Austrian PTs show a low level of engagement in EBP. Initiatives to advance EBP in Austria and other countries with no academic or research tradition should primarily target practitioner-level factors.
The accurate lattice parameters and the extremely small lattice strains of iron iodine boracite, Fe3B7013I, have been successfully measured over the paraelectric and the ferroelectric regions by using special x-ray di6'raction methods. The spontaneous strains in the ferroelectric state could be separated into two parts, a linear strain (pure shear) and quadratic ones (electrostrictions). It is a conspicuous feature of the electromechanical properties of Fe337013I that the electrostrictions prevail over the linear strain induced through a torsional piezoelectric constant b36 of the paraelectric phase. The electrostrictive constants are approximately two orders of magnitude larger than those of KH&PO4. Another phase transformation at a lower temperature was disclosed by the present diffractometry. At this temperature a special rhombohedral lattice is formed, and the piezoelectric constant b36 vanishes.
The strong dynamics of magnetic correlations are observed by high field
57Fe Mössbauer investigations for the spin glasses
AuFe and Y(Fe, Al)2 in the temperature interval between
the freezing temperature Tf and
approximately 7 to 10Tf. All
recorded spectra can be analysed with a model which takes into account these
dynamics by allowing the formation of correlated states after a stochastically
varying time τoff and their decay after a time
τon, restricting the number of subspectra to the
different number of Fe atoms in the first neighbour shell. Whereas for the
different Fe environments, in addition to centre shift and quadrupole
splitting, different hyperfine fields of the two stochastically formed states
can always be resolved, the same set of τon and
τoff values was obtained for all subspectra above
approximately 4Tf. The external
field hinders the decay of the correlated regions. The temperature dependence
of ¿ on scales with
Tf and exhibits a power law with
exponents of –2 for the Fe-rich and –1 for the Fe-poor compounds.
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