The Global and Local Symmetries of Nanostructured Ferroelectric Relaxor 0.94(Bi0.5Na0.5)TiO3– 0.06BaTiO3

Montero-Cabrera, M. E.; Pardo, L.; García, Álvaro López; Fuentes-Montero, María Elena; Ballinas-Casarrubias, Lourdes; Fuentes-Cobas, L.

doi:10.1080/00150193.2014.948358

Cited by 12 publications

(38 citation statements)

References 46 publications

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“…Such is the case of some BNT-based ceramics even in the unpoled state [11,79,80]. For BNT and BNT-based and other lead-free ferroelectric ceramics, this strategy has been widely used [70,81,82,83,84,85,86,87]. …”

Section: X-ray Diffraction and Scatteringmentioning

confidence: 99%

“…The 1D experiment is more sensitive to surface effects at low Bragg angles, which explains why one might do one or the other depending on if surface effects are the focus of the experiment. In literature, one can find informative studies that carry on Rietveld structural refinement of single conventional or synchrotron X-ray diffraction patterns with flat specimens and coupled θ–2θ scans, of ferroelectrics after the application of electric field [70,73,78,81,82,83,84,85,86,87,88,89]. …”

Section: X-ray Diffraction and Scatteringmentioning

confidence: 99%

“…Alternatively, a Rietveld analysis of synchrotron X-ray diffraction patterns [87] of unpoled BNBT6 ceramics from nanopowders [117] led to the conclusion that the relatively complex structure of h00 peaks of this material involved the coexistence of three components. According to these authors, the analyzed BNBT6 ceramic shows a major cubic Pm- 3 m phase, polar at local level as revealed by XANES, that produces the most intense, sharp perovskite peaks.…”

Section: Case Study: the Bnbt Systemmentioning

confidence: 99%

“…Due to the dielectric relaxor behavior of this BNBT6 ceramic [116], related with the existence of polar nanoregions (PNRs), humps [87] have been associated with PNRs, presumably of local P 4 bm symmetry [87]. PNRs were observed by TEM in BNT6 [110,114] and have been also detected in PLZT, PMN-PT, PZN and PMN by force microscopy [118] and neutron radial function distributions (RFDs) [119].…”

Section: Case Study: the Bnbt Systemmentioning

confidence: 99%

“…To elucidate the applicability of the three phases’ interpretation of the BNBT6 (and close compositions at the MPB) synchrotron XRD patterns [87] as an alternative to the P 4 mm tetragonal symmetry, the nature of the low-angle side humps in BNT-based ceramics [70,78,82,83,84,85,87,121] and single-crystals [122] and their dependence with respect to the main perovskite intense peaks must be clarified.…”

Section: Case Study: the Bnbt Systemmentioning

confidence: 99%

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Ferroelectrics under the Synchrotron Light: A Review

et al. 2015

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Currently, an intensive search for high-performance lead-free ferroelectric materials is taking place. ABO3 perovskites (A = Ba, Bi, Ca, K and Na; B = Fe, Nb, Ti, and Zr) appear as promising candidates. Understanding the structure–function relationship is mandatory, and, in this field, the roles of long- and short-range crystal orders and interactions are decisive. In this review, recent advances in the global and local characterization of ferroelectric materials by synchrotron light diffraction, scattering and absorption are analyzed. Single- and poly-crystal synchrotron diffraction studies allow high-resolution investigations regarding the long-range average position of ions and subtle global symmetry break-downs. Ferroelectric materials, under the action of electric fields, undergo crystal symmetry, crystallite/domain orientation distribution and strain condition transformations. Methodological aspects of monitoring these processes are discussed. Two-dimensional diffraction clarify larger scale ordering: polycrystal texture is measured from the intensities distribution along the Debye rings. Local order is investigated by diffuse scattering (DS) and X-ray absorption fine structure (XAFS) experiments. DS provides information about thermal, chemical and displacive low-dimensional disorders. XAFS investigation of ferroelectrics reveals local B-cation off-centering and oxidation state. This technique has the advantage of being element-selective. Representative reports of the mentioned studies are described.

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Section: X-ray Diffraction and Scatteringmentioning

confidence: 99%

Section: X-ray Diffraction and Scatteringmentioning

confidence: 99%

Section: Case Study: the Bnbt Systemmentioning

confidence: 99%

Section: Case Study: the Bnbt Systemmentioning

confidence: 99%

Section: Case Study: the Bnbt Systemmentioning

confidence: 99%

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Ferroelectrics under the Synchrotron Light: A Review

et al. 2015

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Effect of the sintering technique on the ferroelectric and d33 piezoelectric coefficients of Bi0.5(Na0.84K0.16)0.5TiO3 ceramic

et al. 2019

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In the search of lead-free piezoelectric materials, ceramic processing techniques offer potential tools to increase the piezoelectric and ferroelectric properties in addition to new chemical compositions. Powders of pure BNKT16 (Bi 0.5 (Na 0.84 K 0.16 ) 0.5 TiO 3 ) phase were synthesized by sol-gel method with a low crystallization temperature (750 ℃ ). Ceramic samples were sintered by pressureless sintering (PLS), sinter-forging (SF), and spark plasma sintering (SPS) techniques. Structural, morphological, and chemical characterizations were performed by XRD, Raman, EDS, and SEM. Sintered samples by PLS and SF exhibit rod-like grains associated to bismuth volatility. The highest remanent polarization (11.05 µC/cm 2 ), coercive field (26.2 kV/mm), and piezoelectric coefficient (165 pC/N) were obtained for SF sample. The piezoresponse force microscopy (PFM) analysis shows that the crystallites at the nanoscale exhibit piezoelectric phenomenon and the highest piezoelectric response is reported for PLS sample. The presence of the rhombohedral phase, the increase in grain and crystallite size, and the oriented rod-like inclusions favoring the crystallographic texture are facts that enhance the piezoelectric coefficient for BNKT16 piezoceramics.

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