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

• Authors: M. Vijatović Petrović , J. Bobić , R. Grigalaitis , B. Stojanović , J. Banys
• Languages of publication: EN

Abstracts

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.

Keywords

EN

81.20.Ka; 81.40.Ef; 77.80.B-; 72.20.-i; 84.37.+q

Discipline

• 77.80.B-: Phase transitions and Curie point(for Curie point in ferromagnetic materials, see 75.30.Kz)
• 81.40.Ef: Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization
• 84.37.+q: Measurements in electric variables (including voltage, current, resistance, capacitance, inductance, impedance, and admittance, etc.)
• 81.20.Ka: Chemical synthesis; combustion synthesis(for electrochemical synthesis, see 82.45.Aa)
• 72.20.-i: Conductivity phenomena in semiconductors and insulators(see also 66.70.-f Nonelectronic thermal conduction and heat-pulse propagation in solids; thermal waves)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2013
• Volume: 124
• Issue: 1
• Pages: 155-160

Dates

published

2013-07

received

2012-11-27

(unknown)

2013-03-27

Contributors

author

M. Vijatović Petrović

• Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, Belgrade, Serbia

author

J. Bobić

• Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, Belgrade, Serbia

author

R. Grigalaitis

• Faculty of Physics, Vilnius University, Sauletekio al. 9, Vilnius, Lithuania

author

B. Stojanović

• Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, Belgrade, Serbia

author

J. Banys

• Faculty of Physics, Vilnius University, Sauletekio al. 9, Vilnius, Lithuania

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Identifiers

DOI

10.12693/APhysPolA.124.155