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Dielectric and Pyroelectric Studies on [N(CH_{3})_{4}]_{3}Bi_{2}X_{9} (X = Cl, Br)

100%

Jakubas R., Bator G., Mróz J.

Acta Physica Polonica A

1995

vol. 87

issue 3

663-669

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.

Structure and Vibrational Spectra of 1,3,5-Trimethoxybenzene

100%

Pawlukojć A., Bator G., Sobczyk L.

Acta Physica Polonica A

2007

vol. 112

issue S

S-171-S-181

Inelastic neutron scattering infrared and Raman spectra of the crystalline 1,3,5-trimethoxybenzene were measured and compared with simulated ones by using the Gaussian 98 and DMol3 programs at density functional theory methods. Application of the double numerical plus polarization basis set for the crystalline state within the local density Perdew and Wang (PWC functionals) approximation quite well reproduces the low frequency bands related to the methyl group librational modes, which are very sensitive to molecular interactions. Infrared spectra for the crystalline sample and CCl_4 solution show spectacularly the change of low frequency modes by going from the symmetric D_{3h} molecules in the gas phase to asymmetric ones in the crystal.

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2 Acta Physica Polonica A

1 2007

1 1995

2 Bator G.

1 Jakubas R.

1 Mróz J.

1 Pawlukojć A.

1 Sobczyk L.

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Dielectric and Pyroelectric Studies on [N(CH_{3})_{4}]_{3}Bi_{2}X_{9} (X = Cl, Br)

Structure and Vibrational Spectra of 1,3,5-Trimethoxybenzene