Photorefractive properties of tungsten bronze ferroelectric lead barium niobate (Pb1−xBaxNb2O6) crystals

1998 ◽  
Vol 83 (11) ◽  
pp. 5967-5972 ◽  
Author(s):  
Myeongkyu Lee ◽  
Robert S. Feigelson ◽  
Alice Liu ◽  
Lambertus Hesselink
Keyword(s):  
Tungsten Bronze ◽  
Lead Barium Niobate

Processing and electrical properties of Pb0.6Ba0.4Nb2O6 ceramics

2010 ◽  
Vol 25 (11) ◽  
pp. 2143-2149 ◽  
Author(s):  
Sinan Dursun ◽  
Cihangir Duran
Keyword(s):  
Electrical Properties ◽  
Single Phase ◽  
Powder Processing ◽  
Ferroelectric Properties ◽  
Tape Casting ◽  
Tungsten Bronze ◽  
Liquid Phase Sintering ◽  
Boundary Phase ◽  
Lead Barium Niobate ◽  
Reactive Mixture

Lead barium niobate (PBN or PbxBa1–xNb2O6) is a promising tungsten bronze ceramic system that has a morphotropic phase boundary between the orthorhombic and tetragonal phases at x ≈ 0.63, where the spontaneous polarization (Ps ≈ 60–70 μC/cm2) and other ferroelectric properties are known to be higher. However, even textured PBN60 ceramics have low Ps (∼23.9 μC/cm2) and piezoelectric charge coefficient (d33 ≈ 236 pC/N) as compared to the single crystal counterparts. The aim of this study is to control powder processing, green body formation, and sintering conditions to enhance both densification and electrical properties. Therefore, samples were prepared by tape casting methods using single phase PBN60 and reactive mixture of PbNb2O6 and BaNb2O6 powders. Three wt% excess PbO was found to be necessary for densification. Our results showed that undoped PBN60 ceramics reached Ps = 33 μC/cm2, d33 = 305 pC/N, and had a Tc = 340–350 °C. These results are much higher than the reported values in the literature, which can be attributed to the careful ceramic processing such as tape casting (e.g., homogenous green structure), annealing (e.g., control of excess grain boundary phase), and liquid phase sintering (e.g., higher densification).

Dielectric properties of tungsten bronze lead barium niobate partially substituted by tantalum

1997 ◽  
Vol 195 (1) ◽  
pp. 11-14
Author(s):  
Xiaoyue Xiao ◽  
Zhilun Gui ◽  
Longtu Li ◽  
Xiaowen Zhang
Keyword(s):  
Dielectric Properties ◽  
Tungsten Bronze ◽  
Lead Barium Niobate

Microstructure-property relations in tungsten bronze lead barium niobate, Pb1−xBaxNb2O6

1991 ◽  
Vol 6 (8) ◽  
pp. 1720-1728 ◽  
Author(s):  
C.A. Randall ◽  
R. Guo ◽  
A.S. Bhalla ◽  
L.E. Cross
Keyword(s):  
Paraelectric Phase ◽  
Structural Phase ◽  
Tungsten Bronze ◽  
Ferroelectric Domain ◽  
Structural Phase Transitions ◽  
Property Relations ◽  
Domain Structures ◽  
Transmission Electron ◽  
Lead Barium Niobate ◽  
Lock In

Transmission electron microscopy (TEM) has been used to explore details of the structural phase transitions and corresponding microstructural features in the solid solution of Pb1−xBaxNb2O6 (PBN) tungsten bronze ferroelectrics at compositions embracing the morphotropic phase boundary between orthorhombic and tetragonal ferroelectric phases. In addition to the ferroelectric domain structures that were consistent with the expected symmetries, incommensurate ferroelastic phases were observed. The “onset” and “lock-in” transition temperatures are a function of the Pb/Ba ratio, and for lead-rich compositions it appears that the incommensurate distortion may occur above the ferroelectric Curie temperature in the paraelectric phase.

Study on Relaxor Ferroelectric Thin Films of Tungsten Bronze Pb1-xBaxNb2O6 by RF Magnetron Sputtering

1997 ◽  
Vol 472 ◽  
Author(s):  
X. Xiao ◽  
N. Xu ◽  
L. Li
Keyword(s):  
Thin Films ◽  
Magnetron Sputtering ◽  
Ferroelectric Properties ◽  
Tungsten Bronze ◽  
Orthorhombic Phase ◽  
Rf Magnetron Sputtering ◽  
Ferroelectric Thin Films ◽  
Sputtering Deposition ◽  
Excess Amount ◽  
Lead Barium Niobate

ABSTRACTFerroelectric thin films of tungsten bronze lead barium niobáte (PBN) were fabricated by radio frequency magnetron sputtering. Oriented growths of the thin films were observed along (001) in tetragonal phase and along (002) in orthorhombic phase. Excess amount of PbO (6 wt %) in the PBN targets were used to compensate Pb evaporation during sputtering deposition. Ferroelectric properties were investigated as a function of annealing temperatures. The thin film with high quality was annealed at 650 °C, while its remnant polarization (Pr) and coercive field (Ec) were equal to 47.9 μC/cm2 and 5.2 kV/cm, respectively.

Ferroelectric properties of tetragonal lead barium niobate (Pb1−xBaxNb2O6) crystals near the morphotropic phase boundary

1998 ◽  
Vol 13 (5) ◽  
pp. 1345-1350 ◽  
Author(s):  
Myeongkyu Lee ◽  
Robert S. Feigelson
Keyword(s):  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Ferroelectric Properties ◽  
Tungsten Bronze ◽  
Domain Size ◽  
Polar Axis ◽  
Domain Structures ◽  
Lead Barium Niobate ◽  
Vertical Bridgman ◽  
Curie Temperatures

Tungsten bronze ferroelectrics with a morphotropic phase boundary (MPB) have become increasingly important for a variety of applications because of their enhanced and unique properties near the MPB. Lead barium niobate (Pb1−xBaxNb2O6) crystals, which have a morphotropic phase boundary between the orthorhombic (1 − x > ∼0.63) and tetragonal (1 − x, <, 0.63) phases, were grown in sealed Pt crucibles by the vertical Bridgman method for tetragonal compositions near the MPB, and their ferroelectric properties were investigated. The ferroelectric domain structures in as-grown crystals were revealed either by etching in hydrofluoric acid or by polishing with colloidal silica, the latter providing clearer features. Domain size on the surface perpendicular to the polar axis was 10–50 μm. Crystals could be poled by slowly cooling from above the Curie temperatures (300–400 °C) under a dc field of 5 V/mm. The spontaneous polarization Ps of tetragonal Pb1−xBaxNb2O6 was found to be in the range of 0.40–0.70 μC/mm2 at room temperature depending on composition and increased as the composition approached morphotropic phase boundary (1 − x = ∼0.63), as expected.

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