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Beall has not responded to a request for comment from Retraction Watch about why he decided to take down the site.
For more on Beall, see this mini-documentary from the CBC, which also includes segments on Retraction Watch and BMJ editor Fiona Godlee. Eastern: We’ve received a statement from the University of Colorado Denver: Jeffrey Beall, associate professor and librarian at the University of Colorado Denver, has decided to no longer maintain or publish his research or blog on open access journals and “predatory publishers.” CU Denver supports and recognizes the important work Professor Beall has contributed to the field and to scholars worldwide.
However, many of these form deep acceptors and do not produce significant p-type conduction at room temperature.
In the indirect or French process, metallic zinc is melted in a graphite crucible and vaporized at temperatures above 907 °C (typically around 1000 °C).
This property makes it a technologically important material for many piezoelectrical applications, which require a large electromechanical coupling.
Zn O has a relatively large direct band gap of ~3.3 e V at room temperature.
The hexagonal structure has a point group 6 mm (Hermann-Mauguin notation) or C as well as the strong piezoelectricity of Zn O.
The zincblende form can be stabilized by growing Zn O on substrates with cubic lattice structure.To maintain electrical neutrality, those planes reconstruct at atomic level in most relative materials, but not in Zn O – its surfaces are atomically flat, stable and exhibit no reconstruction. Its elastic constants are smaller than those of relevant III-V semiconductors, such as Ga N.The high heat capacity and heat conductivity, low thermal expansion and high melting temperature of Zn O are beneficial for ceramics.This indirect method was popularized by Le Claire (France) in 1844 and therefore is commonly known as the French process.Its product normally consists of agglomerated zinc oxide particles with an average size of 0.1 to a few micrometers.