FERROELECTRIC AND PIEZOELECTRIC PROPERTIES OF Gd3+ AND Y3+ MODIFIED PKN ELECTROCERAMICS

2008 ◽  
Vol 22 (15) ◽  
pp. 1515-1523
Author(s):  
K. SAMBASIVA RAO ◽  
D. MADHAVA PRASAD ◽  
P. MURALI KRISHNA ◽  
JOON HYUNG LEE
Keyword(s):  
Piezoelectric Properties ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
X Ray ◽  
Polarization Electric Field ◽  
Solid State Reaction Route ◽  
Quality Factor Q ◽  
Ferroelectric And Piezoelectric Properties ◽  
Piezoelectric Constants

Ceramics with the composition Pb 1-x K 2x-3y M y Nb 2 O 6 (PKMN) with x = 0.29, y = 0.145 and M = Gd 3+, Y 3+ were synthesized by the solid-state reaction route between the corresponding oxides and carbonates. The crystal structure was confirmed by X-ray diffraction (XRD). The temperature dependence of dielectric properties were measured from 35 to 595°C. Well-developed P–E (polarization–electric field) hysteresis loops were observed in the materials. Determining the piezoelectric constants, Kp = 20%, Kt = 49%, d33 = 110, and quality factor, Qm = 33, reveals that the material Y 3+-modified PKN can be useful for transducer applications.

Crystal Structure of the New Phosphate AgMnPO4

2009 ◽  
Vol 64 (7) ◽  
pp. 875-878 ◽  
Author(s):  
Hamdi Ben Yahia ◽  
Etienne Gaudin ◽  
Jacques Darriet
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Diffraction Data ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
X Ray ◽  
Solid State Reaction Route ◽  
Symmetry Space ◽  
Symmetry Space Group ◽  
Silver Atoms

The new compound AgMnPO4 has been synthesized by a solid-state reaction route. Its crystal structure was determined from single-crystal X-ray diffraction data. AgMnPO4 crystallizes with triclinic symmetry, space group P1̄, a = 9.6710(6), b = 5.695(2), c = 6.629(3) Å , α = 102.55(3), β = 105.85(2), γ = 80.70(2)◦, and Z = 4. Its structure is built up from MnO6, MnO5 and PO4 polyhedra forming tunnels filled with silver atoms.

scholarly journals Influence of Processing Conditions on Crystal Structure of Bi6Fe2Ti3O18 Ceramics

2016 ◽  
Vol 61 (2) ◽  
pp. 881-886 ◽  
Author(s):  
A. Lisińska-Czekaj ◽  
M. Lubina ◽  
D. Czekaj ◽  
M. Rerak ◽  
B. Garbarz-Glos ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ambient Air ◽  
Processing Conditions ◽  
Orthorhombic Structure ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
X Ray ◽  
Number Of Layers ◽  
Solid State Reaction Route ◽  
Diffraction Patterns

Abstract Aim of the present research was to apply a solid state reaction route to fabricate Aurivillius-type ceramics described with the formula Bi6Fe2Ti3O18 (BFTO) and reveal the influence of processing conditions on its crystal structure. Pressureless sintering in ambient air was employed and the sintering temperatures were 850 and 1080 °C. It was found that the fabricated BFTO ceramics were multiphase ones. They consisted of two Bim+1Fem-3Ti3O3m+3 phases, namely the phase with m=5 (i.e. the stoichiometric phase) and m=4 (i.e. the phase with a reduced number of layers in the slab). Detailed X-ray diffraction patterns analysis showed that both phases adopted the same orthorhombic structure described with Fmm2 (42) space group. The ratio of weight fractions of the constituent phases (m=5): (m=4) was ~30:70.

DEVELOPMENT OF PEROVSKITE INPrSUBSTITUTEDPb(Zr0.52Ti0.48)O3AND DIELECTRIC CHARACTERISTIC

2006 ◽  
Vol 20 (21) ◽  
pp. 3071-3080 ◽  
Author(s):  
N. UDOMKAN ◽  
P. LIMSUWAN ◽  
P. WINOTAI ◽  
T. TUNKASIRI
Keyword(s):  
Lead Zirconate Titanate ◽  
Ferroelectric Property ◽  
Piezoelectric Properties ◽  
Pyrochlore Phase ◽  
Hysteresis Loops ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Dopant Content ◽  
X Ray

The purpose of this research is to investigate the structure of lead zirconate titanate ceramics ( Zr:Ti =52:48) when doped with Pr2O3and the corresponding properties such as micro-structural properties, physical properties, dielectric constant (εr), piezoelectric properties (kp, Qm, and d33), and the ferroelectric property. The materials were prepared via conventional mixed oxide method and sintered at 1200°C. The Rietveld refinement of X-ray diffraction patterns and combination of both patterns revealed the tetragonal structure for all samples to have space group of P4mm. For higher dopant content (10 mol%), the pyrochlore phase of Pr2O3also appeared in the respective samples. These pyrochlore phases caused the detriment of dielectric and piezoelectric properties. For those with lower dopant content (1.00 mol%), the Pr ion substituted at the A and B sites with isovalent dopant effects, i.e. a lower value of εr, and kp. The hysteresis loops indicated the ferroelectric property for all samples. The microstructure showed dense grain according to a high density and the additional phases of Pr2O3were clearly observed for 10 mol% doping. The Curie temperature decreased with increasing dopant content, as determined from high temperature X-ray diffraction and differential scanning calorimetry.

Dielectric and Piezoelectric Properties of Na0.42K0.08Bi0.5 TiO3 and Na0.45K0.05Bi0.5TiO3 Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 251-254 ◽  
Author(s):  
Su Chuan Zhao ◽  
Lina Zhang ◽  
Guo Rong Li ◽  
Liao Ying Zheng ◽  
Ai Li Ding
Keyword(s):  
Room Temperature ◽  
Piezoelectric Properties ◽  
Perovskite Phase ◽  
X Ray Diffraction ◽  
Depolarization Temperature ◽  
X Ray ◽  
Single Perovskite Phase ◽  
Dielectric And Piezoelectric Properties ◽  
Rhombohedral Symmetry ◽  
Ferroelectric And Piezoelectric Properties

Na0.42K0.08Bi0.5TiO3 and Na0.45K0.05Bi0.5TiO3 ceramics were fabricated by the solid-state reaction. The structures were determined by X-ray diffraction. Dielectric, ferroelectric and piezoelectric properties of the ceramics were measured and discussed. The ceramics have a single perovskite phase with rhombohedral symmetry at room temperature. The thermal variations of the permittivity follow the law 1/ e − 1/ em = C(T − Tm)2 which is the character of typical relax ferroelectrics, when temperature is higher than the temperature of the maximum of dielectric constant (Tm). The depolarization temperature (Td) of spontaneous polarization is 215oC for Na0.45K0.05Bi0.5TiO3 and 152oC for Na0.42K0.08Bi0.5TiO3 respectively. There exist two different dielectric behaviors of the Na0.42K0.08Bi0.5TiO3 ceramic, without and after poling. Na0.45K0.05Bi0.5TiO3 possesses relatively high kt and Td. The use for device application has been indicated.

scholarly journals Dielectric Properties of 0.95 ( )-0.05 Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Rekha Rani ◽  
Parveen Kumar ◽  
J. K. Juneja ◽  
K. K. Raina ◽  
Chandra Prakash
Keyword(s):  
Dielectric Properties ◽  
Lead Zirconate Titanate ◽  
Nickel Ferrite ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Magnetoelectric Composites ◽  
Solid State Reaction Route

We report studies on dielectric properties of magnetoelectric composites of La-substituted lead zirconate titanate (PLZT) and zinc-doped nickel ferrite (NZF) with compositional formula 0.95 Pb1-3x/2LaxZr0.65Ti0.35O3-0.05 Ni0.8Zn0.2Fe2O4(, 0.01, 0.02, and 0.03). The materials were synthesized by conventional solid state reaction route. The presence of individual phases (PLZT and NZF) was confirmed by using X-ray diffraction technique. Dielectric properties were studied as a function of temperature and frequency. Significant improvement was observed in dielectric properties with addition of La.

Electrical Properties of BNKTZ Ceramics as a Function of Calcination Temperature

2016 ◽  
Vol 872 ◽  
pp. 103-108
Author(s):  
Pichitchai Butnoi ◽  
Supalak Manotham ◽  
Pharatree Jaita ◽  
Ratabongkot Sanjoom ◽  
Denis Russell Sweatman ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Calcination Temperature ◽  
Piezoelectric Properties ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Xrd Patterns ◽  
Ferroelectric And Piezoelectric Properties ◽  
Xrd Method

In this research, the Bi0.5(Na0.80K0.20)0.5Ti0.99Ti0.10O3 were prepared via a conventional solid-state reaction method, and their properties were related with calcination temperature. The crystalline structure of BNKTZ ceramics was assessed by X-ray diffraction (XRD) method. Other physical properties, i.e. porosity, density, microstructure, and electrical properties were determined. XRD patterns for all samples showed a pure perovskite, where coexistence between rhombohedral and tetragonal phases was observed for some conditions. The optimum dielectric constant was obtained for the ceramic calcined at 800 °C. The ferroelectric and piezoelectric properties were improved and showed the highest values for the calcination temperature around 900-1000°C. The improvements of ferroelectric and piezoelectric properties were proposed to be due to the ceramics had compositions closed to MPB composition. Furthermore, density also had a contribution for the improvements.

Dielectric Behavior of (1-X)BaTiO3-XCaCu2.94Mn0.06Ti4O12 Composite Ceramics

2008 ◽  
Vol 368-372 ◽  
pp. 62-64 ◽  
Author(s):  
Gang Yang ◽  
Zhen Xing Yue ◽  
Xiang Li ◽  
Tian Wang ◽  
Long Tu Li
Keyword(s):  
Solid State ◽  
Dielectric Loss ◽  
Dielectric Permittivity ◽  
Solid State Reaction ◽  
Dielectric Behavior ◽  
Composite Ceramics ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
X Ray ◽  
Solid State Reaction Route

(1-X)BaTiO3-XCaCu2.94Mn0.06Ti4O12 (BTO-CCMTO) composite ceramics with X =0.1 and 0.2 were prepared through solid state reaction route. X-ray diffraction (XRD) analyses showed that a co-existence structure of BTO and CCMTO phase can be realized when the sample was sintered at 950°C. Furthermore, influences of CCMTO on the dielectric behaviors of the BTO-CCMTO composite ceramics were investigated. The results showed that the dielectric permittivity of the BTO-CCMTO composite ceramics increases with increasing amounts of CCMTO and the Curie peak of the pure BTO ceramics is greatly suppressed due to the addition of CCMTO. The dielectric loss of the BTO-CCMTO composite ceramics can be kept in the same magnitude order as that of the BTO ceramics.

The Electrical Conductivity and Infrared Properties of Ba-Doped SmCoO3-δ Composite Oxides

2011 ◽  
Vol 239-242 ◽  
pp. 687-690
Author(s):  
Le Chen ◽  
Chun Hua Lu ◽  
Yuan Zheng Zhao ◽  
Wen Yan Zhang ◽  
Ya Ru Ni ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Double Perovskite ◽  
Infrared Emissivity ◽  
Electrical Behavior ◽  
X Ray Diffraction ◽  
Reaction Route ◽  
X Ray ◽  
Composite Oxides ◽  
Solid State Reaction Route ◽  
Emissivity Measurements

Layered SmBaCo2O5+δ with the cation-ordered double perovskite structure were synthesized by the solid-state reaction route and characterized by thermal analysis, X-ray diffraction, infrared spectrum, electrical conductivity and infrared emissivity. The Sm1-xBaxCoO3(SBCO) system shows the different crystal structures with the variation of barium content, which results in the different electrical behavior. The electrical conductivity reaches maximum when x is 0.5 with SmBaCo2O5.54 phase. The infrared absorption occurs at about 600 cm-1 for all the samples which were attributed to Co-O stretching modes. The peak shifted to a lower frequency with the increase of doping level. In addition, the comparison of electrical and emissivity measurements suggested that variation of infrared emissivity is in agreement with the electrical properties.

scholarly journals Ferroelectric and Dielectric Properties of Strontium Titanate Doped with Barium

Magnetism ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 22-36
Author(s):  
Ahmed Maher Henaish ◽  
Maha Mostafa ◽  
Ilya Weinstein ◽  
Osama Hemeda ◽  
Basant Salem
Keyword(s):  
Dielectric Properties ◽  
Temperature Dependence ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
Precursor Method ◽  
Xrd Pattern ◽  
X Ray ◽  
Polarization Electric Field ◽  
Increasing Temperature ◽  
Tio2 Phase

Ferroelectric samples Sr1−xBaxTiO3 (BST), where x = 0, 0.2, 0.4, 0.6, 0.8 and 1, were prepared using the tartrate precursor method and annealed at 1200 °C for 2 h. X-ray diffraction, “XRD”, pattern analysis verified the structure phase. The crystallite size of the SrTiO3 phase was calculated to be 83.6 nm, and for the TiO2 phase it was 72.25 nm. The TEM images showed that the crystallites were agglomerated, due to their nanosize nature. The AC resistivity was measured as temperature dependence with different frequencies 1 kHz and 10 kHz. The resistivity was decreased by raising the frequency. The dielectric properties were measured as the temperature dependence at two frequencies, 1 kHz and 10 kHz. The maximum amount of dielectric constant corresponded to the Curie temperature and the transformation from ferroelectric to paraelectric at 1 kHz was sharp at 10 kHz. Polarization–electric field hysteresis loops for BST samples were measured using a Sawer–Tawer modified circuit. It was shown that the polarization decreased with increasing temperature for all samples.

EFFECT OF CeO2ON SINTERING TEMPERATURE AND PIEZOELECTRIC PROPERTIES PZT (Zr:Ti = 52:48) CERAMICS

2005 ◽  
Vol 19 (10) ◽  
pp. 1757-1769 ◽  
Author(s):  
P. SRIMAUNGSONG ◽  
N. UDOMKAN ◽  
L. PDUNGSAP ◽  
P. WINOTAI
Keyword(s):  
Lead Zirconate Titanate ◽  
Piezoelectric Properties ◽  
Ferroelectric Properties ◽  
Hysteresis Loops ◽  
Lead Zirconate ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Dopant Content ◽  
X Ray ◽  
Grain Distribution

The purpose of this research is to investigate the structure of lead zirconate titanate ceramics (Zr:Ti = 52:48) doped with CeO2and corresponding properties such as micro-structural properties, physical properties, dielectric constant (εr), piezoelectric properties (kp, Qm, and d33), and the ferroelectric property. The specimens were prepared via a conventional mixed oxide method and sintered at 1200°C. Rietveld refinement of X-ray diffraction patterns resulted in the P4mm tetragonal structure for all samples. At a high dopant content (10 mol%), pyrochlore phases of CeO2appeared which caused the detriment of dielectric and piezoelectric properties. At a low dopant content (1 mol%), Ce4+ions entered the B site with isovalent dopant effects, and clearly resulted lower values of εr, and kpcompared with those of the undoped sample. The hysteresis loops showed ferroelectric properties for all samples. Microstructures displayed dense grain distribution and thus yielded a high density. The additional phase of CeO2was clearly observed for 10 mol% doping which implied it was overdoped. Finally, the Curie temperature has been found to decrease with increasing dopant content, as determined from high temperature X-ray diffraction and differential scanning calorimetry.

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