Open AccessSystematics of positron lifetime spectroscopy measurements in ferroelectrics
Author(s) -
S. Peneva,
T. Troev,
B. Kolev
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1555/1/012036
Subject(s) - positron , positronium , ferroelectricity , materials science , spectroscopy , irradiation , ion , positron annihilation spectroscopy , analytical chemistry (journal) , chemistry , positron annihilation , electron , physics , optoelectronics , nuclear physics , organic chemistry , quantum mechanics , dielectric , chromatography
In the paper is demonstrated the use of positron lifetime spectroscopy (PLS) in a comparative study of the results in ferroelectrics. The first part is devoted to the application of PLS as a probe for measurements of ferroelectrics. In Triglycine Sulphate (TGS) (NH 3 CH 2 COOH) 3 H 2 SO 4 , Rochelle Salt (RS) NaKC 4 H 4 O 6 4H 2 O and Potassium Dihydrogen Phosphate (KDP) KH 2 PO 4 at different temperatures and gamma irradiation doses is established the existence of three positron lifetime components. This experimental results show that the second long lifetime component as a function of temperature in order-disorder ferroelectrics TGS, RS and KDP is due to the positron trapping in negatively charge defects of ferroelectric. The positron spectroscopy method is effective for measurements of extremely small defects and voids, which is important for the next exploitation period of the ferroelectrics. PLS measurements of ferroelectrics show that about the third lifetime component is due to the local formation of orhto-positronium state on the boundary between the domains. In the second part the PLS analysis has been applied for examination the electronic and defect structure in selected ferroelectrics materials. In gamma irradiated TGS positrons are trapped in the defect states of the oxygen ions of the two radicals CH 2 COO - and NH 3 CHCOO - . In RS positrons are trapped also in the defect states of the oxygen ions and OH groups.