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 .

ChemInform Abstract: Synthesis of Rod-Shaped La0.7Sr0.3MnO3by a Simple Solid State Ceramic Route.

ChemInform ◽  
2008 ◽  
Vol 39 (10) ◽  
Author(s):  
Jing Feng ◽  
Shuyan Qi ◽  
Xiangyu Hou ◽  
Milin Zhang
Keyword(s):  
Solid State ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route

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.

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.

scholarly journals Temperature Stable, High-Quality Factor Li2TiO3-Li4NbO4F Microwave Dielectric Ceramics

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 741
Author(s):  
Shangrui Xu ◽  
Juan Jiang ◽  
Zelai Cheng ◽  
Xiangyi Chen ◽  
Shikuan Sun ◽  
...  
Keyword(s):  
Quality Factor ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric Ceramics ◽  
High Quality ◽  
Practical Applications ◽  
Microwave Dielectric ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
Dielectric Ceramics

In this work, (1-x)Li2TiO3-xLi4NbO4F ceramics were prepared by the conventional solid-state ceramic route. With the increase of Li4NbO4F content, the phase structure transformed from ordered monoclinic to disordered cubic. By increasing Li3NbO4F content, the temperature coefficient of resonant frequency (τf) was successfully adjusted closer to zero, while the dielectric constant (εr) and microwave quality factor (Qf) decreased to some degree. Outstanding microwave dielectric properties with a εr = 18.7, Qf = 61,388 GHz (6.264 GHz), and τf = 0.9 ppm/°C were obtained for 0.9Li2TiO3-0.1Li4NbO4F ceramics sintered at 1050 °C for 2 h, which indicated that these ceramics are suitable for practical applications in the field of microwave substrates and components.

A NOVEL DIELECTRIC CERAMIC FOR MICROWAVE PASSIVE CIRCUITS

2013 ◽  
Vol 22 ◽  
pp. 153-158 ◽  
Author(s):  
JOBIN VARGHESE ◽  
MATHEU PRESUME ◽  
KUZHICHALIL PEETHAMBHARAN SURENDRAN ◽  
MAILADIL THOMAS SEBASTIAN
Keyword(s):  
Thermal Conductivity ◽  
Thermal Expansion ◽  
Thermal Properties ◽  
Room Temperature ◽  
Dielectric Ceramic ◽  
Microwave Frequencies ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
First Time

The tetragonal Ca 9 Nd 2 W 4 O 24 (CNW) ceramic was prepared by the conventional solid state ceramic route and their dielectric properties were investigated in the radio and microwave frequencies. The CNW ceramics sintered at 1450 °C for 4 h showed a densification 92 % with εr = 16 and tanδ = 0.004 at 15.1 GHz. The thermal conductivity of ceramic at room temperature was found to be 1.6 W m−1K−1 and coefficent of thermal expansion of CNW ceramics was 4.2 ppm/°C measured in the range of 25 to 600 °C. The dielectric and thermal properties of CNW ceramic are reported for the first time.

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.

Solid-state ceramic actuator designs

AIAA Journal ◽  
2001 ◽  
Vol 39 ◽  
pp. 1354-1362
Author(s):  
Aydin Dogan ◽  
James Tressler ◽  
Robert E. Newnham
Keyword(s):  
Solid State ◽  
State Ceramic
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