coordination Imentioning
confidence: 80%
“…1). There are also similarities to the structure of the ferroelectric phase of sodium nitrite, NaNO2 (Canut & Hosemann, 1964) where NO~-groups in parallel planes are stacked along b and the Na + ion is six-coordinated to oxygen forming triangular prisms. In this case, of course, the NOz groups are oriented with their dipole moments parallel.…”
Section: Table 2 Distances (A) and Angles (°) Of Na + Coordination Imentioning
confidence: 80%
“…For the infinite crystal it concides with the Patterson function in current use, so that P(r) = lim ~ gav dis(r) = ν* Σ <F (hkl)> 2 e 2 "« hx + * + ">, In performing the convolution square of the real disordered infinite crystal, terms of two different kind are obtained (see also CANUT and HOSEMANN, 1964). A series of terms is due to the selfimages of each molecule, whose average value is proportional to Σ<2(τ) = ZQu(r).…”
Section: Q^^(r) = Qcqn(t)*zci(r)mentioning
confidence: 99%
“…Sharp satellite (1 AE )50 reflections disappear on approaching T N and are replaced by diffuse reflections. Canut & Hosemann (1964) investigated the diffuse scattering of NaNO 2 in the paraelectric phase 20 K above the Curie point and found microdomains of a characteristic shape which they called 'cigarillos'.…”
Section: Introduction and Summary Of Previous Workmentioning
confidence: 99%