Open AccessUARIATION OF Pr VALENCE VALUE VERSUS OXYGEN CONTENT IN PrBa2Cu3O6+x(x=1,0.3)
Author(s) -
Hongjuan Ye,
Biao Li,
Zhifeng Li,
Ge Xiong,
Ruilan Wang,
Hongcheng Li,
Peng Liu
Publication year - 1998
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.47.1361
Subject(s) - valence (chemistry) , phonon , rare earth , materials science , ceramic , oxygen , crystallography , spectral line , analytical chemistry (journal) , chemistry , condensed matter physics , physics , metallurgy , organic chemistry , chromatography , astronomy
The infrared spectra of PrBa2Cu3O6+x (x=1, 0.3) ceramics and films with c-axis orientation are reported in this paper, and the phonon modes in c-axis and ab-plane are distinguished by treating the different vibrational behaviour for film and ceramic samples. Due to the fact that PrBa2Cu3O6+x possesses the similar crystal structure as RBa2Cu3O6+x (R=Y and other rare earth elements), by comparing the phonon spectra, espeacially the B1u (x=1), Eu and A2u (x=0.3) modes of Pr, Y and other rare earth elements, it is found that the valence value of Pr depends on the oxygen content, i.e., the Pr valence is 3+ in PrBa2Cu3O6.3 while it is larger then 3+ in PrBa2Cu3O7.