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1
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Dielectric Properties of NaNH_{4}SO_{4}·2H_{2}O-NaNH_{4}SeO_{4}·2H_{2}O Mixed Crystals Mixed Crystals

100%
Czupiński O., Mróz J.
Acta Physica Polonica A
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1993
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vol. 84
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issue 6
1125-1130
EN
The mixed crystals of NaNH_{4}SO_{4}·2H_{2}O-NaNH_{4}SeO_{4}·2H_{2}O were grown and their properties were investigated. Dielectric and differential thermal analysis studies allowed us to construct the phase diagram of the system with molar fraction, x, of NaNH_{4}SeO_{4}·2H_{2}O as a parameter. Nonlinear dependence of T_{c} versus composition was found.
2
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Ferroelectric Phase Transition in DC Electric Field in [NH_2(CH_3)_2]_3Sb_2Cl_9 Crystals

100%
Dziedzic J., Mróz J.
Acta Physica Polonica A
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2007
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vol. 111
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issue 6
873-876
EN
Dielectric investigations of ferro-paraelectric phase transition under influence of bias pooling DC electric field ranging from 0 to 500 kV/m were performed for [NH_2(CH_3)_2]_3Sb_2Cl_9. The linear shift of T_c towards higher temperatures was observed. The A_0 and B coefficients from the Landau state equation are determined.
3
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Study on Pyroelectric Properties of the TGS-TGSe Crystals with Internal Electric Field

100%
Dziedzic J., Mróz J.
Acta Physica Polonica A
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2005
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vol. 108
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issue 6
971-978
EN
Measurements of spontaneous polarization and pyroelectric coefficient versus temperature and electric field were performed for the TGS-TGSe crystals at a definite internal electric field. The obtained results are compared with the thermodynamic theory predictions. The temperature and electric field dependencies of pyroelectric coefficient are presented together with its maximal value as a function of the electric field intensity. It was shown that the temperature, at which the pyroelectric coefficient reaches its maximal value, depends on the external electric field.
4
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Phase Transitions in (CH_{3}NH_{3})_{5}Bi_{2}X_{11} (X=Cl, Br) Crystals

81%
Pykacz H., Mróz J., Jakubas R.
Acta Physica Polonica A
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1993
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vol. 84
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issue 6
1085-1091
EN
Electric properties of (CH_{3}NH_{3})_{5}Bi_{2}Cl_{11} and (CH_{3}NH_{3})_{5}Bi_{2}Br_{11} single crystals in the direction of the crystallographic b-axis were studied. The samples tested were natural crystal seeds in the form of thin plates, whose crystallographic b-axis coincides with the normal to the plate. Measurements of the pyroelectric coefficient were performed near the high temperature phase transition and spontaneous polarization from the paraelectric phase down to helium temperature. The attempt of explanation of the anomalous electric properties of these crystals has been presented.
5
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Anomalous Non-linear Dielectric Behaviour of LATGS Crystals

81%
Cach R., Mróz J., Haden D.
Acta Physica Polonica A
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1991
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vol. 79
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issue 6
905-914
EN
The dielectric permittivity in a biasing electric field and also the spontaneous polarization of LATGS crystals are measured near the ferroelectric phase transition. It is demonstrated that L-alanine admixtures change the parameters of dielectric state equation. It is shown that the bias field value decreases while approaching the phase transition temperature from the para-electric phase. The effective non-linearity coefficient B, near Tc, depends on electric field direction. This anomalous non-linear behaviour can be explained assuming asymmetric bias field dependence on external electric field.
6
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Dielectric and Pyroelectric Studies on [N(CH_{3})_{4}]_{3}Bi_{2}X_{9} (X = Cl, Br)

81%
Jakubas R., Bator G., Mróz J.
Acta Physica Polonica A
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1995
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vol. 87
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issue 3
663-669
EN
Dielectric properties of [N(CH_{3})_{4}]_{3}Bi_{2}X_{9} (X = Cl, Br) single crystals were measured in the frequency range 1 kHz - 1 MHz in the vicinity of structural phase transitions of first-order type at 152 K (Cl) and 183 K (Br). The pyroelectric effect was observed in [N(CH_{3})_{4}]_{3}Bi_{2}[N(CH_{3})_{4}]_{3}Bi_{2}Cl_{9} at structural phase transition (T_{c} = 152 K) with the ΔP_{s} of the order of 10^{-5} C m^{-2}. Polarized microscope observations show appearance of ferroelectric domain structure in [N(CH_{3})_{4}]_{3}Bi_{2}Br_{9} within the low temperature phase.
7
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The Internal Bias Field of Ferroelectric (CH_{3}NH_{3})_{5}Bi_{2}Br_{11}

81%
Pykacz H., Mróz J., Jakubas R.
Acta Physica Polonica A
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1992
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vol. 81
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issue 6
667-673
EN
Spontaneous polarization of (CH_{3}NH_{3})_{5}Bi_{2}Br_{11} crystals has been measured and the ferroelectric hysteresis loop has been studied. The observed time changes in the polarization have been ascribed to the change in the internal bias field of the crystal. Measurement results have also been discussed for the lower phase transition (T_{II} = 77 K).
8
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Pyroelectric and Dilatometric Studies on the Low Temperature Ferroelectric Phase Transition of (CH_3NH_3)_5Bi_2Br_{11}

81%
Dziedzic J., Mróz J., Jakubas R.
Acta Physica Polonica A
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2005
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vol. 108
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issue 3
505-511
EN
The results of the linear thermal expansion studies on (CH_3NH_3)_5Bi_2Br_{11} single crystals in the temperature range 60-340 K are presented. The thermal anomaly in the vicinity of 77 K is assigned to the phase transition classified as close to first order type. The pyroelectric measurements of (CH_3NH_3)_5Bi_2Br_{11} were carried out in the range of 45-320 K along the a- and c-axis. The step-like change in the spontaneous polarization along the a-axis at 77 K indicates a discontinuous character of ferroelectric transition.
9
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Dielectric Properties of the (CH_3NH_3)_5Bi_{2(1- x)}Sb_{2x}Cl_{11} Mixed Crystals

81%
Mróz J., Dziedzic J., Pykacz H.
Acta Physica Polonica A
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2006
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vol. 110
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issue 4
479-483
EN
The (CH_3NH_3)_5Bi_{2(1-x)}Sb_{2x}Cl_{11} crystals were examined from the point of view of their applicability in pyroelectric detectors. It was shown that they can be useful so far as the construction of infrared detectors is concerned due to high values of both their pyroelectric coefficient and figure of merit p/sqrtε which are both comparable with those of triglycine sulphate crystals.
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