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A positron lifetime study of lanthanum and niobium doped
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Image of FIG. 1.
FIG. 1.

The lattice parameter as well as the unit cell volume as a function of lanthanum and nionbium dopant concentration (a). The ratio of the -value splitting as well as the angle of the rhombohedral unit cell is shown in a manner (b). The undoped sample is represented by ×.

Image of FIG. 2.
FIG. 2.

Typical SEM micrographs of undoped (a), 1.0 (b), 2.0 (c), and (d) doped polished sample surfaces.

Image of FIG. 3.
FIG. 3.

Deconvoluted lifetime parameters as a function of (a) and (b) dopant concentration for samples sintered in oxygen for at and in air for at .

Image of FIG. 4.
FIG. 4.

Positron annihilation Doppler broadening parameters ( and ) for - (a) and -doped (b) sample sintered under oxygen for at .

Image of FIG. 5.
FIG. 5.

core photoelectron emission spectra as a function of doping concentration (a) The -doped as entered (i), after of sputtering (ii), and after an -plasma treatment (iii) is shown in (b).

Image of FIG. 6.
FIG. 6.

XPS spectra on for the sample doped with .


Generic image for table
Table I.

Table of the ionic radii after Shannon et al. (refs. 45 and 46).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A positron lifetime study of lanthanum and niobium doped Pb(Zr0.6Ti0.4)O3