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M’Peko, Jean-Claude; Portelles, J.; Calderón, Francisco García; Rodríguez, Gabriela Melo

doi:10.1023/a:1017580223934

Cited by 28 publications

(11 citation statements)

References 8 publications

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“…Notice in Fig. 3 that the electrical effect of humidity does not alter the material ferroelectric response, as this effect is resolved only toward higher temperatures where interfacial (grain boundary) phenomena become normally dominant [13,14]. In good agreement with our SEM results, porosity where most humidity will preferably lodge is found to precisely locate at the intergranular regions.…”

Section: Resultssupporting

confidence: 84%

Ferroelectric properties of lanthanum and titanium modified SBN ceramic system

Venet

Garcia

Eiras

et al. 2003

Physica Status Solidi (b)

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The dielectric properties of lanthanum (La) and titanium (Ti) modified SBN ceramics were investigated in this work. The ferroelectric to paraelectric transition temperature is found to be sensitive to the substitution degree of host ions. In particular, high values of permittivity at room temperature and a stable dielectric response in a wide range of temperature, along with low values of dielectric losses, are reported for the solid solution nominally involving the highest lattice vacancies required for electrical neutrality.

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Section: Resultssupporting

confidence: 84%

Ferroelectric properties of lanthanum and titanium modified SBN ceramic system

Venet

Garcia

Eiras

et al. 2003

Physica Status Solidi (b)

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“…3(c)). This latter picture reflects the typical frequency-dispersion characteristics of materials involving conduction processes and barrier effects induced by the material heterogeneities [ [14][15][16], i.e. in these samples should develop a considerable amount of space charge whose contribution becomes measurable especially at high temperatures.…”

Section: Dielectric Properties and Ferroelectric Phase Transition Chamentioning

confidence: 78%

Electrical Properties of Nb-Doped PZT 65/35 Ceramics: Influence of Nb and Excess PbO

et al. 2005

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The effect of Nb and excess PbO on the structural and electrical properties of conventionally prepared Nb-doped PZT 65/35 ceramics has been studied in this work. It is found that, from excess PbO contents as high as 4 mol%, the solubility limit of Nb in PZT occurs below 4 mol%, while a secondary prevoskite-like phase develops in the dielectric system for a further increase of Nb content. The ferroelectric and piezoelectric properties (permittivity, ferro-paraelectric phase transition, polarization, electromechanical coefficients) of such materials are thus found to be strongly dependent on the degree of densification and structural phase development during sintering at high temperatures. In particular, the nature of the ferro-to para-electric phase transition is in these materials noted to better fit a generalized rather than Smolenskii-Isupov equation, the former being appropriate for the characterization of non-purely diffuse transitions. In nice agreement with the Bokov model, substitution of Nb 5+ for (Zr,Ti) 4+ is found to induce only poorly diffuse phase transition in these materials. The electrical properties reported in this work are in magnitude comparable to those exhibited by PZT-based materials.

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“…The possible reason is that there are several different valence ions of Ba 2 þ , Bi 3 þ and some other ions in the A site, which may result in the other donor compensating mechanisms for BT based ceramics. And Bi 3 þ was easy to volatilize during sintering because of its low melting point, so that BT ceramics with different Bi-based compounds were easy to deviate their stoichiometric proportion [7][8][9][10][11][12]. Bismuth deficiency can accelerate the final stages of sintering with Bi and O vacancy concentrations enhancing the solid-state transport mechanisms [13].…”

Section: Resultsmentioning

confidence: 99%