Results 161 to 170 of about 285,312 (215)

Magnetic characteristics of K-, Na- and Rb-doped YBCO ceramics

Journal of Magnetism and Magnetic Materials, 1995
Abstract The magnetic behavior of Na-, K-, Rb-doped YBCO ceramic samples is investigated at ac magnetic field at 77 K. For small Rb and Na concentrations, an increase of the field-dependent component of the critical current is observed. High dopant concentrations lead to deterioration of the critical parameters of the YBCO material.
T. Nurgaliev, S. Miteva, I. Nedkov, A. Veneva   +3 more
openaire   +1 more source

Magnetic properties and surface resistance of Rb-doped YBaCuO ceramic

IEEE Transactions on Magnetics, 1994
The influence of Rb/sub 2/CO/sub 3/ additive on the properties of YBCO was investigated. The impurity was added to the usual stoichiometry of Y/sub 1/Ba/sub 2/Cu/sub 3/O/sub y/ to produce an initial batch with general formula Y/sub 1/Ba/sub 2/Cu/sub 3/(Rb)/sub x/O/sub y/ where x=0 to 0.60.
I. Nedkov, A. Veneva, S. Miteva, T. Nurgaliev, V. Lovchinov   +4 more
openaire   +1 more source

Electrical properties of A′Ca2Nb3O10 (A′=K, Rb, Cs) layered perovskite ceramics

Ionics, 2001
The electrical conductivity properties of Dion-Jacobson type layered perovskites A′Ca2Nb3O10 (A′=K, Rb, Cs) was investigated under different gas atmospheres. An increase in the electrical conductivity by about 2–5 orders in magnitude in both ammonia and hydrogen atmospheres is observed compared to air. Among the members of the series, the compound with
V. Thangadurai, W. Weppner
openaire   +1 more source

Experimental investigation on electrical discharge diamond grinding of RB-SiC ceramics

The International Journal of Advanced Manufacturing Technology, 2017
The reaction-bonded silicon carbide (RB-SiC) ceramics are very difficult to be machined by conventional techniques. In this work, a hybrid process termed electrical discharge diamond grinding (EDDG) was applied to the precision grinding of RB-SiC ceramics considering its weak electrical conductivity.
Xiaoshuang Rao, Feihu Zhang, Chen Li, Yingjie Li   +3 more
openaire   +1 more source

Enhanced electrical properties in Rb-substituted sodium bismuth titanate ceramics

Applied Physics A, 2016
Influence of large ionic radius cation rubidium (Rb) substitution in the A-site of sodium bismuth titanate (NBT) on remnant polarization and dielectric constant is investigated. Substitution of 0.01 mole fraction of Rb in NBT ceramics escalates remnant polarization and dielectric constant coupled with reduction in coercive field and enhanced ...
D. E. Jain Ruth, M. Muneeswaran, N. V. Giridharan, B. Sundarakannan   +3 more
openaire   +1 more source

RB-SiC Ceramics Derived from the Phenol Resin Added with Starch

Key Engineering Materials, 2007
Reaction bonded silicon carbide (RB-SiC) was fabricated by phenol resin, starch, solidified agent and silicon powder through the following steps: first, carbonizing at high temperature for 7-9h, infiltrating silicon at 1450-1600oC for 0.5-2h, and then removing excessive silicon at 1700oC for 0.5h. Scanning electron microscopy and X-ray diffraction were
Peng Cheng, Guan Jun Qiao, Di Chen Li, Ji Qiang Gao, Hong Jie Wang, Zhi Hao Jin   +5 more
openaire   +1 more source

Determination of photoelectron attenuation lengths in calcium phosphate ceramic films using XPS and RBS

Surface and Interface Analysis, 2003
Abstract Calcium phosphate (CaP) coatings are used to improve the biological performance of an implant. A technique that is often used to measure the composition of this material is XPS. When extremely thin coatings are measured, for example to study the interface between CaP and a substrate, the quantification of
Feddes, B., Wolke, J.G.C., Vredenberg, A.M., Jansen, J.A.   +3 more
openaire   +2 more sources

Nanomechanical characterization of RB-SiC ceramics based on nanoindentation and modelling of the ground surface roughness

Ceramics International, 2020
Abstract Reaction bonded silicon carbide (RB-SiC) ceramics are the primary structure and mold materials for the optical industry and mostly are machined by means of ultra-precision grinding to achieve a satisfactory surface quality. However, it is not easy to attain the theoretical prediction of surface quality, particularly surface roughness ...
Zhenzhong Zhang, Peng Yao, Jun Wang, Chuanzhen Huang, Hongtao Zhu, Hanlian Liu, Bin Zou   +6 more
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Measurement of elemental composition of carbon and composite ceramic materials using PIXE and RBS methods

Inorganic Materials: Applied Research, 2012
With the help of the PIXE and RBS methods, the elemental composition of a ceramic coating on Zr alloy, surface layers of heat-treated TiNi alloy, and Ar+ implanted pyrolytic graphite is investigated. It is shown that the PIXE and RBS methods are complementary and their combined use can provide additional information on the elemental composition of the ...
V. S. Avilkina, A. M. Borisov, B. V. Vladimirov, V. P. Petukhov, P. N. Chernykh   +4 more
openaire   +1 more source

High piezoelectric response and excellent fatigue resistance in Rb-substituted BNT–BKT–BT ceramics

Journal of Materials Science, 2020
Lead-free piezoelectric ceramics featuring high piezoelectricity and fatigue resistance are extremely important in practical applications. In this work, 0.85Bi0.5Na0.5TiO3–0.11Bi0.5K0.5−xRbxTiO3–0.04BaTiO3 (x = 0–0.20) ceramics are developed, and the effects of Rb content on the crystalline phase, domain structure, electric property, and fatigue ...
Xuefan Zhou, Xi Yuan, Zhongna Yan, Guoliang Xue, Hang Luo, Dou Zhang   +5 more
openaire   +1 more source