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La-doped and La/Mn-co-doped Barium Titanate Ceramics

100%
Vijatović Petrović M., Bobić J., Grigalaitis R., Stojanović B., Banys J.
Acta Physica Polonica A
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2013
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vol. 124
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issue 1
155-160
EN
Barium titanate ceramics doped with 0.3 mol.% lanthanum and co-doped with 0.3 mol.% lanthanum and 0.05 mol.% manganese were investigated. The powders were prepared by a modified polymeric precursor method based on the Pechini process. The ceramics were obtained by sintering at 1300C for 8 h. The influence of dopants on structural changes and grain size reduction was analyzed. The presence of dopants influenced the tetragonality of the barium titanate crystal structure. Reduction of polygonal grain size with dopant addition was noticed. In the doped ceramics, characteristic phase transitions were shifted to lower temperatures in comparison with pure barium titanate. The dielectric permittivity value showed the tendency of a slight increase with lanthanum addition and further increase with adding of manganese. La as a single dopant increased the diffuseness of phase transitions indicating the formation of a diffuse ferroelectric material but in the co-doped ceramics the phase transition diffuseness decreased. The resistivity of the co-doped ceramics was higher than for lanthanum doped ceramics, indicating possible segregation of manganese at grain boundaries that influenced the total resistivity of the material.
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Terahertz Spectroscopy of Ordered PbSc_{1/2}Nb_{1/2}O_3 Ceramics

73%
Macutkevič J., Adomavičius R., Krotkus A., Valušis G., Grigalaitis R., Banys J., Bormanis K., Sternberg A.
Acta Physica Polonica A
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2008
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vol. 113
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issue 3
883-886
EN
The ordered PbSc_{1/2}Nb_{1/2}O_3 ceramics were studied by THz transmission spectroscopy in the temperature range of 80-300 K. Below ferroelectric phase transition temperature the strength of central mode gradually decreases and gives evidence for a mixed displacive and order-disorder character of the transitions. Ferroelectric phase transition is connected with an abrupt freezing and rise of polar nanoregions into ferroelectric domains.
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