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Ferroelastic Phase Transition in a Layered Bismuth Oxychloride Single Crystals

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Bunda V., Bunda S., Vashchuk F., Feher A., Kajňaková M., Kováč J., Syrkin E.
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issue 5
1069-1070
EN
We report the results of low-temperature specific-heat, magnetization, and X-ray diffraction measurements on a bismuth oxyhalide (BiOCl) single crystal. We conclude that BiOCl in temperature region 150-230 K shows "antiferroelastic-paraelectric" phase transitions at critical temperatures T_{c1} = 167.5 K and T_{c2} = 214.6 K, respectively.
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Low Temperature Specific Heat of BiOX (X = Cl, Br, and I) Single Crystals

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Bunda V., Bunda S., Kajňakova M., Feher A., Syrkin E., Feodosyev S.
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issue 5
986-987
EN
Low temperature specific heat of layered bismuth oxyhalide crystals has been studied in the temperature range from 2 to 50 K in zero and 8 T magnetic field. The expected Debye-like behaviour at the lowest temperatures (below 4-5 K) is established. Linear dependences of entropy and the Debye temperature as cross-correlation parameters are established. The small values of the Debye temperature and peculiarities of phonon spectra at lowest temperatures are discussed.
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