scholarly journals Phase diagram and dielectric properties of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 ceramics

2015 ◽  
Vol 05 (02) ◽  
pp. 1550014 ◽  
Author(s):  
Dabin Lin ◽  
Haohua Chen ◽  
Zhenrong Li ◽  
Zhuo Xu
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Pbtio3 Ceramics ◽  
Curie Temperatures ◽  
Columbite Precursor ◽  
Tetragonal Phase Transition

x Pb ( In 1/2 Nb 1/2) O 3- Pb ( Mg 1/3 Nb 2/3) O 3- PbTiO 3(x PIN –y PMN –z PT ) ternary ceramics with morphotropic phase boundary (MPB) composition were synthesized by columbite precursor method. x PIN –y PMN –z PT phase diagram was investigated by x-ray diffraction and dielectric measurements. According to the results of dielectric measurements, the Curie temperatures (Tc) and rhombohedral to tetragonal phase transition temperature (Tr−t) were found to be in the range of 173–212°C and 114–155°C, respectively, indicating that the Tr-t was increased with adding PIN component. In the MPB region, the highest Tr-t = 155° C was found in 0.32PIN–0.38PMN–0.30PT ceramic, that greatly expanded temperature usage range.

High Curie temperature perovskite BiInO3–PbTiO3 ceramics

2004 ◽  
Vol 19 (7) ◽  
pp. 2185-2193 ◽  
Author(s):  
Runrun Duan ◽  
Robert F. Speyer ◽  
Edward Alberta ◽  
Thomas R. Shrout
Keyword(s):  
Curie Temperature ◽  
Sol Gel ◽  
High Curie Temperature ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
Compound Formation ◽  
X Ray ◽  
Oxide Powders ◽  
Phase Pure ◽  
Pbtio3 Ceramics

The extent of BiInO3 substitution in the perovskite system xBiInO3–(1 - x)PbTiO3 and the corresponding raise in the Curie temperature were investigated using thermal analysis, dielectric measurements, x-ray diffraction, and electron microscopy. Maximum tetragonal perovskite distortion (c/a = 1.082) was obtained for x = 0.20, with a corresponding Curie temperature of 582 °C. Phase-pure tetragonal perovskite was obtained for x ⩽ 0.25. Compound formation after calcining mixed oxide powders resulted in agglomerated cube-shaped tetragonal perovskite particles, which could be fired to 94.7% of theoretical density (TD). Sol-gel fabrication resulted in nano-sized tetragonal or pseudo-cubic perovskite particles, which after two-step firing, resulted in a tetragonal perovskite microstructure at as high as (x = 0.20) 98.1% of TD.

TWO-PHASE NUCLEI IN PARAELECTRIC PHASE OF Pb1-x(Li1/2La1/2)x(Zr1-yTiy)O3 SOLID SOLUTIONS

2001 ◽  
Vol 15 (24n25) ◽  
pp. 3366-3368
Author(s):  
V. L. SOBOLEV ◽  
V. M. ISHCHUK
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Paraelectric Phase ◽  
Temperature Phase ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Ordered Phases ◽  
Ti Content ◽  
Temperature Phase Diagram

The phase transition from the paraelectric phase to ordered phases in Pb1-x(Li1/2La1/2)x(Zr1-yTiy)O3 with compositions close to the ferroelectric - antiferroelectric - paraelectric triple point in the Ti-content - temperature phase diagram is studied. X-ray diffraction is used to identify two - phase (antiferroelectric and ferroelectric) nuclei embeded in a paraelectric matrix. The relation between these two-phase nuclei in paraelectric phase and the diffuseness of the phase transition is discussed.

Variable temperature and high-pressure crystal chemistry of perovskite formamidinium lead iodide: a single crystal X-ray diffraction and computational study

2017 ◽  
Vol 53 (54) ◽  
pp. 7537-7540 ◽  
Author(s):  
Shijing Sun ◽  
Zeyu Deng ◽  
Yue Wu ◽  
Fengxia Wei ◽  
Furkan Halis Isikgor ◽  
...  
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Low Temperature ◽  
Tetragonal Phase ◽  
Computational Study ◽  
Variable Temperature ◽  
X Ray Diffraction ◽  
Lead Iodide ◽  
X Ray ◽  
Tetragonal Phase Transition

Single crystals of [(NH2)2CH]PbI3 undergo a cubic-to-tetragonal phase transition at low temperature and high pressure.

Study of the structure and dielectric relaxation behavior of Pb(Mg1/3Nb2/3)O3–PbTiO3 ferroelectric ceramics

1999 ◽  
Vol 14 (12) ◽  
pp. 4581-4586 ◽  
Author(s):  
Xiaowen Zhang ◽  
Fei Fang
Keyword(s):  
Phase Boundary ◽  
Phase Region ◽  
Dielectric Behavior ◽  
Ferroelectric Ceramics ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
Two Phase ◽  
X Ray ◽  
Dielectric Relaxation Behavior ◽  
Columbite Precursor

(1–x)PMN–xPT[PMN, Pb(Mg1/3Nb2/3)O3; PT, PbTiO3] system ferroelectric ceramics with x = 0.30, 0.33, 0.35, and 0.38 were synthesized by the columbite precursor method. Their structure and dielectric behavior were investigated. X-ray diffraction results demonstrate that no two-phase region is presented, but a quasi-cubic to tetragonal phase boundary lies between x = 0.30 and 0.33. Examination of the dielectric behavior reveals that the transformation from relaxor to normal ferroelectric behavior across the morphotropic phase boundary (MPB) is successive and continuous. It is suggested that x 4 0.30 to 0.33 is the composition of MPB for the PMN–PT system. The MPB is also a boundary for the PMN–PT system to transform from relaxor to normal ferroelectrics.

X-ray diffraction study revealing phase coexistence in barium titanate stannate

2004 ◽  
Vol 19 (10) ◽  
pp. 2834-2840 ◽  
Author(s):  
Volkmar Mueller ◽  
Horst Beige ◽  
Hans-Peter Abicht ◽  
Christian Eisenschmidt
Keyword(s):  
Phase Transition ◽  
Ferroelectric Phase ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Temperature Range ◽  
Xrd Study ◽  
Xrd Patterns ◽  
Tetragonal Phase Transition

In this paper, the results of a temperature dependent x-ray diffraction (XRD) study on BaTi0.95Sn0.05O3 (BTS-5) ceramics are compared with dielectric measurements. The orthorhombic-tetragonal phase transition at T2 = 306 K is found to proceed in a considerably wider temperature range than expected from the dielectric anomaly. Although the macroscopic properties of BTS-5 indicate a rather sharp ferroelectric phase transition at Tc = 358K, we observe anomalous XRD-patterns in a 25 K wide temperature range. This is interpreted in terms of mechanically clamped tetragonal and cubic phase, coexisting in the vicinity of Tc in grains with inhomogeneous Sn-distribution.

In situ X-ray diffraction analysis of Pb(Zr0.52Ti0.48)O3 phase transition in CoFe2O4/Pb(Zr0.52Ti0.48)O3 2-2-type bilayer films

2010 ◽  
Vol 25 (S1) ◽  
pp. S45-S47
Author(s):  
Ji-Ning Wang ◽  
Wei-Li Li ◽  
Xiao-Liang Li ◽  
W. D. Fei
Keyword(s):  
Phase Transition ◽  
Diffraction Analysis ◽  
Magnetoelectric Effect ◽  
Bilayer Film ◽  
X Ray Diffraction ◽  
Si Substrate ◽  
X Ray ◽  
Bilayer Films ◽  
Tetragonal Phase Transition

A 2-2-type nanostructure bilayer film of CoFe2O4/Pb(Zr0.52Ti0.48)O3 was successfully prepared on the (111)Pt/Ti/SiO2/Si substrate. The Pb(Zr0.52Ti0.48)O3 layer in the bilayer film is (111) oriented and is a mixture of tetragonal and monoclinic phases. The results from an in situ X-ray diffraction analysis of the multiferroic bilayer film under statistic magnetic field indicate that the monoclinic-tetragonal phase transition was induced by magnetostriction of the CoFe2O4 layer. A large magnetoelectric effect was obtained probably because of the different polarization directions of the tetragonal and monoclinic phases.

Phase transitions in KTP isostructures: correlation between structure and T c in germanium-doped RbTiOPO4

2003 ◽  
Vol 59 (5) ◽  
pp. 588-595 ◽  
Author(s):  
Stefan T. Norberg ◽  
Joacim Gustafsson ◽  
Bengt-Erik Mellander
Keyword(s):  
Phase Transition ◽  
Transition Temperature ◽  
Room Temperature ◽  
Dielectric Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Distorted Octahedral Coordination ◽  
Distorted Octahedral ◽  
The Relationship ◽  
Germanium Concentration

Crystals of germanium-doped rubidium titanyl phosphate, Rb2(Ti)(Ge0.121Ti0.879)O2(PO4)2 (GeRTP#1) and Rb2(Ge0.125Ti0.875)(Ge0.225Ti0.775)O2(PO4)2 (GeRTP#2), have been structurally characterized from X-ray diffraction data at room temperature. In addition, a third structure, Rb2(TiO)2(PO4)2 (RTP), has been reinvestigated. The exchange of titanium for germanium results in a less distorted octahedral coordination around the two crystallographically independent titanium sites. Additionally, rubidium split-cation positions have been found in these doped RTP crystals. Dielectric measurements show that the phase-transition temperature, T c , decreases with increasing germanium concentration, and a direct correlation between the room-temperature split of the rubidium cations and T c has been discovered. General trends regarding the relationship between the room-temperature structures of KTP-like compounds and their T c values are discussed.

Phase Diagram of the Orientationally Order-disorder Binary System 2,2-dimethyl-1,3-propanediol / 2,2-dimethyl-1,3-diaminopropane, [(CH3)2 C(CH2OH)2]x [(CH3)2C(CH2NH2)2]1-x · A Thermodynamic, X-ray, and 1H-NMR study

1996 ◽  
Vol 51 (7) ◽  
pp. 871-881 ◽  
Author(s):  
Roman Strauss ◽  
Sigmar Braun ◽  
Shi-qi Dou ◽  
Hartmut Fuess ◽  
Alarich Weiss
Keyword(s):  
Phase Transition ◽  
Phase Diagram ◽  
Binary System ◽  
Phase I ◽  
1H Nmr ◽  
Room Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lattice Constants ◽  
H Nmr

AbstractThe phase diagram of the binary system [2,2-dimethyl-1,3-propanediol]x (1) / [2,2-dimethyl-1,3- diaminopropane]1-x (2) was studied by X-ray diffraction and DTA/DSC, for (2) also by 1H-NMR. The system is miscible over the whole concentration range 0 ≤ x ≤ 1 in the liquid state and in the plastic solid state, phase I, just below the melting point. At lower temperatures the system is demixing, and at room temperature two plastic mixed crystals coexist. The plastic phases of (1), (2), and (l)x(2)1-x crystallize face centered cubic, Fm3m, Z = 4, the lattice constants decreasing linearely with increasing x, and the lattice constants are: (1) a(327K) = 880.3 pm , (2) a(243K) = 905.6 pm. By single crystal X-ray diffraction the structure of the ordered phase II of (1) was refined at room temperature, monoclinic, P21/n, Z = 4, a = 596.9 pm, b = 1090.2 pm, c = 1011.0 pm, β = 99.74°. The results are in good agreement with the literature. The phase transition temperatures (in Kelvin) are T1→m = 399.2, TMm→1 = 399.7, T11→1 = 316.2, T1→11 = 308.2 for (1); = 300.2, = 301.7, T11→1 = 228.7, T1→n = 194.2 for (2). Strong hysteresis is observed for the transition T1→11 in (2). In the mixed systems (1)x(2)1-x, 0 < x < 1, the disordered phases do not order even by quenching to liquid nitrogen temperature. High resolution 1 H-NMR measurements are reported for phase I of (2) as a function of temperature. The “liquid” 1H-NMR spectrum is present far below the thermodynamic phase transition temperature T11-1, overlapping the wide line unresolved powder spectrum of phase II.

Pb VOLATILIZATION EFFECT ON DIELECTRIC AND PIEZOELECTRIC PROPERTIES IN A Ta-DOPED PMN-PT CERAMIC THICK DISK

2005 ◽  
Vol 19 (01n03) ◽  
pp. 549-552 ◽  
Author(s):  
C. ZHANG ◽  
J. T. WANG ◽  
S. X. SHEN ◽  
Y. FENG ◽  
I. AKUJOBI ◽  
...  
Keyword(s):  
Piezoelectric Properties ◽  
Dielectric Constants ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
X Ray ◽  
Ceramic Disk ◽  
Different Depths ◽  
Columbite Precursor ◽  
Dielectric And Piezoelectric Properties

A thick ceramic disk of 0.7 Pb ( Mg 1/3( Nb 0.9 Ta 0.1)2/3) O 3-0.3 PbTiO 3 ( PMNT - PT ) was prepared by columbite precursor method with PbO powder buffer surrounding the disk during the sintering process. The dielectric and piezoelectric properties and the microstructure of PMNT - PT samples cut from the different depths of the disk are studied. The phase purity is homogenous in the whole disk within our x-ray diffraction resolution. The dielectric constants, and the piezoelectric effect, d 33, vary with different samples. The samples cut from the middle parts of the disk have the higher d 33. It is believed that the sample processes, especially the Pb volatilization is responsible for these results.

Sign in / Sign up

Export Citation Format

Share Document