scholarly journals Resolving the characteristics of morphotropic phase boundary in the (1−x)Pb(Fe1/2Nb1/2)O3–xPbTiO3 system: A combined dielectric and synchrotron x-ray diffraction study

2008 ◽  
Vol 93 (18) ◽  
pp. 182910 ◽  
Author(s):  
Satendra Pal Singh ◽  
Dhananjai Pandey ◽  
Songhak Yoon ◽  
Sunggi Baik ◽  
Namsoo Shin
Keyword(s):  
Phase Boundary ◽  
Diffraction Study ◽  
Morphotropic Phase Boundary ◽  
X Ray Diffraction ◽  
X Ray ◽  
System A

Phase Diagram of the W-doped Pb(Zn1/3Nb2/3)O3–BaTiO3– PbTiO3 System Around a Morphotropic Phase Boundary Composition

2002 ◽  
Vol 17 (5) ◽  
pp. 1085-1091 ◽  
Author(s):  
W. Z. Zhu ◽  
M. Yan ◽  
A. L. Kholkin ◽  
P. Q. Mantas ◽  
J. L. Baptista
Keyword(s):  
High Temperature ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electrical Neutrality ◽  
Phase Boundary Composition ◽  
A Site ◽  
Successive Phase

The morphotropic phase boundary (MPB) composition that is characterized by the coexistence of rhombohedral and tetragonal phases in the Pb(Zn1/3Nb2/3)O3–BaTiO3– PbTiO3 system was modified by W-doping at the B site of a perovskite structural block. To maintain the electrical neutrality, creation of A-site vacancies was intentionally introduced in the formulation of the examined compositions. Incorporation of W ions was revealed to stabilize the tetragonal phase against the rhombohedral one, shifting the MPB toward the PZN-rich end at room temperature. High-temperature x-ray diffraction examination in combination with dielectric measurements discloses two successive phase transitions as a sample is cooled from high temperature, namely, paraelectric cubic to ferroelectric rhombohedral followed by ferroelectric rhombohedral to ferroelectric tetragonal. W addition appears to suppress the first transition while promoting the second one.

Microstructure and electrical properties of 0.5PZN-0.5PZT relaxor ferroelectrics close to the morphotropic phase boundary

2009 ◽  
Vol 24 (6) ◽  
pp. 2029-2034 ◽  
Author(s):  
Lu-Yang Zhao ◽  
Yu-Dong Hou ◽  
Li-Min Chang ◽  
Man-Kang Zhu ◽  
Hui Yan
Keyword(s):  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Oxygen Vacancies ◽  
Rhombohedral Phase ◽  
Relaxor Ferroelectrics ◽  
Arrhenius Law ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Mixing Method

Relaxor ferroelectrics of Pb(Zn1/3Nb2/3)0.5(Zr0.47Ti0.53)0.5O3 (0.5PZN-0.5PZT) were prepared using the conventional oxide mixing method. Both x-ray diffraction analysis and Raman spectroscopy indicate that the amounts of rhombohedral phase are close to tetragonal phase, implying the presence of the morphotropic phase boundary (MPB) in the system of 0.5PZN-0.5PZT, and this result was further confirmed by transmission electron microscopy (TEM) micrographs. At MPB composition, the excellent piezoelectric properties, such as kp (0.66) and d33 (425pC/N), were obtained due to the more possible polarization directions of domains and high dc resistivity of 6.5 × 1010 Ω·cm. Meanwhile, the dielectric studies revealed that the indicator of the degree of diffuseness γ value is 1.73, implying that the relaxor nature of the 0.5PZN-0.5PZT is ceramic. The activation energy related to the dc conductivity was estimated from a linear fitting of the Arrhenius law. The value of 0.09 and 1.04 eV for low and high temperature range corresponds well to the activation energies of migration and first ionization of the oxygen vacancies.

scholarly journals Combustion synthesis in the Ni–Al–Nb ternary system: A Time-Resolved X-ray Diffraction study

2017 ◽  
Vol 7 ◽  
pp. 1878-1882 ◽  
Author(s):  
Alexander E. Sytschev ◽  
Dmitry Yu. Kovalev ◽  
Dominique Vrel ◽  
Sergey G. Vadchenko
Keyword(s):  
Ternary System ◽  
Diffraction Study ◽  
Combustion Synthesis ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
System A

Dielectric properties anomaly of (1−x)Pb(Ni1/3Nb2/3)O3−xPbTiO3 ceramics near the morphotropic phase boundary

2001 ◽  
Vol 16 (3) ◽  
pp. 834-836 ◽  
Author(s):  
Zhenrong Li ◽  
Liangying Zhang ◽  
Xi Yao
Keyword(s):  
Dielectric Properties ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Composition Range ◽  
The Other ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
Structure Defects ◽  
X Ray ◽  
Dielectric Peak

Dielectric properties and the phase compositions of (1−x)Pb(Ni1/3Nb2/3)O3−xPbTiO3 ceramics were investigated. A morphotropic phase boundary (MPB) in the system between pseudocubic and tetragonal phase regions has been identified to lie in the composition range x = 0.34–0.38 by means of x-ray diffraction and dielectric measurements. The samples of composition lying near the MPB have good dielectric properties, but at the same time, exhibit two dielectric peaks. The possible reasons for the occurrence of dielectric bipeaks are discussed. One dielectric peak is phase transition peak, and the other peak lying in 130–150 °C temperature range is suggested to result from structure defects in the ceramics.

Dielectric and Piezoelectric Properties of Gd-modified (1-x) BiFeO3-xPbTiO3 Ceramics with a Morphotropic Phase Boundary

2013 ◽  
Vol 1507 ◽  
Author(s):  
Dalei Wang ◽  
Shundong Bu ◽  
Guoxi Jin ◽  
RuiDai ◽  
Dengren Jin ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Composition Range ◽  
Piezoelectric Properties ◽  
X Ray Diffraction ◽  
Wide Composition Range ◽  
X Ray ◽  
Dielectric Constant And Loss ◽  
Dielectric And Piezoelectric Properties

ABSTRACT(1-x)(Bi0.8Gd0.2)FeO3-xPbTiO3 (BGF-PT) solid solutions ceramics of x=0.55,0.50,0.4975, 0.49 and 0.45 were prepared by the mixed oxide method. Gd3+ of 20 at% was introduced into the Bi3+ site to improve the dielectric and piezoelectric properties of BFPT without causing the significant reduction of Curie temperature (Tc). X-ray diffraction analysis shows a transformation from the tetragonal (T) to rhombohedral (R) phase with the increase of BGF content. The morphotropic phase boundary was determined by measuring the dielectric and piezoelectric properties of BGF-PT within a wide composition range. BGF-PT for x=0.4975 shows the coexistence of T and R phases with the dielectric constant and loss of about 895 and 0.031 respectively at the frequency of 102 Hz.

scholarly journals Structural and electromechanical study of Bi0.5Na0.5TiO3-BaTiO3 solid-solutions

2013 ◽  
Vol 7 (2) ◽  
pp. 73-80 ◽  
Author(s):  
Biswanath Parija ◽  
Tanmaya Badapanda ◽  
Pratap Sahoo ◽  
Manoranjan Kar ◽  
Pawan Kumar ◽  
...  
Keyword(s):  
Solid Solution ◽  
Raman Spectroscopy ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Solid Solutions ◽  
Structural Changes ◽  
Boundary Region ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray

Solid solution of (1-x)Bi0.5Na0.5TiO3-xBaTiO3 have been synthesized via conventional solid-state reaction route. Structural changes of the solid-solutions were investigated by using X-ray diffraction, Rietveld refinement Raman spectroscopy and piezoelectric studies. X-ray diffraction analysis shows a distinct 002/200 peak splitting appearing at x = 0.07 showing the coexistence of rhombohedral and tetragonal phase. Raman spectroscopy shows a splitting of (TO3) mode at x = 0.07 confirming the presence of the morphotropic phase boundary region. The dominant bands in the Raman spectra are analyzed by observing the changes in their respective peak positions, widths and intensities as the x increases. The piezoelectric properties of the solid solution increase with rise in BaTiO3 content and shows optimum value at x = 0.07 owing to the co-existence of two ferroelectric phases. Based on these results, it is suggested that the morphotropic phase boundary in the studied system lies in the composition x = 0.07.

Stability of the Perovskite Structure in BSPT-Based Ferroelectric Ceramics

2007 ◽  
Vol 336-338 ◽  
pp. 231-234
Author(s):  
Yi Chen ◽  
De Jun Lan ◽  
Qiang Chen ◽  
Ding Quan Xiao ◽  
Xi Yue ◽  
...  
Keyword(s):  
Solid State ◽  
Diffraction Analysis ◽  
Phase Boundary ◽  
Morphotropic Phase Boundary ◽  
Perovskite Structure ◽  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
X Ray ◽  
State Process ◽  
The Stability

(1-x)BiScO3-xPbTiO3 (BSPT) based ferroelectric ceramics were prepared by conventional solid state process. X-ray diffraction analysis revealed that the morphotropic phase boundary (MPB) separating the rhombohedral and tetragonal phases for the BSPT system exited near x=0.62. It was found that the stability of perovskite structure of the BSPT system was improved with the increase of PbTiO3 content. For the 0.36BiScO3-0.64Pb1-ySryTiO3 (BSPST) system, because of higher amount of ionic bonding, the stability of perovskite structure for BSPT compounds containing strontium is larger than that of non-strontium compound.

Ion‐beam mixing in an Al‐Fe‐Mn system: A conversion‐electron Mössbauer and x‐ray diffraction study

1990 ◽  
Vol 67 (2) ◽  
pp. 710-714 ◽  
Author(s):  
S. N. Yedave ◽  
S. M. Chaudhari ◽  
S. M. Kanetkar ◽  
S. B. Ogale ◽  
S. V. Ghaisas
Keyword(s):  
Diffraction Study ◽  
Conversion Electron ◽  
Ion Beam ◽  
X Ray Diffraction ◽  
Ion Beam Mixing ◽  
X Ray ◽  
System A
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