Ferroelectricity in (CH3NH3)5Bi2Br11 crystals

Μróz, J.; Jakubas, R.

doi:10.1016/0038-1098(89)90915-0

Cited by 34 publications

(12 citation statements)

References 3 publications

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“…Repeating several times the measurements for different samples it was possible to observe a certain scattering of the spontaneous polarization changes at the temperature of 77 K. We presume that this is connected with the division of the single crystal into domains. Contrary to the b-direction the spontaneous polarization along the c-axis increases in a continuous manner during cooling, and its value is much greater than for the b-axis [10]. The temperature dependence of the spontaneous polarization for (CΗ3ΝH3)5Bi2Cl11 crystal in the direction of the b-axis is presented in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…[9] show non-typical behaviour of the (CH3ΝΗ3)5Bi2Br11 crystals. In the low temperature region both analogues display the second-order phase transition with dielectric anomaly seen along the c-axis [10,11]. The nontypical behaviour of spontaneous polarization [9] prompted us to examine electric properties along the b-axis in these crystals.…”

Section: Introductionmentioning

confidence: 99%

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Phase Transitions in (CH₃NH₃)₅Bi₂X₁₁(X=Cl, Br) Crystals

1993

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Electric properties of (CΗ3ΝΗ3)5 Bi2C111 and (CΗ3ΝΗ3)5Βi2Br11 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.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Transitions in (CH₃NH₃)₅Bi₂X₁₁(X=Cl, Br) Crystals

1993

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“…These results indicate that the ferro-paraelectric transition is of the order-disorder type. Dielectric and pyroelectric measurements of MAPBB have revealed [9] that the crystal undergoes a continuous PT at 77 K into a polar phase (III) visible as a distinct peak of εc (εmaxi = 60). However, there are some divergences with respect to the nature of the low temperature anomaly found at 170 K in MAPCB.…”

Section: Introductionmentioning

confidence: 99%

Thermal Expansion of (CH₃NH₃)₅Bi₂X₁₁(X=Cl, Br) Crystals in the Temperature Range from 80 to 300 K

1994

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“…Dielectric anomaly [1], [3][4][5][6], differential scanning calorimeter (DSC) [7], birefringence [8], and dilatometric [9] studies confirm the continuous character of the ferro-paraelectric phase transition. The second much smaller dielectric anomaly along the c-direction at 77 Κ was interpreted as a phase transition [4], [10].…”

Section: Introductionmentioning

confidence: 99%

“…The extremal values of the ratio Cp/Cf of the Curie constants in the para-and ferroelectric phases are equal to 3.6 [1] and 5.6 [4]. Spontaneous polarization in units of 10 -2 C/m2 below the phase transition temperature T^ ranges from 0.7 (ΔΤ = 27 K) [1] to 1.75 (ΔΤ = 12 K) [10]. Character of some phenomena observed in that crystal is not typical, namely high Cp /Cf, anomalous electric permittivity along the sand b-directions [1] and discrepancy in the values of the spontaneous polarization for crystals biased with different electric fields [6].…”

Section: Introductionmentioning

confidence: 99%