Jan Dec | University of Silesia in Katowice (original) (raw)

Papers by Jan Dec

InTech eBooks, Aug 23, 2011

The Japan Society of Applied Physics, Feb 8, 2018

The Japan Society of Applied Physics, 2017

IOP Conference Series: Materials Science and Engineering, 2013

Optically transparent single crystals of strontium-barium niobate, Sr x Ba 1-x Nb 2 O 6 , of diff... more Optically transparent single crystals of strontium-barium niobate, Sr x Ba 1-x Nb 2 O 6 , of different compositions (x = 0.26…0.7) were examined with the aid of conoscopic light interference figures. A regular change of the isochrome concentric ring number and diameters consistent with the temperature variation of the value of birefringence is demonstrated by direct observations of polar cuts of optically uniaxial samples. Anomalous violations of the conventional (uniaxial) interference patterns occur occasionaly in some samples being indicative of the existence of biaxial trait in their behaviour even though no voltage is applied. These features may depend on annealing treatments at elevated temperatures. The results of the study show that conoscopic images may serve as a sensitive indicator of the structural state of SBN crystals related to the effects of stress-induced change of optical anisotropy and temperature dependent birefringence parameters.

AIP Conference Proceedings, 2003

Two different non‐Debye dielectric spectra are observed in different low‐frequency regimes in a p... more Two different non‐Debye dielectric spectra are observed in different low‐frequency regimes in a polydomain relaxor ferroelectric single crystal, SrTi18O3, below its transition temperature, Tc ≈ 23 K. At f 1 kHz. The crossover between both kinds of dielectric response is attributed to a dynamical phase transition [Nattermann et al., 2001].

Phase Transitions, 2007

The dielectric susceptibility of strontium–barium niobate, Sr0.75Ba0.25Nb2O6, reveals strong hole... more The dielectric susceptibility of strontium–barium niobate, Sr0.75Ba0.25Nb2O6, reveals strong hole-like aging behaviour in its ferroelectric state. The isothermal evolution of the linear susceptibility satisfactorily follows a stretched exponential law. After aging the sample at a selected temperature both rejuvenation and memory effects are observed in temperature cycle experiments. They seem to indicate cluster glass-like properties of the domain state involved.

Journal of Physics D: Applied Physics, 2000

ABSTRACT

Ferroelectrics, 1997

ABSTRACT

Journal of Physics: Condensed Matter, 1989

ABSTRACT

Ferroelectrics, 2020

Abstract In this work, we report on the results of the examination of the nonlinear dielectric re... more Abstract In this work, we report on the results of the examination of the nonlinear dielectric response of layered ferrielectic CuInP2S6 and Cu0.9Ag0.1InP2S6 crystals. The temperature behaviour of the nonlinear dielectric properties of ferrielectic CuInP2S6 and Cu0.9Ag0.1InP2S6 is found to be consistent with Landau theory. The additional peak of the third-order nonlinear susceptibility in these crystals, below the phase transition temperature, is strongly influenced by the electric field amplitude, and it is caused by the ferroelectric domain dynamics. The nonzero value of the second-order susceptibility and the mismatch between the temperatures of linear and third-order susceptibilities indicate that some polarisation exists above the phase transition temperature.

Mesoscopic ferroic glasses such as strain glass, cluster spin-glass, and nanopolar glassy relaxor... more Mesoscopic ferroic glasses such as strain glass, cluster spin-glass, and nanopolar glassy relaxors are of paramount importance in the phase diagrams of complex ferroic materials. All of them are based on supercritical chemical disorder and are preceded by precursor patterns of elastic/magnetic tweed or polar nanoregions, respectively. Within this general scheme we comment on the properties of (1) superdipolar glassy relaxors PbMg1/3Nb2/3O3 and Sr0.8Ba0.2Nb2O3 in some detail, (2) structural strain glass Ti50−xNi50+x martensite with tweed patterns, and (3) magnetic cluster glass La0.7Ca0.3Mn0.85Cd0.15O3 with tweed precursor. All of these mesoscopic “ferroic glasses” with their complex chemical disorder must be distinguished from “superspin glasses,” which are known as systems of widely dispersed nanoparticles with fixed magnetic moments and inert nonmagnetic environment, e.g., multilayers (Co80Fe20/Al2O3)10. Nonetheless, at the (super)glass transitions both families of materials exhib...

Materials Chemistry and Physics, 2018

Ferroelectric and relaxor-like phases coexist in K 0.92 Li 0.08 TaO 3. • Phase transition to the ... more Ferroelectric and relaxor-like phases coexist in K 0.92 Li 0.08 TaO 3. • Phase transition to the ferroelectric state in K 0.92 Li 0.08 TaO 3 is first-order type. • Ferroelectricity in K 1-x Li x TaO 3 is due to off-center motions of Ta +5 ions.

Ferroelectrics, 2019

Mesoscopic ferroic glasses such as martensitic strain glass Ti 50Àx Ni 50þx , magnetic cluster gl... more Mesoscopic ferroic glasses such as martensitic strain glass Ti 50Àx Ni 50þx , magnetic cluster glass La 0.7 Ca 0.3 Mn 0.7 Cd 0.3 O 3 , and superdipolar relaxor PbMg 1/3 Nb 2/3 O 3 (PMN) undergo glass transitions preceded by mesoscopic precursor patternselastic or magnetic tweed or polar nanoregions (PNR), respectively. In PMN the PNR glass transition at T g % 240 K reveals glassy dynamic criticality and non-ergodicity of the field-induced low-T phase similar to that of a superspin glass of fixed magnetic nanoparticles in a diamagnetic environment. A final ferroelectric domain state is reached at T p % 213 K via PNR percolation, which is absent in weak relaxors like BaTi 0.65 Zr 0.35 O 3 (BTZ35).

Japanese Journal of Applied Physics, 2016

The electric field effects on the elastic properties of uniaxial Ca x Ba1− x Nb2O6 (x = 0.30, CBN... more The electric field effects on the elastic properties of uniaxial Ca x Ba1− x Nb2O6 (x = 0.30, CBN30) single crystals were investigated using broadband Brillouin scattering spectroscopy as functions of temperature and electric field. Remarkable thermal hysteresis was observed between zero field heating and zero field cooling processes. A stretching index β = 2.05 indicates the stretched critical slowing down of polar nanoregions (PNRs). The effect of electric field along [001] direction was clearly observed. Under 1.0 kV/cm field, the alignment of nanodomains and enhancement of the long-range ferroelectric order were observed in the ferroelectric phase. In the field dependent measurement, a mixed state consisting of macrodomains induced by the electric field and nanodomains caused by the random fields was observed at 3.0 kV/cm. The mixed state persists up to 13 kV/cm because of the incomplete switching of the nanodomains to the macrodomains state. A very strong memory effect was also...

Applied Physics Letters, 2014

ABSTRACT The electric susceptibilities χ1, χ2, and χ3 of BaTi1−xSnxO3 ceramics with 0.175 ≤ x ≤ 0... more ABSTRACT The electric susceptibilities χ1, χ2, and χ3 of BaTi1−xSnxO3 ceramics with 0.175 ≤ x ≤ 0.30 are measured at 90 ≤ T ≤ 350 K and 37 ≤ f ≤ 106 Hz. Crossover from ferroelectric (x = 0.175) to relaxor behavior (x = 0.30) via coexistence of both (x = 0.25) is indicated by increasing polydispersivity and suppression of χ2 intensity. The relaxor properties are due to weak random fields acting on dipolar Ti4+ clusters in non-polar Sn4+ environment. Upon cooling frustrated interaction between the blocked polar nanoregions yields a cluster glass ground state for x = 0.30 as verified by the dynamic criticality of χ1, χ3, and the scaled non-linear susceptibility a3.

Crystal Research and Technology, 2017

High quality of solid solution single crystals Sr x Ba 1-x Nb 2 O 6 (0.35 <x < 0.72) obtained by ... more High quality of solid solution single crystals Sr x Ba 1-x Nb 2 O 6 (0.35 <x < 0.72) obtained by the Czochralski method were investigated. The lattice parameters of these single crystals were determined, using X-ray measurements, with an uncertainty as low as of the order of d/d = 10 −5. Registered temperature changes of lattice parameters have permitted to calculate thermal expansion coefficients with low relative uncertainties, which were determined in the temperature range from 293 to 323 K along [100] and [001] directions. Based on the thermal expansion coefficients it was possible to assign the phase transition temperature −T C for all studied compositions. Additionally, the observed character of changes of the linear thermal expansion coefficients clearly indicates a possible first-order character of the investigated structural phase transition.

InTech eBooks, Aug 23, 2011

The Japan Society of Applied Physics, Feb 8, 2018

The Japan Society of Applied Physics, 2017

IOP Conference Series: Materials Science and Engineering, 2013

Optically transparent single crystals of strontium-barium niobate, Sr x Ba 1-x Nb 2 O 6 , of diff... more Optically transparent single crystals of strontium-barium niobate, Sr x Ba 1-x Nb 2 O 6 , of different compositions (x = 0.26…0.7) were examined with the aid of conoscopic light interference figures. A regular change of the isochrome concentric ring number and diameters consistent with the temperature variation of the value of birefringence is demonstrated by direct observations of polar cuts of optically uniaxial samples. Anomalous violations of the conventional (uniaxial) interference patterns occur occasionaly in some samples being indicative of the existence of biaxial trait in their behaviour even though no voltage is applied. These features may depend on annealing treatments at elevated temperatures. The results of the study show that conoscopic images may serve as a sensitive indicator of the structural state of SBN crystals related to the effects of stress-induced change of optical anisotropy and temperature dependent birefringence parameters.

AIP Conference Proceedings, 2003

Two different non‐Debye dielectric spectra are observed in different low‐frequency regimes in a p... more Two different non‐Debye dielectric spectra are observed in different low‐frequency regimes in a polydomain relaxor ferroelectric single crystal, SrTi18O3, below its transition temperature, Tc ≈ 23 K. At f 1 kHz. The crossover between both kinds of dielectric response is attributed to a dynamical phase transition [Nattermann et al., 2001].

Phase Transitions, 2007

The dielectric susceptibility of strontium–barium niobate, Sr0.75Ba0.25Nb2O6, reveals strong hole... more The dielectric susceptibility of strontium–barium niobate, Sr0.75Ba0.25Nb2O6, reveals strong hole-like aging behaviour in its ferroelectric state. The isothermal evolution of the linear susceptibility satisfactorily follows a stretched exponential law. After aging the sample at a selected temperature both rejuvenation and memory effects are observed in temperature cycle experiments. They seem to indicate cluster glass-like properties of the domain state involved.

Journal of Physics D: Applied Physics, 2000

ABSTRACT

Ferroelectrics, 1997

ABSTRACT

Journal of Physics: Condensed Matter, 1989

ABSTRACT

Ferroelectrics, 2020

Abstract In this work, we report on the results of the examination of the nonlinear dielectric re... more Abstract In this work, we report on the results of the examination of the nonlinear dielectric response of layered ferrielectic CuInP2S6 and Cu0.9Ag0.1InP2S6 crystals. The temperature behaviour of the nonlinear dielectric properties of ferrielectic CuInP2S6 and Cu0.9Ag0.1InP2S6 is found to be consistent with Landau theory. The additional peak of the third-order nonlinear susceptibility in these crystals, below the phase transition temperature, is strongly influenced by the electric field amplitude, and it is caused by the ferroelectric domain dynamics. The nonzero value of the second-order susceptibility and the mismatch between the temperatures of linear and third-order susceptibilities indicate that some polarisation exists above the phase transition temperature.

Mesoscopic ferroic glasses such as strain glass, cluster spin-glass, and nanopolar glassy relaxor... more Mesoscopic ferroic glasses such as strain glass, cluster spin-glass, and nanopolar glassy relaxors are of paramount importance in the phase diagrams of complex ferroic materials. All of them are based on supercritical chemical disorder and are preceded by precursor patterns of elastic/magnetic tweed or polar nanoregions, respectively. Within this general scheme we comment on the properties of (1) superdipolar glassy relaxors PbMg1/3Nb2/3O3 and Sr0.8Ba0.2Nb2O3 in some detail, (2) structural strain glass Ti50−xNi50+x martensite with tweed patterns, and (3) magnetic cluster glass La0.7Ca0.3Mn0.85Cd0.15O3 with tweed precursor. All of these mesoscopic “ferroic glasses” with their complex chemical disorder must be distinguished from “superspin glasses,” which are known as systems of widely dispersed nanoparticles with fixed magnetic moments and inert nonmagnetic environment, e.g., multilayers (Co80Fe20/Al2O3)10. Nonetheless, at the (super)glass transitions both families of materials exhib...

Materials Chemistry and Physics, 2018

Ferroelectric and relaxor-like phases coexist in K 0.92 Li 0.08 TaO 3. • Phase transition to the ... more Ferroelectric and relaxor-like phases coexist in K 0.92 Li 0.08 TaO 3. • Phase transition to the ferroelectric state in K 0.92 Li 0.08 TaO 3 is first-order type. • Ferroelectricity in K 1-x Li x TaO 3 is due to off-center motions of Ta +5 ions.

Ferroelectrics, 2019

Mesoscopic ferroic glasses such as martensitic strain glass Ti 50Àx Ni 50þx , magnetic cluster gl... more Mesoscopic ferroic glasses such as martensitic strain glass Ti 50Àx Ni 50þx , magnetic cluster glass La 0.7 Ca 0.3 Mn 0.7 Cd 0.3 O 3 , and superdipolar relaxor PbMg 1/3 Nb 2/3 O 3 (PMN) undergo glass transitions preceded by mesoscopic precursor patternselastic or magnetic tweed or polar nanoregions (PNR), respectively. In PMN the PNR glass transition at T g % 240 K reveals glassy dynamic criticality and non-ergodicity of the field-induced low-T phase similar to that of a superspin glass of fixed magnetic nanoparticles in a diamagnetic environment. A final ferroelectric domain state is reached at T p % 213 K via PNR percolation, which is absent in weak relaxors like BaTi 0.65 Zr 0.35 O 3 (BTZ35).

Japanese Journal of Applied Physics, 2016

The electric field effects on the elastic properties of uniaxial Ca x Ba1− x Nb2O6 (x = 0.30, CBN... more The electric field effects on the elastic properties of uniaxial Ca x Ba1− x Nb2O6 (x = 0.30, CBN30) single crystals were investigated using broadband Brillouin scattering spectroscopy as functions of temperature and electric field. Remarkable thermal hysteresis was observed between zero field heating and zero field cooling processes. A stretching index β = 2.05 indicates the stretched critical slowing down of polar nanoregions (PNRs). The effect of electric field along [001] direction was clearly observed. Under 1.0 kV/cm field, the alignment of nanodomains and enhancement of the long-range ferroelectric order were observed in the ferroelectric phase. In the field dependent measurement, a mixed state consisting of macrodomains induced by the electric field and nanodomains caused by the random fields was observed at 3.0 kV/cm. The mixed state persists up to 13 kV/cm because of the incomplete switching of the nanodomains to the macrodomains state. A very strong memory effect was also...

Applied Physics Letters, 2014

ABSTRACT The electric susceptibilities χ1, χ2, and χ3 of BaTi1−xSnxO3 ceramics with 0.175 ≤ x ≤ 0... more ABSTRACT The electric susceptibilities χ1, χ2, and χ3 of BaTi1−xSnxO3 ceramics with 0.175 ≤ x ≤ 0.30 are measured at 90 ≤ T ≤ 350 K and 37 ≤ f ≤ 106 Hz. Crossover from ferroelectric (x = 0.175) to relaxor behavior (x = 0.30) via coexistence of both (x = 0.25) is indicated by increasing polydispersivity and suppression of χ2 intensity. The relaxor properties are due to weak random fields acting on dipolar Ti4+ clusters in non-polar Sn4+ environment. Upon cooling frustrated interaction between the blocked polar nanoregions yields a cluster glass ground state for x = 0.30 as verified by the dynamic criticality of χ1, χ3, and the scaled non-linear susceptibility a3.

Crystal Research and Technology, 2017

High quality of solid solution single crystals Sr x Ba 1-x Nb 2 O 6 (0.35 <x < 0.72) obtained by ... more High quality of solid solution single crystals Sr x Ba 1-x Nb 2 O 6 (0.35 <x < 0.72) obtained by the Czochralski method were investigated. The lattice parameters of these single crystals were determined, using X-ray measurements, with an uncertainty as low as of the order of d/d = 10 −5. Registered temperature changes of lattice parameters have permitted to calculate thermal expansion coefficients with low relative uncertainties, which were determined in the temperature range from 293 to 323 K along [100] and [001] directions. Based on the thermal expansion coefficients it was possible to assign the phase transition temperature −T C for all studied compositions. Additionally, the observed character of changes of the linear thermal expansion coefficients clearly indicates a possible first-order character of the investigated structural phase transition.