Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl<sub>1-x</sub>Cr<sub>x</sub>S Crystals

Kapustianyk, V.; Eliyashevskyy, Yu.; Czapla, Z.; Dacko, S.; Czupiński, O.; Rudyk, V.; Serkiz, R.; Sereda, S.; Semak, S.

doi:10.12693/aphyspola.127.791

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…A DC electric eld of 7.9 kV/m applied during cooling reveals peaks in the pyroelectric currents for both samples and demonstrates Cr dependent T c evolution. e temperature dependences of the dielectric properties for both investigated crystals fairly well correlate with the data of previous investigations 37 and obey the Curie-Weiss law both in the paraelectric (+) and ferroelectric (−) phases in the vicinity of the ferroelectric phase transition. Together with the data of DSC study 37 this clearly con rms a second order of the phase transition.…”

Section: Resultssupporting

confidence: 87%

“…e phase transition is of the order-disorder type with a symmetry change 2/m → m. It is connected with ordering of the polar DMA cations which execute hindered rotations around their C-C direction in the paraelectric phase and order only in the spatio-temporal average in the ferroelectric phase 35 . Metal ion isomorphous substitution in the above mentioned family of compounds can be an additional degree of freedom in the composition-property engineering 36,37 . Here we report that the incorporated magnetic Cr cations can participate in ME interactions in the [NH 2 (CH 3 ) 2 ]Al 1−x Cr x (SO 4 ) 2 × 6H 2 O crystals with ability to tune magneto-electric functionality.…”

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confidence: 99%

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Tuning a sign of magnetoelectric coupling in paramagnetic NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O crystals by metal ion substitution

Kapustianyk

Eliyashevskyy

Czapla

et al. 2017

Sci Rep

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Hybrid organometallic systems offer a wide range of functionalities, including magnetoelectric (ME) interactions. However, the ability to design on-demand ME coupling remains challenging despite a variety of host-guest configurations and ME phases coexistence possibilities. Here, we report the effect of metal-ion substitution on the magnetic and electric properties in the paramagnetic ferroelectric NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O. Doing so we are able to induce and even tune a sign of the ME interactions, in the paramagnetic ferroelectric (FE) state. Both studied samples with x = 0.065 and x = 0.2 become paramagnetic, contrary to the initial diamagnetic compound. Due to the isomorphous substitution with Cr the ferroelectric phase transition temperature (T c) increases nonlinearly, with the shift being larger for the 6.5% of Cr. A magnetic field applied along the polar c axis increases ferroelectricity for the x = 0.065 sample and shifts T c to higher values, while inverse effects are observed for x = 0.2. The ME coupling coefficient αME = 1.7 ns/m found for a crystal with Cr content of x = 0.2 is among the highest reported up to now. The observed sign change of αME with a small change in Cr content paves the way for ME coupling engineering.

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Section: Resultssupporting

confidence: 87%

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confidence: 99%

Tuning a sign of magnetoelectric coupling in paramagnetic NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O crystals by metal ion substitution

Kapustianyk

Eliyashevskyy

Czapla

et al. 2017

Sci Rep

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“…Previous studies showed that substitution of aluminium with chromium in the isomorphic analogue DMAAlS crystals noticeably affects the phase transition temperature [6,7]. Moreover, paper [8] reported a successful creation of the paramagnetic order in the initially diamagnetic DMAAlS crystal by such an isomorphous substitution of a metal ion.…”

Section: Introductionmentioning

confidence: 95%

“…Curie-Weiss law parameters for DMAGaS and DMAAlS doped with chromium in different concentration (the data marked with * are taken from[7]). …”

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confidence: 99%

The effect of metal ion substitution on the dielectric dispersion in NH2(CH3)2Ga_{1-x}Cr_x(SO4)2 · 6H2O crystals

Kapustianyk¹,

Semak²,

Eliyashevskyy³

et al. 2019

J. Phys. Stud.

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The comparative study of the dielectric dispersion in the vicinity of the ferroelectric-ferroelastic phase transition in NH2(CH3)2Ga1−xCrx(SO4)2 • 6H2O (x = 0; 0.065) crystals was performed. As it follows from the analysis of the temperature-frequency dependences of the dielectric permittivity and the Cole-Cole diagrams, the dielectric dispersion is connected with a critical slowing down of the dipole relaxation (fundamental dispersion) in the high frequency range and with the domain wall dynamics at lower frequencies of the measuring electric field. It has been shown that the metal ion substitution practically does not affect the temperatures of phase transitions but manifests itself in the parameters of the low frequency dielectric dispersion. The substitution of gallium with chromium is followed by an increase in the relaxation time, the activation energy and the half-width of the Gaussian, which describes the distribution of the relaxation times. This was explained by the fact that chromium ions, due to their larger sizes in comparison with gallium ions, cause local lattice deformations. The latter promote the formation of more massive dipole clusters in the vicinity of the ferroelectric phase transition.

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“…Taking into account that the ferroelectric ordering is realized in the numerous organic-inorganic ferroics [24][25][26][27][28][29][30][31][32][33][34][35][36][37][38], the substitution of the metal ion in the inorganic anionic complexes would give the possibility to introduce the magnetic ordering into a previously diamagnetic matrix. In such a way using, for example, the partial metal ion substitution one can generate the magnetoelectric effect in the known ferroelectric material.…”

Section: Introductionmentioning

confidence: 99%

Chromium doped NH₂(CH₃)₂Ga(SO₄)₂ × 6H₂O crystal – representative of a new family of magnetoelectric materials

Kapustianyk

Eliyashevskyy²,

Mostovoi³

et al. 2022

Mater. Res. Express

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The paper is devoted to the detailed study of electric and magnetic properties and magnetoelectric interactions in NH2(CH3)2Ga(SO4)2×6H2O crystals doped with chromium – DMAGaS:Cr. The temperature dependence of the specific heat revealed clear evidence of a series of phase transitions related to the electric dipoles ordering. The different types of the DMA cation ordering in the structure of DMAGaS:Cr were evidenced in the temperature evolution of the EPR spectra. In addition, a considerable magnetoelectric coupling was demonstrated within the paramagnetic and ferroelectric phase of DMAGaS:Cr crystal. In the narrow temperature range in the vicinity of the Curie point, this crystal was found to possess the largest values of the coefficient of ME interaction as well as the largest magnetodielectric effect within the family of ferroics with organic cation. The model describing the ME effect was proposed. The magnetic field through the magnetostriction effect changes the level of the local lattice deformations caused by metal ion substitution. The applied magnetic field changes Cr-Cr distances and modifies the hydrogen bonds and process of DMA group ordering, affecting spontaneous polarization.

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Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_1-xCr_xS Crystals

Cited by 9 publications

References 8 publications

Tuning a sign of magnetoelectric coupling in paramagnetic NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O crystals by metal ion substitution

Tuning a sign of magnetoelectric coupling in paramagnetic NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O crystals by metal ion substitution

The effect of metal ion substitution on the dielectric dispersion in NH2(CH3)2Ga_{1-x}Cr_x(SO4)2 · 6H2O crystals

Chromium doped NH₂(CH₃)₂Ga(SO₄)₂ × 6H₂O crystal – representative of a new family of magnetoelectric materials

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Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl1-xCrxS Crystals

Cited by 9 publications

References 8 publications

Tuning a sign of magnetoelectric coupling in paramagnetic NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O crystals by metal ion substitution

Tuning a sign of magnetoelectric coupling in paramagnetic NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O crystals by metal ion substitution

The effect of metal ion substitution on the dielectric dispersion in NH2(CH3)2Ga_{1-x}Cr_x(SO4)2 · 6H2O crystals

Chromium doped NH2(CH3)2Ga(SO4)2 × 6H2O crystal – representative of a new family of magnetoelectric materials

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Product

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Phase Transitions and Fundamental Ferroelectric Dispersion in DMAAl_1-xCr_xS Crystals

Chromium doped NH₂(CH₃)₂Ga(SO₄)₂ × 6H₂O crystal – representative of a new family of magnetoelectric materials