New materials and processes for the manufacturing of ceramics presenting colossal values of permittivity

Guillemet‐Fritsch, Sophie; Lebey, Thierry; Valdez, Zaira I. Bedolla; Dinculescu, Sorin

doi:10.1109/eptc.2006.342773

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…As a result, barium titanate ceramics doped with lanthanum is the most attractive material from the point of view of potential applications. The colossal values of electrical permittivity, characterizing the ceramics of lanthanum titanate (BLT), are associated with the occurrence of electromechanical coupling [ 2 ]. However, the main attention of researchers is focused at the positive temperature coefficient of resistivity (PTCR) connected with the jump of few order in magnitude of the resistivity in a small temperature range above the ferroeletric–paraelectric transition temperature [ 3 , 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Electrical Properties of BLT Ceramics Modified by Fe Ions

et al. 2020

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The solid solution of the perovskite type structure Ba0.996La0.004Ti1−yFeyO3 (BLTF) for varying iron content (y = 0.1−0.4 mol.%) was obtained as a result of a solid state reaction using the conventional method. At room temperature (Tr < TC), the as-received ceramics reveals a single-phase, tetragonal structure and a P4mm space group. An increase in the iron content causes a slight decrease in the volume of the elementary cell. In addition, this admixture significantly reduces the maximum permittivity value (εm) and the shift of the phase transition temperature (TC) towards lower temperatures. The BLTF solid solution shows a classical phase transition and low values of dielectric loss tangent (tgδ), both at room temperature and in the phase transition area. The Curie–Weiss temperature (T0) and Curie constant (C) were also determined on the basis of the dielectric measurements results. The analysis of temperature changes in DC conductivity revealed presence of the positive temperature coefficient of resistivity (PTCR) effect in the phase transition area.

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Section: Introductionmentioning

confidence: 99%

Dielectric and Electrical Properties of BLT Ceramics Modified by Fe Ions

et al. 2020

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“…The substitution of Fe 3+ ions in place of Ti 4+ ions leads to limitations on the movement of oxygen octahedra [ 15 , 16 ]. The effect thereof may confer a significant possibility to regulate the temperature of the phase transition from the ferroelectric to the paraelectric phase, a substantial increase in the dielectric constant at room temperature ( Tr ), and to obtain the interesting electrical properties of this compound [ 17 , 18 ]. The influence of the lanthanum admixture on the dielectric and electrical properties of BaTiO 3 ceramics has been described in earlier papers [ 19 , 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Fe-Doped Barium Lanthanum Titanate as a Competitor to Other Lead-Free Piezoelectric Ceramics

et al. 2022

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Multiferroic solid solutions of Ba1−xLaxTi1−x/4O3 and iron (BLFT) were synthesized using the conventional mixed oxide method. The dependence of the piezoelectric coefficients on Fe content in BLFT ceramics was determined by the quasi-static and resonance method. The results indicate that 0.3 mol% addition of Fe3+ ions to the ceramic structure increased the value of the piezoelectric parameter d33 to the maximum of 159 pC/N. This puts BLFT ceramics among other good-quality and lead-free piezoelectric ceramics. A major enhancement of dielectric properties related to the manipulation of Fe content in the barium lanthanum titanate (BLT) ceramics system is reported as well.

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“…La 3+ ions, which have ionic radii of 1.17 Å, can be used to substitute for Ba 2+ (with an ionic radius of 1.49 Å) [3,4]. The influence of La 3+ doping on BT properties especially draw our attention, due to its high impact on the value of dielectric constant, which makes these ceramics prospective for many applications, that can take advantage of its parallel huge capacitance [5,6]. Our investigation focused on BLT ceramics, doped with various molar content of lanthanum namely: Ba 1-x La x Ti 1-x/4 O 3 , (BLT ceramics).…”

Section: Introductionmentioning

confidence: 99%

Investigation of La3+ Doping Effect on Piezoelectric Coefficients of BLT Ceramics

Wodecka-Duś

Kozielski

Erhart

et al. 2017

Archives of Metallurgy and Materials

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Effects of La3+ admixture in barium lanthanum titanate (BLT) ceramics system with colossal permittivity on performance of prospective piezoelectric cold plasma application were studied. Usage of cold atmospheric pressure plasma appears promising in terms of industrial and healthcare applications. Performed investigation provide consistent evaluation of doping lanthanum amount on piezoelectric coefficients values with simultaneous capability of charge accumulation for effective plasma generation. Modification of ferroelectric materials with heterovalent ions, however with the lower radii than the original atoms, significantly affects their domain mobility and consequently electromechanical properties. To determine the piezoelectric coefficients, the resonanceantiresonance method was implemented, and values of piezoelectric and dielectric parameters were recorded. Finally the results indicated that addition of 0.4 mol.% of La 3+ ions to the ceramic structure maximally increased the values of piezoelectric coefficient to d 33 = 20 pC/N and to huge dielectric constant to ε 33 T = 29277.

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New materials and processes for the manufacturing of ceramics presenting colossal values of permittivity

Cited by 3 publications

References 9 publications

Dielectric and Electrical Properties of BLT Ceramics Modified by Fe Ions

Dielectric and Electrical Properties of BLT Ceramics Modified by Fe Ions

Fe-Doped Barium Lanthanum Titanate as a Competitor to Other Lead-Free Piezoelectric Ceramics

Investigation of La3+ Doping Effect on Piezoelectric Coefficients of BLT Ceramics

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