Elastic and piezoelectric properties of BaTiO3 at room temperature

Khalal, Ali; Khatib, D.; Jannot, B.

doi:10.1016/s0921-4526(99)00202-1

Cited by 29 publications

(13 citation statements)

References 16 publications

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“…The study confirmed the increase in conductivity under reduction treatment as due to the exponential increase in Cu 2+ defects. Substitution induces a transfer of charges of oxygen towards titanium (partial reduction of titanium) [15]. Chen et al [16] also concluded that Cu doping might be responsible for the metallic behaviour observed in Cu-doped BaTiO 3 .…”

Section: Resultsmentioning

confidence: 99%

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Ferroelectric Phase Transition in Cu-doped BaTiO3 Crystals

Ouedraogo

Palm²,

Chanussot³

2009

J. Sci. Res.

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The paper examines the ferroelectric-paraelectric phase transition in Cu:BaTiO 3 single crystals. Using thermo-currents and dielectric measurements, we found for pure samples the phase transition temperature to be close to Curie temperature (T c =120°C) with an anisotropy of the dielectric constantε.The lowering of temperature T m , corresponding to the maximum of pyroelectric signal, with the increase of concentration of impurities is confirmed by measurements of ε. Moreover, the ε(T) curves show progressive broadening as well as higher peak with the increase of impurity concentration, and the transition becomes more and more diffuse. The same effect occurs when the samples are subjected to a laser irradiation (λ=5145Ǻ). During annealing, crystals lose copper and T m is thereafter observed to increase again. BaTiO 3 is a displacive ferroelectric (having high permittivity k-values) which undergoes a first order phase transition. Ions substitutions have an effect on the lattice dynamics attributed to charge transfer to Ti and a lowering of elastic forces in BaTiO 3 .

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Section: Resultsmentioning

confidence: 99%

“…There is thus an influence of heterovalent substitutions on the dynamics of the lattice and conduction in perovskites [15]. For percentages higher than 0.3%, the determination of concentrations of various ions made it possible to deduce that the most probable site for the Cu 2+ ion is the Ti 4+ site [7].…”

Section: Resultsmentioning

confidence: 99%

Ferroelectric Phase Transition in Cu-doped BaTiO3 Crystals

Ouedraogo

Palm²,

Chanussot³

2009

J. Sci. Res.

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“…The distortion tends to be larger if the ions involved have higher polarizability. Furthermore, a highly anisotropic polarizability leads to changes in the phononic spectrum of the crystal that favor large vibrations and in turn high piezoelectric coefficients 88,89 Figure 9. shows possible candidates for A, B, and oxygen sites in perovskite‐type structures; Fig.…”

Section: General Considerationsmentioning

confidence: 99%

Perspective on the Development of Lead‐free Piezoceramics

Rödel

Seifert

et al. 2009

Journal of the American Ceramic Society

2,716

1,573

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A large body of work has been reported in the last 5 years on the development of lead-free piezoceramics in the quest to replace lead-zirconate-titanate (PZT) as the main material for electromechanical devices such as actuators, sensors, and transducers. In specific but narrow application ranges the new materials appear adequate, but are not yet suited to replace PZT on a broader basis. In this paper, general guidelines for the development of lead-free piezoelectric ceramics are presented. Suitable chemical elements are selected first on the basis of cost and toxicity as well as ionic polarizability. Different crystal structures with these elements are then considered based on simple concepts, and a variety of phase diagrams are described with attractive morphotropic phase boundaries, yielding good piezoelectric properties. Finally, lessons from density functional theory are reviewed and used to adjust our understanding based on the simpler concepts. Equipped with these guidelines ranging from atom to phase diagram, the current development stage in lead-free piezoceramics is then critically assessed.

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“…The second-order elastic constants may be computed with different techniques. Molecular dynamics [15] and ab initio computational techniques are two prominent methods to compute the elastic constants and bulk modulus. The ab initio computational techniques compute the second-order elastic constant (SOEC) from the total energy.…”

Section: Calculation Of Elastic Constants With the Crystal09 Codementioning

confidence: 99%