Ferroelasticity of InI layered single crystals

Kityk, I.V.; Kolinko, M. I.; Франів, А. В.

doi:10.1080/00150199208008979

Cited by 9 publications

(6 citation statements)

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“…Two sharp maxima within the temperature range 45 to 65 K were revealed. Simultaneously, a very asymmetrical behaviour of these dependences was observed, which can be explained by the specific electron-phonon interaction in highly anisotropic crystalline media and indicates the possible appearance of a first-order phase transition, which leads to the occurrence of interlayer bending waves [5]. Moreover at a temperature of about 65 K three slightly different slopes were observed and during cooling there is only one slope at T x 62 to 64 K. For comparison measurements for the samples with concentrations 3 x lo-' mol% were performed.…”

Section: Resultsmentioning

confidence: 94%

Low‐Temperature Anomalies in the CdI²Cd Crystalline System

Bolesta

Kityk

Filipecki

et al. 1995

Physica Status Solidi (b)

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From the measurements of elastic coefficients, piezooptical constants, and dilatometrical lengthening the existence of an improper ferroelastic phase transition of first order in the CdI,-Cd single crystalline system within the temperature range 40 to 60 K is found. Different values of the temperature hysteresis are revealed for the piezooptical and elastic constants. From the data obtained an essential role of electron-phonon interaction in the appearance of the mentioned phase transitions is concluded. The obtained results clearly show that in the Cd1,-Cd single crystalline system at lower temperatures long-range forces appear between the impurity subsystems, which due to the specific electron-phonon interactions tend to the appearance of the phase transitions. The behaviour of the elastic constants and the lengthening indicate the possible ferroelastic nature of these transitions. Simultaneously the existence of the temperature hysteresis reflects the first-order nature of the mentioned transitions.

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Section: Resultsmentioning

confidence: 94%

Low‐Temperature Anomalies in the CdI²Cd Crystalline System

Bolesta

Kityk

Filipecki

et al. 1995

Physica Status Solidi (b)

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“…At the same time, the earlier performed dilatometric measurements [6,7] showed the occurrence of the spontaneous deformation in the temperature range 18-22 K, which allows one to classify unambiguously the above mentioned transition as the ferroelastic one.…”

Section: Pacs Numbers: 7780βhmentioning

confidence: 86%

“…2 one can see that the π2222 component is essentialy sensitive to the defectiveness of samples near the phase transition. In previous works [6,7] it was noted that the π3333 constant is insensitive to such kinds of influence. The temperature hysteresis within the 5 K is clearly observed, which points to the first order feature of this phase transition.…”

Section: Pacs Numbers: 7780βhmentioning

confidence: 99%

“…At the same time, the recent revelation of the low temperature phase transitions in these crystals [6,7] can present them as convenient model objects for the creation of phase transitions theory in high anisotropy media including those with the incommensurate phase. In the circumstances, it is very substantial that similar twodimensional systems are most susceptible to the appearance of the translational symmetry perturbations of different kind, above all at the expense of appearance of defects, dislocations and vacancies.…”

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Influence of Defects on Ferroelastic Phase Transition in InI Single Crystals

1993

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The influence of the defect subsystem on the behaviour of the structural incommensurate phase in II single crystals was investigated. The correlation between the incommensurate parameter ζ and the piezooptical π2222 tensor component was revealed.PACS numbers: 77.80.ΒhInI single crystals (space group D172h) are typical layered A 3 Β7 compounds with a pronounced anisotropy of the crystalline stucture and the corresponding optical properties [1][2][3][4][5]. At the same time, the recent revelation of the low temperature phase transitions in these crystals [6,7] can present them as convenient model objects for the creation of phase transitions theory in high anisotropy media including those with the incommensurate phase. In the circumstances, it is very substantial that similar twodimensional systems are most susceptible to the appearance of the translational symmetry perturbations of different kind, above all at the expense of appearance of defects, dislocations and vacancies. The last ones are in particular fashion exhibited in modulated superstructures [8].The goal of this work is to describe the influence of the defect subsystem on phase transitions in InI single crystals, because the layering of structure allows one to control smoothly the corresponding parameters.The initial samples were synthesized using reaction between the pure metallic indium and iodine in a hermetical quartz ampoule. After the band cleaning and distillation in the vacuum, single crystals have been grown by the Bridgman method [9]. Independently of crystal perfection all the cleaved monocrystalline specimens possessed mirror surfaces of high quality in αc-plane, which did not require additional polishing. The stuctural parameters were checked using the X-ray DROΝ-05 diffractometer. The temperature measurements were performed in the range 4.2-500 K and were stabilized within 0.1-0.2 K•min -1 . The Senarmon method (λ = 0.6328 μm) was used for measuring of the piezooptical constants.Testing of samples quality was performed by the X-ray method. The broadening of X-ray satellite reflexes permits to select crystals of different quality. To obtain smooth change of the specimens quality, they were annealed in non-inertial (1065)

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“…For example, there is observed an enhanced attention to the study of physical properties of the crystalline semiconductor compounds A III B VII , including binary layered crystals [3,4]. The traditional crystals with heavy cations, like TlI and TlIn-I [5,6], may serve as the suitable modeling crystals and as those for the search and design of novel crystals. Following Ref.…”

Section: Introductionmentioning

confidence: 99%

Specific Features of Content Dependences for Energy Gap in In_xTl_1-xI Solid State Crystalline Alloys

et al. 2018

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A series of InxTl1−xI (x = 0.4−0.9) single crystalline solid state alloys were successfully synthesized by the vertical Bridgman method. For the first time the density functional theory based band structure calculations are performed and features of the band energy dispersion are discussed. Comparison with the experimental energy gap Eg obtained from the optical photoconductivity is discussed. An essential role of the localized defects and excitons in formation of the edge photoconductivity is analyzed. Relation between the crystal structure and photoconductivity of the materials studied is discussed. Also the origin of the principal valence and conduction bands is explored. Experimental measurements of the band gap Eg by the optical and photoconductivity methods have given opposite dependences with respect to the indium content x. Features of the photoconductivity spectra for different crystallographic directions have been discussed with taking into account the chemical bonds anisotropy.

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Ferroelasticity of InI layered single crystals

Cited by 9 publications

References 0 publications

Low‐Temperature Anomalies in the CdI²Cd Crystalline System

Low‐Temperature Anomalies in the CdI²Cd Crystalline System

Influence of Defects on Ferroelastic Phase Transition in InI Single Crystals

Specific Features of Content Dependences for Energy Gap in In_xTl_1-xI Solid State Crystalline Alloys

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Ferroelasticity of InI layered single crystals

Cited by 9 publications

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Low‐Temperature Anomalies in the CdI2Cd Crystalline System

Low‐Temperature Anomalies in the CdI2Cd Crystalline System

Influence of Defects on Ferroelastic Phase Transition in InI Single Crystals

Specific Features of Content Dependences for Energy Gap in InxTl1-xI Solid State Crystalline Alloys

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Product

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Low‐Temperature Anomalies in the CdI²Cd Crystalline System

Low‐Temperature Anomalies in the CdI²Cd Crystalline System

Specific Features of Content Dependences for Energy Gap in In_xTl_1-xI Solid State Crystalline Alloys