Lead titanate zirconate — based pyroelectric ceramics

Hardiman, B.; Kiehl, K. V.; Reeves, C. P.; Zeyfang, R. R.

doi:10.1016/0390-5519(78)90094-7

Cited by 6 publications

(1 citation statement)

References 20 publications

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“…The substitution of Nb 5+ for Zr 4+ or Ti 4+ is the most likely cause 22,23 of the increase in lead vacancies. It is well known that defects such as Pb and O vacancies are also created during the growth of pure PZT because of PbO sublimation.…”

Section: Resultsmentioning

confidence: 99%

High-temperature macroscopic piezoelectricity in Nb-dopedPbZr1−xTixO3ceramics driven

et al. 2006

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The dielectric, elastic, and piezoelectric properties of a niobium-doped PbZr 1−x Ti x O 3 ceramic with a composition located near the morphotropic phase boundary have been studied from 25 to 400°C. A strong softening of the elastic coefficients was observed far below the temperature corresponding to the dielectric permittivity maximum, T max = 366°C. The steep decrease of the stiffness coefficient c 44 from 400 to 350°C is probably a stepwise anomaly which is expected at an improper ferroelastic transition. In addition, it was found that all macroscopic piezoelectric activity had disappeared well above T max . This is explained by the combined effects of compositional fluctuations in the Zr/ Ti sublattice and the presence of polar nanoregions. The elastic properties have an anomaly at the temperature at which the lattice becomes predominantly centrosymmetric. The piezoelectric activity vanishes when the polar nanoregions reach a critical size below which they can no longer interact coherently through the nonpolar matrix to induce a macroscopic piezoelectric response.

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Section: Resultsmentioning

confidence: 99%

High-temperature macroscopic piezoelectricity in Nb-dopedPbZr1−xTixO3ceramics driven

et al. 2006

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Perovskite-type titanate zirconate as photocatalyst for textile wastewater treatment

Ferrari

Ueda

Bergamo

et al. 2016

Environ Sci Pollut Res

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Calcium titanate zirconate, Ca(TiZr)O (CZT), powders have been synthesised by the polymeric precursor method. The structural analysis of the CZT powders was monitored by X-ray diffraction (XRD), photoacoustic spectroscopy (PAS) and textural analysis. The photocatalytic properties were evaluated by methylene blue (MB) decomposition and real textile wastewater (RTW) combined treatment (coagulation/flocculation/photocatalysis). Chemical oxygen demand (COD) of RTW was successfully reduced from 6195 mg L (untreated) to 662 mg L after coagulation/flocculation with a tannin-based coagulant (Tanfloc®) and finally to 471 mg L after combined treatment (coagulation/flocculation/photocatalysis) applying ultraviolet radiation and CaTiO as photocatalyst.

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