ISSN:
1551-2916
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Maschinenbau
,
Physik
Notizen:
By controlling the granulometric distribution of the powders, a density of 〉96% of the theoretical density has been attained for Ba(Zn1/3Ta2/3)O3 that has been sintered at a low temperature (1450°C) for a short soaking time (2 h). Attrition milling produces a very fine and monomodal powder that allows for good densification. The attrition conditions result from a compromise between granulometric distribution and the risk of pollution. We have found a great influence of the origin of the raw materials on the temperature coefficient of frequency, allowing a modulation in the range of 0-15 ppm/°C. Finally, we have studied the influence of each step of the process on the dielectric properties and identified the secondary phases that form with the evaporation of zinc: an eight-layered hexagonal perovskite and a tetragonal tungsten-bronze-type phase.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1151-2916.1997.tb03081.x
Permalink