Green disks of Ti-Nb-Ba were made from the starting powders and sintered at 1250–1300 °C for 2 h. The microstructures of the sintered compacts were examined by SEM. The dielectric and nonlinear electric properties of the samples were investigated and the results show the Ti-Nb-Ba system ...
Dielectric and Piezoelectric Properties of Non-Stoichiometric Sr1-xBi2+2x/3Ta2O9 Ceramics Prepared from Sol-Gel Derived Powders Sr1-xBi2+2 x/3Ta2O9 ceramics with x = 0, 0.15, 0.30, 0.45 having Sr-deficiency and Bi-excess have been prepared using sol gel derived powders. Sintering at......
Luminescence properties of Nd 3+ doped (1, 2 and 3 mol%) LiNbO 3 powders prepared by a sol–gel process are reported in this paper. Infrared emission transitions ( 4F 3/2→ 4I 9/2, 11/2 and 13/2) of Nd 3+ at 890, 1060 and 1340 nm have been measured under the excitation of...
Polymer derived SiCO ceramic powders were fabricated by pyrolysis of polycarbosilane precursor. The oxidation behaviors of these powders were studied by thermogravimetric analysis at the temperature range of 900–1400°C. The oxidation parabolic constants at different temperatures were calculated. From these...
Microstructure of sintered samples revealed the grain size and morphology of Li2Si2O5 ceramics. Although grain size in both samples increased with increasing sintering temperature, samples from the alkoxide route derived powders had more uniform grain size and pore distribution. In addition, open ...
Effect of Powder Characteristics on Sintering Behavior and Mechanical Properties of Alumina Compacted by High-Speed Centrifugal Compaction Process Two types of fine (0.2 渭m) and pure (99.99%) alumina powders are dispersed in ion-exchanged water and compacted into a columnar shape of 蠁 8 脳 60...
The grain size estimated from SEM observation was about 50 nm, being in good agreement with that (20 nm) calculated from XRD patterns. PZN–BT ceramics were also obtained by sintering the synthesized powders at 1050°C for 1 h. Dielectric properties of the (1−x)PZN–xBT ceramics...
Within this study, the oxidation behavior of SiHfBCN ceramic powders and monoliths was studied at temperatures from 1200 to 1400°C. Both powder and monolithic samples exhibited parabolic oxidation behavior characterized by very low rates (10−9to 10−8mg2cm−4h−1). The activation energy ...
All the samples were deposited on the abovementioned polished GC electrode with loading of 0.32 mg/cm2 and to avoid detachment of the powders from the GC electrode, Nafion ionomer (5 wt -% dispersion in ethanol and water) was applied as a binder. Then, in the course of the HER, N2 (...
- 《Materials Science & Engineering A Structural Materials Properties Microstructure & Processing》 被引量: 54发表: 2008年 Preparation and characterization of BaTiO3 powders and ceramics by sol–gel process using oleic acid as surfactant The BaTiO3 xerogels, powders and ceramics were prepared via the...