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Hlinka, J.; Gregora, I.; Vorlı́ček, V.

doi:10.1103/physrevb.65.064308

Cited by 35 publications

(24 citation statements)

References 25 publications

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“…Besides, the maxima at 142, 183, and 244 cm . Note that the frequency positions of all these bands correlate with the known Sn 2 P 2 S 6 phonon spectrum [9] as well as with our earlier measurements for Sn 2 P 2 S 6 micro-and nanopowders and ceramics where features near 85, 140, 185, 245, 260, and 290 cm −1 were observed [22]. The observed features clearly confirm Sn 2 P 2 S 6 crystallite formation in the glass matrix under annealing.…”

Section: Resultssupporting

confidence: 72%

“…At ambient pressure, the Sn 2 P 2 S 6 crystal undergoes a second-order structural transition from the ferroelectric phase (Pn) to the paraelectric (P2 1 /n) one at 337 K, which was thoroughly investigated by X-ray diffraction [5], dielectric studies [6], Raman scattering [7][8][9], inelastic neutron scattering [10], ultrasonic measurements [11], optical spectroscopy [12], birefringence measurements [13], Mössbauer spectroscopy [14,15], X-ray photoelectron spectroscopy [16,17], soft X-ray fluorescence spectroscopy [16], and thermal expansion studies [18]. In most cases, these studies were carried out for good quality bulk single crystals.…”

Section: Introductionmentioning

confidence: 99%

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Annealing-induced formation of Sn2P2S6 crystallites in As2S3-based glass matrix

Azhniuk¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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Abstract. Sn-As-P-S glasses were obtained using co-melting of pre-synthesized As 2 S 3 and Sn 2 P 2 S 6 . Their structure and composition were confirmed by X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, and micro-Raman scattering. Crystallization of Sn 2 P 2 S 6 crystallites from the glass matrix is observed at annealing under relatively low temperatures (410…580 K).

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Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Annealing-induced formation of Sn2P2S6 crystallites in As2S3-based glass matrix

Azhniuk¹

2015

Semicond. Phys. Quantum Electron. Optoelectron.

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“…The final set of parameters given in table 1, was chosen by selecting the best agreement of the calculated phonon frequencies in the Brillouin zone (BZ) centre with the frequencies obtained from the RS spectra [7,12]. To make a comparison possible table 2 gives experimental data and the values of the calculated frequencies.…”

Section: Resultsmentioning

confidence: 99%

“…The dynamic properties of these crystals have been under consideration in a series of experimental works [7][8][9][10][11][12]. In [13], in particular, it has been shown that PT in Sn 2 P 2 S 6 lies in the crossover region from the "displacement" type to the "order-disorder" type.…”

Section: Introductionmentioning

confidence: 99%

Lattice dynamics and phase transitions in Sn_{2}P_{2}S(Se)_{6} ferroelectric crystals

Yevych¹,

Vysochanskii²

2006

Condens. Matter Phys.

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Polarizable ion model was used in describing the lattice dynamics in the Sn 2 P 2 S 6 and Sn 2 P 2 Se 6 ferroelectric crystals and their solid solutions. There has been obtained a good agreement of the calculated phonon spectra with the experimental data of Raman and Brillouin spectroscopies, neutron scattering and ultrasound experiments. Paraelectric phase instability has been modelled by negative charge transferring from the tin cations to the chalcogen ions, and by increasing the polarizabilities of the latter. The ferroelectric phase has been stabilized by tin atom displacement from centrosymmetric positions and a partial reversal recharging between tin and chalcogen ions. The effective charges decreasing by moving from Sn 2 P 2 S 6 to Sn 2 P 2 Se 6 compounds determine the shift of condensation wave vector of soft optic phonons in paraelectric phase from q = 0 in sulfur compound to q > 0 in selenium compound. Such a change of dynamical instability character is connected with the appearance of incommensurate phase in Sn 2 P 2 (SexS 1−x ) 6 solid solution under x > 0.28. The "two-mode" instability emerged as possible in the vicinity of Lifshitz point -there have been modelled the condensation of soft optic mode with q ≈ 0 and mixed optic and transversal acoustic phonons near q > 0. This fact requires further experimental and theoretical investigations.

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“…The temperature dependence of soft mode frequency in ferroelectric phase of Sn 2 P 2 S 6 crystals was investigated using Raman spectroscopy method in [19,20]. According to these data, the soft mode has a frequency of about 42 cm −1 at T → 0, and decreases to 27 cm −1 at T = 300 K. Using these data one can obtain the following relation [14] …”

Section: Low-temperature Limitmentioning

confidence: 99%

The second order phase transition in Sn_2P_2S_6 crystals: anharmonic oscillator model

Yevych¹,

Vysochanskii²

2008

Condens. Matter Phys.

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Statistical theory for ferroelectrics based on triple well anharmonic potential was used for the case of structural second order phase transition in Sn 2 P 2 S 6 crystals. Parameters of effective Hamiltonian of the model were estimated using available experimental data. These findings confirm the assumption that the phase transition in these crystals is located in crossover region between order-disorder and displacive type, and very closely to tricritical point.

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Complete spectrum of long-wavelength phonon modes inSn2P2S6

Cited by 35 publications

References 25 publications

Annealing-induced formation of Sn2P2S6 crystallites in As2S3-based glass matrix

Annealing-induced formation of Sn2P2S6 crystallites in As2S3-based glass matrix

Lattice dynamics and phase transitions in Sn_{2}P_{2}S(Se)_{6} ferroelectric crystals

The second order phase transition in Sn_2P_2S_6 crystals: anharmonic oscillator model

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