TY - JOUR
T1 - Gas effusion spectra o
AU - Hamed, A.
AU - Ortiz, R.
AU - Feng, H.
AU - Li, Z.
AU - Hor, P.
AU - Xue, Y.
AU - Sun, Y.
AU - Xiong, Q.
AU - Cao, Y.
AU - Chu, C.
N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.
PY - 1996
Y1 - 1996
N2 - Gas effusion spectra have been obtained in the temperature range 30-1000 °C for underdoped, optimized, and overdoped (Formula presented)(Formula presented) samples. We observe a large oxygen multipeak structure at high temperatures and a wide low-intensity oxygen “tail” at lower temperatures. The two lowest-temperature oxygen peaks are believed to originate from bonding sites for excess oxygen. The δ values derived from these two peaks are consistent with δ values derived from neutron powder diffraction (NPD). The wide low-temperature oxygen tail in the effusion spectra suggests the existence of loosely bound disordered oxygen in overdoped samples and accounts for the discrepancy between δ values determined by NPD and thermogravimetry analysis. Our results provide further evidence that each doping oxygen atom contributes, on average, only about one carrier to the (Formula presented) plane in (Formula presented)(Formula presented).
AB - Gas effusion spectra have been obtained in the temperature range 30-1000 °C for underdoped, optimized, and overdoped (Formula presented)(Formula presented) samples. We observe a large oxygen multipeak structure at high temperatures and a wide low-intensity oxygen “tail” at lower temperatures. The two lowest-temperature oxygen peaks are believed to originate from bonding sites for excess oxygen. The δ values derived from these two peaks are consistent with δ values derived from neutron powder diffraction (NPD). The wide low-temperature oxygen tail in the effusion spectra suggests the existence of loosely bound disordered oxygen in overdoped samples and accounts for the discrepancy between δ values determined by NPD and thermogravimetry analysis. Our results provide further evidence that each doping oxygen atom contributes, on average, only about one carrier to the (Formula presented) plane in (Formula presented)(Formula presented).
UR - http://www.scopus.com/inward/record.url?scp=0010104712&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0010104712&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.54.682
DO - 10.1103/PhysRevB.54.682
M3 - Article
AN - SCOPUS:0010104712
SN - 1098-0121
VL - 54
SP - 682
EP - 687
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 1
ER -