ISSN:
1573-482X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Positron annihilation spectroscopy has been used to study the formation and complex of Pb and O vacancies in polycrystalline Pb0.85Sr0.15(Zr0.55Ti0.45)O3(PSZT) ceramics with various amounts of Mn and (Sb, Nb) dopants, fabricated from mixed-oxide powders. The results suggest that the positron may be trapped by VPb vacancies and VPb-Vo pairs in PSZT with characteristic lifetimes of 305±6 and 379±15 ps, respectively. Doped Mn3+/2+ ions are assumed to substitute for (Zr, Ti)4+ in the perovskite (ABO3) lattice and Vo vacancies were created for charge compensation. VPb vacancies were generated when partial Sb3+ entered the Pb2+ site or certain amounts of Sb5+ occupied the B site. Impurity ions serving as acceptors or donors significantly affect the conduction process and dielectric and piezoelectric behaviour which could be accounted for by the defect structures of PSZT seen by the positron.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00696293
Permalink