scholarly journals Ferroelectric and Dielectric Properties of BaZr0.2[Ti(1-x)Mgx/3Ta2x/3]0.8O3 Solid Solution

2021 ◽  
Vol 8 ◽  
Author(s):  
Jithesh Kavil ◽  
Jobin Varghese ◽  
Govind Raj Kovummal
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Transition Temperature ◽  
Dielectric Properties ◽  
Frequency Range ◽  
Minute Amount ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
Structure And Microstructure

BaZr0.2[Ti(1-x)Mgx/3Ta2x/3]0.8O3 (x = 0.0, 0.05, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0) (BZTMT) ceramics were prepared through conventional solid state ceramic route. The crystal structure and microstructure of the compounds were investigated respectively using XRD and SEM. The dielectric properties were measured in the frequency range of 100 Hz–1 MHz. The ferroelectric Curie temperature of BaZr0.2Ti0.8O3 (x = 0) shifted from 21°C to -10°C with the addition of minute amount of dopant (x = 0.025) and the paraelectric transition temperature is diffusive in nature. The relative permittivity and dielectric loss of BZTMT at 1 MHz varies from 5205 to 24 and 1.8 × 10–2 to 2.0 × 10–5 respectively, as the value of x increases from 0 to 1.

DIELECTRIC BEHAVIOUR OF MANGANESE MODIFIED STRONTIUM TITANATE CERAMICS SYNTHESIZED BY SOLID STATE CERAMIC ROUTE

2013 ◽  
Vol 22 ◽  
pp. 207-216
Author(s):  
PRAKASH SINGH ◽  
PRABHAKAR SINGH ◽  
OM PARKASH ◽  
DEVENDRA KUMAR
Keyword(s):  
Solid Solution ◽  
Dielectric Constant ◽  
Solid State ◽  
Space Charge ◽  
Single Phase ◽  
Dielectric Behaviour ◽  
Average Grain Size ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route

Various compositions with x=0.01, 0.05, 0.10, 0.20 and 0.30 in the system SrTi 1-x Mn x O 3 were prepared by solid state ceramic route. Compositions with x ≤ 0.10 were found to be single phase solid solution. In this paper, the result of investigations on the effect of manganese substitution in SrTiO 3 on dielectric behaviour for the compositions with x ≤ 0.10, which form single phase solid solution have been reported. Average grain size is small, this may be due to segregation of dopant at grainboundaries. Dielectric measurements were made in the temperature range 150–500K. Measurements of dielectric properties show that there is not much space charge polarisation across the grains and grainboundaries interface. This space charge polarisation only occurs at high temperature and one observes large dispersion of dielectric constant and dissipation factor. At low temperatures, dielectric behaviour follows the character of SrTiO 3 with only difference in the values of dielectric constant.

Novel glass free ceramic for LTCC applications

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000303-000306
Author(s):  
Dhanesh Thomas P. Abhilash ◽  
M. T. Sebastian
Keyword(s):  
Thermal Expansion ◽  
Dielectric Properties ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
Tio2 Addition

The LiZnPO4 ceramic has been prepared by the conventional solid state ceramic route. The ceramic sintered at 825 °C has an εr of 4.9, Qu×f of 65400 GHz, and τf of −80 ppm/°C. The LiZnPO4 ceramic shows low coefficient of thermal expansion (CTE) of 5.3 ppm/°C. The slightly large negative τf of LiZnPO4 has been tuned nearly to zero with TiO2 addition. LiZnPO4-TiO2 composite containing 0.15 volume fraction TiO2 sintered at 925 °C shows good microwave dielectric properties: εr = 7.8, Qu×f = 39800 GHz and τf = −6.8 ppm/°C. LiZnPO4−0.15 Vf TiO2 composite shows a CTE of 6.9 ppm/°C.

scholarly journals Raman spectroscopy and microwave dielectric properties of Sn substituted SrLa4Ti5O17 ceramics

2016 ◽  
Vol 34 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Abdul Manan ◽  
Atta Ullah ◽  
Arbab Safeer Ahmad
Keyword(s):  
Dielectric Properties ◽  
Resonant Frequency ◽  
Single Phase ◽  
Microwave Dielectric Properties ◽  
Secondary Phases ◽  
Microwave Dielectric ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
The Cost

AbstractSrLa4Ti5−xSnxO17 (0 ≤ x ≤ 2) ceramics were fabricated through solid state ceramic route and their microwave dielectric properties were investigated in an attempt to tune their temperature coefficient of resonant frequency (τf) to zero. The compositions were sintered to single phase SrLa4Ti5O17 and SrLa4Ti4.5Sn0.5O17 ceramics at x = 0 and x = 0.5, and SrLa4Ti4−xSnxO17 along with a small amount of La2Ti2O7 at x = 1. The major phase observed at x = 2 was La2Ti2O7 but along with SrLa4Ti4SnO17 and SrLa4Ti4O15 as the secondary phases. τf decreased from 117 to 23.0 ppm/°C but at the cost of dielectric constant (εr) and quality factor multiplied by resonant frequency (Qufo) which decreased from 65 to 33.6 and 11150 to 4191 GHz, respectively. The optimum microwave dielectric properties, i.e. τf = 38.6 ppm/°C, εr = 45.5 and Qufo = 7919 GHz, correspond to the SrLa4Ti5−xSnxO17 composition with x = 1.

Synthesis of rod-shaped La0.7Sr0.3MnO3 by a simple solid state ceramic route

2007 ◽  
Vol 9 (11) ◽  
pp. 1033-1035 ◽  
Author(s):  
Jing Feng ◽  
Shuyan Qi ◽  
Xiangyu Hou ◽  
Milin Zhang
Keyword(s):  
Solid State ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route

Sodium Alanate Dehydrogenation Properties Enhanced by MnTiO3 Nanoparticles

2020 ◽  
Vol 15 (2) ◽  
pp. 197-203
Author(s):  
Yujie Sun ◽  
Xia Yang ◽  
Yue Huang ◽  
Jianquan Li ◽  
Xinghua Cen ◽  
...  
Keyword(s):  
Solid State ◽  
Hydrogen Desorption ◽  
Test Results ◽  
X Ray Diffraction ◽  
X Ray ◽  
Sodium Alanate ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
First Time

In this study, we investigated the influence of MnTiO3 nanoparticles additive on hydrogen released performance of NaAlH4 for the first time. The MnTiO3 nanoparticles were successfully synthesized using conventional solid-state ceramic route. It was found that the hydrogen released performance of NaAlH4 can be significantly improved by the addition of MnTiO3 nanoparticles. Meantime, the composite of NaAlH4 doped 5 wt% MnTiO3 possessed excellent dehydrogenation properties, the onset dehydrogenation temperature was only 70.6 °C, reduced by about 105 °C in comparison with the pristine NaAlH4, and approximately 5.01 wt% of hydrogen could be released from composite with temperature heated to 220 °C. The isothermal dehydrogenation test results indicated that the amount of hydrogen released by NaAlH4-5 wt% MnTiO3 composite could reach 4.4 wt% under 200 °C within 25 min. According to the analysis of X-ray diffraction, the presence of MnTiO3 nanoparticles did not alter the overall dehydrogenation pathway of NaAlH4, and the Al3 Ti phases formed after dehydrogenation, which enhanced hydrogen desorption performances of NaAlH4 .

Structural and Dielectric Properties of XBaZr0.2Ti0.8O3-(1-x)BiFeO3 Solid Solution Ceramics

2014 ◽  
Vol 787 ◽  
pp. 261-266
Author(s):  
Wei Cai ◽  
Shi Xing Zhong ◽  
Chun Lin Fu ◽  
Gang Chen ◽  
Xiao Ling Deng
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Solid State Reaction Method ◽  
Barium Zirconate ◽  
Conventional Solid State Reaction ◽  
Barium Zirconate Titanate ◽  
Zirconate Titanate

xBaZr0.2Ti0.8O3-(1-x)BiFeO3(x=0, 0.3, 0.5, 0.7) solid solution ceramics were prepared by conventional solid-state reaction method. The crystal structure and dielectric properties ofxBaZr0.2Ti0.8O3-(1-x)BiFeO3ceramics have been investigated. The result indicates that the crystal structure of solid solution ceramics changes from rhobohedral to pseudocubic structure with the increase of barium zirconate titanate content. The room temperature dielectric constant of all samples decreases with the increasing of frequency. When the temperature is in the range of 30oC~150oC, the dielectric constant of all samples increases as temperature rises. In the same temperature range, the dielectric loss of BiFeO3ceramics increases with the rise of temperature and the dielectric loss ofxBaZr0.2Ti0.8O3-(1-x)BiFeO3(x=0.3~0.7) changes a little. The addition of barium zirconate titanate leads to the decrease of dielectric loss and leakage current for BiFeO3ceramics.

Dielectric and Piezoelectric Properties of (Na,Ba)(Nb,Ti)O3 Lead-Free Piezoelectric Ceramics

2010 ◽  
Vol 445 ◽  
pp. 55-58 ◽  
Author(s):  
Rintaro Aoyagi ◽  
Makoto Iwata ◽  
Masaki Maeda
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Dielectric Properties ◽  
Room Temperature ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Electromechanical Coupling Factor ◽  
Coupling Factor ◽  
Lead Free ◽  
Dielectric And Piezoelectric Properties

(Na1-xBax)(Nb1-xTix)O3 (NNBTx; x=0.0-0.21) solid-solution ceramics were synthesized and their crystal structure, dielectric properties and piezoelectric properties were investigated. The crystal structure at room temperature of NNBTx varied from orthorhombic to tetragonal with increasing BaTiO3 content x. The phase boundary between orthorhombic and tetragonal at room temperature was confirmed BT content between x=0.08 and 0.09. For x>0.05, it was found that the Curie temperature was decreased with increasing x. The highest electromechanical coupling factor, kp, and the largest piezoelectric constant, d33, were obtained at x=0.09-0.10.

Ionic doping effects on crystal structure and relaxation character in Bi0.5Na0.5TiO3 ferroelectric ceramics

2007 ◽  
Vol 22 (3) ◽  
pp. 730-734 ◽  
Author(s):  
Dan Shan ◽  
Yuanfang Qu ◽  
Jianjing Song
Keyword(s):  
Crystal Structure ◽  
Phase Transition ◽  
Transition Temperature ◽  
Dielectric Properties ◽  
Lattice Structure ◽  
Ferroelectric Ceramics ◽  
Ambient Atmosphere ◽  
Doping Effects ◽  
Temperature Dependences ◽  
Atmosphere Temperature

The effects of ionic doping in Bi0.5Na0.5TiO3 (BNT) ceramics were investigated. Pure and doped BNT samples containing 0 to 16 at.% Ba2+ and 0 to 1.0 at.% Ce4+ were synthesized at 1135 to 1200 °C for 2 h in ambient atmosphere. Temperature dependences of dielectric properties were analyzed. These results suggest that Ba2+ and Ce4+ replace the ions in A and B sites of perovskite structures, and the lattice structure is altered. The component differences of each crystal domain lead to variance of phase transition temperature, which enhances the relaxation character in BNT ceramics, and the dielectric properties were consequently improved.

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