Temperature and pressure dependence of the nuclear quadrupole interaction of 23Na in NaClO3

Early, Douglas

doi:10.1063/1.430227

Cited by 8 publications

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“…Since the experiments have indicated that the pressure derivative of frequency is independent of temperature, it can be concluded that A γ = 0; only the static contribution β s γ is significant to the change resulting from the application of a small uniaxial stress. Evidence of this type of behaviour has been reported in other cubic crystals such as NaClO 3 [26] and NaBrO 3 [27]. The parameter β s γ is related to the stress tensor σ and the strain tensor ε, through the expression β d γ =∑ kl Q k S kl (∂σ l /∂P) γ with S kl = (∂ε k /∂σ l ) T .…”

Section: Line Shapesmentioning

confidence: 76%

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K₂OsCl₆: Uniaxial pressure effects

Prado¹,

Armstrong²

1997

Can. J. Phys.

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35 Cl nuclear quadrupole resonance measurements are reported on two single crystal samples of K 2 OsCl 6 subjected to uniaxial pressure. The crystals are cut to allow the stress to be applied in the (100) and (111) directions. Line-shape and spin-lattice relaxation data are obtained over the temperature range 30-57 K spanning the transition temperature for the cubic to tetragonal structural phase transition. Since the line-shapes are well represented by Lorentzians it can be concluded that the source of line broadening is the presence of point defects. The application of pressure causes a shift in the central frequency of the main resonance line in the cubic phase. From the analysis of the results it is concluded that the crystal dynamics are unchanged by the application of a small uniaxial stress; the observed changes are due entirely to variations in the static components of the electric-field gradient. The application of pressure does not affect the frequencies of the lines in the tetragonal phase. The application of pressure in the region of coexistence of the cubic and tetragonal phases enhances the fraction of tetragonal phase present at a particular temperature. The spin-lattice relaxation results are discussed in terms of a Raman two-phonon model. Résumé: Nous avons effectué des mesures de résonance magnétique quadripolaire nucléaire sur le 35 Cl de spécimens de K 2 OsCl 6 soumis à des pressions uniaxiales. Les cristaux sont taillés de façon à pouvoir appliquer la force dans les directions (100) et (111). Nos données portent sur le profil de raie et la relaxation du réseau de spin, sur une plage de température de 30-57 K qui permet de couvrir la transition de phase cubique-tétragonale. Puisque le profil de raie est bien représenté par une lorentzienne, nous concluons que son élargissement est dû aux défauts ponctuels. En phase cubique, la pression cause un déplacement en fréquence de la principale raie de résonance. Notre analyse indique que la dynamique cristalline est insensible à l application de la pression uniaxiale, les changements observés étant dûs entièrement à la variation des composantes statiques du gradient de champ électrique. En phase tétragonale, la pression n a aucun effet sur la fréquence de raie. Dans la région de coexistence des deux phases, une augmentation de pression cause une augmentation de la fraction tétragonale. Nous analysons les résultats sur la relaxation de spin à l aide d un modèle de Raman à deux phonons. [Traduit par la rédaction]

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Section: Line Shapesmentioning

confidence: 76%

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K₂OsCl₆: Uniaxial pressure effects

Prado¹,

Armstrong²

1997

Can. J. Phys.

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K2PtCl4 - ZnTe

Beggerow¹

High-Pressure Properties of Matter

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A1 - L14

Beggerow¹

High-Pressure Properties of Matter

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Temperature and pressure dependence of the nuclear quadrupole interaction of 23Na in NaClO3

Abstract: The data were taken with a spectrometer described by Robinson 6 and modified by Dutcher and Scott. 7 The frequency measurements were conventional. The frequen-

Cited by 8 publications

References 8 publications

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K₂OsCl₆: Uniaxial pressure effects

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K₂OsCl₆: Uniaxial pressure effects

K2PtCl4 - ZnTe

A1 - L14

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Temperature and pressure dependence of the nuclear quadrupole interaction of 23Na in NaClO3

Abstract: The data were taken with a spectrometer described by Robinson 6 and modified by Dutcher and Scott. 7 The frequency measurements were conventional. The frequen-

Cited by 8 publications

References 8 publications

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K2OsCl6: Uniaxial pressure effects

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K2OsCl6: Uniaxial pressure effects

K2PtCl4 - ZnTe

A1 - L14

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About

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K₂OsCl₆: Uniaxial pressure effects

Nuclear quadrupole resonance study of the cubic to tetragonal phase transition in K₂OsCl₆: Uniaxial pressure effects