1998
DOI: 10.1103/physrevb.57.13589
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Raman study of the ferroelastic phase transition inK3Na(SeO

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Cited by 21 publications
(14 citation statements)
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“…Then, the space group is considered to be P3 or P3. This result is in agreement with the study from the Raman scattering [7]. In the preliminary structure analysis with an isotropic thermal parameter, the discrepancy factors (R factors) calculated for the above space groups are reduced to about 0.07.…”
Section: Resultssupporting
confidence: 79%
See 1 more Smart Citation
“…Then, the space group is considered to be P3 or P3. This result is in agreement with the study from the Raman scattering [7]. In the preliminary structure analysis with an isotropic thermal parameter, the discrepancy factors (R factors) calculated for the above space groups are reduced to about 0.07.…”
Section: Resultssupporting
confidence: 79%
“…The ferroelastic character of the relevant transition is concluded from the observation of domain structure in the polarized light and the domains which are reorientable under the external force are clearly observed below 334 Κ [6]. Recently, the symmetry of the sample crystal in the intermediate phase (334-346 K) has been determined to be trigonal with the point group in the Raman scattering measurements [7].…”
Section: Introductionmentioning
confidence: 99%
“…A correlation between phase transition temperatures and the deformation of the tetrahedral anions, reported in Ref. [5] predicted of a similar phase transition for KNS to take place at about 75±25 K. To obtain more information on this phase transition, reported in Ref. [6] and to check a possibility of existence of an incommensurate phase, the KNS crystals were subjected to dielectric measurements, Brillouin light scattering and composite oscillators study in a wide temperature range from 18 K to 300 K. Some critical phenomena in the vicinity of 70 K and additionally at about 50 K observed in the study will be discussed elsewhere.…”
Section: Introductionmentioning
confidence: 94%
“…Macroscopic measurements such as low-frequency dielectric, adiabatic calorimetry, thermal expansion and linear birefringence ones detect the anomaly at 346 K [2,9], while techniques such as Raman [10] and Brillouin [11] scattering methods detect it at 344 K. The phase transition at 346 K is of the second-order (continuous) type, while the phase transition at 334 K is of the first-order (discontinuous) type. The ferroelastic phase transition in KNSe is classified as an improper one.…”
Section: Introductionmentioning
confidence: 98%