The infl uences of mass concentration of nickel chloride hexahydrate, sodium borohydride, ethylenediamine, pH value, bath temperature on deposition rate were studied with orthogonal experiments by a series of pre-treatments on micro-diamond particle, and the optimized parameters were obtained. Both the morphology and the composition of original diamond and the diamond with Ni-B coating were analyzed by SEM and XRD respectively. The SEM image shows that the spherical Ni-B particle is coated upon diamond. XRD pattern shows that the coating compositions are Ni and Ni 2 B.
Nb-doped SrBi 4 Ti 4 O 15 (SBT) was produced by conventional method. Structural and ferroelectric properties of SBT were examined as a function of niobium composition. Analyzing the structure futures of SBT by XRD, XPS and Raman spectrum, Nb 5+ substituted Ti 4+ to form NbO 6 octahedron and did not change the structure of SBT. The XRD patterns indicated the formation of the single phase of SBT for x=0.01and 0.03 and secondary phase of Sr 3 Ti 2 O 7 appeared when x>0.1. To compare the effect of Nb doping, the ferroelectric properties (hysteresis loop, piezoelectric coefficient) of Nb-doped SBT were measured. The SBT doped with x=0.15 was found to exhibit higher remanent polarization with d 33 =17 pC/N.
The microwave dielectric properties of the (1−x)CaTiO3–xCa(Zn1/3Nb2/3)O3 ceramic system have been investigated. The ceramic samples sintered at 1300°–1450°C for 4 h in air exhibit orthorhombic pervoskite and form a complete solid solution for different x value. When the x value increased from 0.2 to 0.8, the permittivity ɛr decreased from 115 to 42, the unloaded quality factor Q×f increased from 5030 to 13 030 GHz, and the temperature coefficient τf decreased from 336 to −28 ppm/°C. When x=0.7, the best combination of dielectric properties, a near zero temperature coefficient of resonant frequency of τf∼−6 ppm/°C, Q×f∼10 860 GHz and ɛr∼51 is obtained.
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