1993
DOI: 10.1002/pssa.2211350221
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Structural Phase Transitions in K3Na(SeO4)2 Crystals

Abstract: Thermal, dielectric, and elastic properties of K3Na(SeO4)2 crystals grown from aqueous solution are studied versus temperature. Two improper structural phase transitions are observed, on cooling, in the temperature range from 300 to 400 K: the nonferroic continuous phase transition with no change of 3m point group at 346 K, and the ferroelastic discontinuous phase transition from the trigonal point group 3m to the monoclinic 2/m one at 334 K. The first transition is manifested as anomalous temperature behaviou… Show more

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Cited by 20 publications
(19 citation statements)
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“…It is found that the intensity of the four reflections decreases almost along the straight lines with increasing temperature but the slope of the line turns into the same at about 340 Κ. These four strong reflections and the other reflections with the 1 odd disappeared at about 350 K. The obtained temperatures for the change of the slope and the disappearance of the chosen reflections are in good agreement with the phase transition temperatures as previously reported [2,3].…”
Section: Methodssupporting
confidence: 89%
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“…It is found that the intensity of the four reflections decreases almost along the straight lines with increasing temperature but the slope of the line turns into the same at about 340 Κ. These four strong reflections and the other reflections with the 1 odd disappeared at about 350 K. The obtained temperatures for the change of the slope and the disappearance of the chosen reflections are in good agreement with the phase transition temperatures as previously reported [2,3].…”
Section: Methodssupporting
confidence: 89%
“…It undergoes several successive structural phase transitions above the room temperature: the melting point at 1170 K, two high-temperature phase transitions at. 758 Κ and 730 K, and two low-temperature phase transitions at 346 Κ and 334 Κ [2,3]. The low-temperature structural transitions are detected by a set of independent experiments.…”
Section: Introductionmentioning
confidence: 99%
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“…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%
“…It undergoes successive structural phase transition above the room temperature: the melting point at 1170 K, two high temperature phase transitions at 758 K and 730 K and low temperature phase transitions at 346 K and 333 K [2,3]. Experimental studies of these materials show that K 3 Na(SO 4 ) 2 , K 3 Na(CrO 4 ) 2 and K 3 Na(SeO 4 ) 2 undergo ferroelastic phase transitions from a point group 3m1 to 2/m at about 70 K, 239 K and at 346 K, respectively [2,4,5]. Fabry et al [6] have studied the crystal structure at both phases of KNSe.…”
Section: Introductionmentioning
confidence: 99%