The Crystal Structure of Sodium Nitrite, NaN<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Ziegler, G. E.

doi:10.1103/physrev.38.1040

Cited by 85 publications

(17 citation statements)

References 5 publications

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“…[43][44][45][46][47][48][49][50][51] The ferroelectricity in NaNO 2 was first realized by Sawada et al in 1958;43 then, investigations regarding the origin of its ferroelectricity were extensively carried out in 1960s. [44][45][46][47][48] It has been reported that the ferroelectricity in the low-temperature phase (with a symmetry of Im2m) is attributed to the ordered arrangement of NO 2 groups, [52][53][54] which evolves into a disordered state (with a symmetry of Immm) above the Curie point~160°C. 46 As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Cold Sintering Process: A Novel Technique for Low‐Temperature Ceramic Processing of Ferroelectrics

et al. 2016

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Research on sintering of dense ceramic materials has been very active in the past decades and still keeps gaining in popularity. Although a number of new techniques have been developed, the sintering process is still performed at high temperatures. Very recently we established a novel protocol, the “Cold Sintering Process (CSP)”, to achieve dense ceramic solids at extraordinarily low temperatures of <300°C. A wide variety of chemistries and composites were successfully densified using this technique. In this article, a comprehensive CSP tutorial will be delivered by employing three classic ferroelectric materials (KH2PO4, NaNO2, and BaTiO3) as examples. Together with detailed experimental demonstrations, fundamental mechanisms, as well as the underlying physics from a thermodynamics perspective, are collaboratively outlined. Such an impactful technique opens up a new way for cost‐effective and energy‐saving ceramic processing. We hope that this article will provide a promising route to guide future studies on ultralow temperature ceramic sintering or ceramic materials related integration.

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Section: Resultsmentioning

confidence: 99%

Cold Sintering Process: A Novel Technique for Low‐Temperature Ceramic Processing of Ferroelectrics

et al. 2016

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“…(Im2m) [13,141. The X-ray analysis has assigned to the non-polar disordered paraelectric phase the orthorhombic space group symmetry D;:(Immm) [15] with one formula unit per primitive cell.…”

Section: Crystal Structure and Lattice Vibrationsmentioning

confidence: 99%

Lattice Mode Anharmonicity in Sodium Nitrite

Bréhat¹,

Wyncke²,

Shérif³

1982

Physica Status Solidi (b)

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The snharmonicity of the infrared active lattice modes of sodium nitrite is studied from measurements of the infrared reflectivity from 60 to 400 cm-l, in the temperature range 80 to 460 K. The infrared reflectivity spectra are analysed with the four-parameter dispersion model based on the factorized form of the dielectric fnnction. The comparison between the results of the quantum theory and the dependence observed of damping shows that cubic anharmonicity drives the lattice dynamics of sodium nitrite when the crystal structure is ordered, and that disorder occurs below the phase transition temperature. The results confirm the breakdown of the selection rules in the paraelectric phase and suggest the existence of dielectric dispersion in the low frequency region.Sous avons Btudib I'anharmonicit8 des modes de rBseaux actifs en infrarouge dans le nitrite de sodium, .?t partir de l'evolution du facteur de reflexion de 60 B 400 cm-' pour des temperatures comprises entre SO et 460 K. La comparaison entre les rksultnts de la th6orie quantique e t l'bvolution de 1' 1 fonction amortissement avcc la temperature montre que l'anharmonicite cubique regit la dynamiqiie dii r6seeu du nitrite de sodium quand la structure cristalline est ordonnhe, e t que le dbsordre apparait dans le cristal en dessous de la temperature de transition de phase. Lesr6sultats confirrnent In d6faillnnce des r&gles de sblection dans la phase parablectrique et sugghrent l'existence de dispersion diblectriqne dam les basses frbquenccs.

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“…I n the ferroelectric phase stable below 163 "C sodium nitrite is orthorhombic, space group Ci:(Im2m), with one formula unit per primitive cell [13]. The NO; group lies in the bc crystal plane of the unit cell (twice the primitive one) with the symmetry axis parallel to the b-direction.…”

Section: Resultsmentioning

confidence: 99%

Angular dispersion of the internal phonon modes in ferroelectric sodium nitrite

Castellucci¹,

Schettino²

1979

Physica Status Solidi (b)

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The angular dispersion of the frequencies of the internal modes in ferroelectric sodium nitrite are determined by measuring the Raman spectra with observation of phonon propagating in the ab, ac and bc crystallographic planes. Using the exciton model and a resonant dipole-dipole interaction mechanism the angular dispersion is calculated resulting in good agreement with the experiment. The k dispersion curves are also calculated for points along the [loo], [OlO], and [OOlj directions.Nous avons Btudik la dispersion angulaire des frequences des phonons internes d'un cristal ferroelectric de NaNO? au moyen de I'analyse des spectres de diffusion Raman. Les spectres que nous avons obtenu correspondent it la propagation des phonons dans le plans cristallographiques ab, ac et bc. L'emploi d'un model d'excitons molbculaires e t de interaction dipole-dipole nous a permis de calculer les curbcs de dispersion angulaire. L'accord entre les valeurs calculkes et le donnbes experirnentaux est excellente. Nous avons calculb aussi les curbes de dispersion des vecteura d'onde k selon les directions [loo], [OlO] et [OOl]. l) Via G. Capponi 9,

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The Crystal Structure of Sodium Nitrite, NaNO2

Cited by 85 publications

References 5 publications

Cold Sintering Process: A Novel Technique for Low‐Temperature Ceramic Processing of Ferroelectrics

Cold Sintering Process: A Novel Technique for Low‐Temperature Ceramic Processing of Ferroelectrics

Lattice Mode Anharmonicity in Sodium Nitrite

Angular dispersion of the internal phonon modes in ferroelectric sodium nitrite

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