Dielectric and ferroelectric properties of lead magnesium niobate–lead zirconate titanate ceramics prepared by mixed-oxide method

Yimnirun, Rattikorn; Ananta, Supon; Laoratanakul, Pitak

doi:10.1016/j.jeurceramsoc.2004.07.026

Cited by 110 publications

(69 citation statements)

References 27 publications

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“…Yimnirun et al [21] have also found that the composition 0.5PZT-0.5PMN had the highest degree of disorder. The author attributed this to the grain size variation [22,23] and the formation of a secondary pyrochlore phase.…”

Section: Dielectric Propertiesmentioning

confidence: 92%

Relaxor behavior of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 ceramics

Song

Zhu

et al. 2009

Sci. Bull.

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Section: Dielectric Propertiesmentioning

confidence: 92%

Relaxor behavior of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 ceramics

Song

Zhu

et al. 2009

Sci. Bull.

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“…The polarization-electric field (P-E) measurements for FeTiTaO 6 at T < T m showed a broad hysteresis curve similar to that of a ferroelectric material but with a large leakage current (Supporting Information). The remnant polarization was typically 1.6 mC cm À2 at 392 K. The dielectric loss (0.4 and 0.6 for 530 and 5106 Hz at room temperature) is significantly higher than that for a typical relaxor [20] like Pb 3 MgNb 2 O 9 (0.001 for 1 kHz at room temperature) but comparable to the value (0.32 for 10 kHz at room temperature) reported for Ca 0.28 Ba 0.72 Nb 2 O 6 crystals. [21] In summary, we have found for the first time a ferroelectric relaxor behavior in rutile FeTiTaO 6 , with a transition temperature T m around 550 K at 530 Hz and a large e 0 value of the order of 5 Â 10 4 at T m .…”

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confidence: 93%

FeTiTaO₆: A Lead‐Free Relaxor Ferroelectric Based on the Rutile Structure

et al. 2008

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Several materials properties of rutile TiO 2 (together with its other polymorphs) have been widely investigated in view of both fundamental and practical interest. It is a wide band gap (E g ¼ 3.05 eV) semiconductor that finds application, among others, as a photocatalyst for splitting water [1] into H 2 and O 2 and remediation of organic pollutants. [2] Among the lesswell-known properties of TiO 2 is its abnormally large static dielectric permittivity that shows strong frequency dependence as well as the associated soft A 2u mode that decreases with decreasing temperature. [3,4] The latter, however, never becomes completely soft, even at 0 K. Accordingly, rutile is classified as an incipient ferroelectric. We prepared M 0 TiTaO 6 (M 0 ¼ Al, Cr, Fe) oxides by conventional solid-state synthesis starting from pure binary oxides. Powder X-ray diffraction (XRD) showed formation of rutile structure for all three M 0 TiTaO 6 compounds. All the reflections in the patterns (Fig. 1) could be indexed to the tetragonal rutile structure. The structural parameters derived from Rietveld refinement of the powder XRD data are given in Table 1. We see that while the c/a ratio remains nearly the same as in the parent rutile TiO 2 , the a and c parameters of M 0 TiTaO 6 show variations that are consistent with the average ionic radii of the metal atoms. We find that the average M-O distances in FeTiTaO 6 are slightly larger than those in rutile, consisting of 4 short and 2 long M-O bonds (elongated MO 6 octahedron); curiously, for M 0 ¼ Al and Cr oxides we find 4 long and 2 short M-O bonds (compressed MO 6 octahedron).We have recorded neutron diffraction (ND) patterns of M 0 ¼ Cr, Fe at T ¼ 300, 150, and 12 K, in an attempt to characterize further the structure of these oxides. We see no evidence for a long-range magnetic ordering down to 12 K in

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“…It is noted that the theoretical density slightly decreases with increasing BZN content into PMNZT60/40. This suggests that either an addition of a large particle size of BZN into the PMNZT60/40 composition or sintering temperature causes a significant decrease in the density of the bulks [15]. As shown in Table 1, the average grain size of all the mixed compositions is more than the PMNZT60/40 material.…”

Section: Powder Characteristics Studiesmentioning

confidence: 92%

“…Cubic pyrochlore phase exists in PMN ceramics prepared by conventional mixed oxide method and the columbite precursor [10,11] that exhibits low dielectric constants. For the PMNZT system in which oxides were mixed together, previous works have only focused on 0.6PMN-0.4PZT (PMNZT60/40) which is one of the materials consisting of morphotropic phase boundary (MPB) [12][13][14][15]. There has been studies on the dielectric and ferroelectric properties of the ceramics within the entire compositional ranges near MPB [16,17].…”

Section: Introductionmentioning

confidence: 99%