Vacancy Related Defects in La0.5Sr0.5CoO3-δ Thin Films

1997 ◽  
Vol 474 ◽  
Author(s):  
D. J. Keeble ◽  
S. Madhukar ◽  
B. Nielsen ◽  
A. Krishnan ◽  
P. Asoka-Kumar ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Vacancy ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Positron Beam ◽  
Vacancy Cluster ◽  
Oxygen Nonstoichiometry ◽  
Positron Trapping ◽  
Variable Energy ◽  
Trapping Sites

ABSTRACTLaser ablated La0.5Sr0.5CoO3-δ thin films have been studied by Doppler-broademng-detected positron annihilation using a variable-energy positron beam. The oxygen partial pressure during cooling from the growth temperature was altered through the range 760 torr to 10−5 torr to change the oxygen non-stoichiometry of the films.The measured Doppler broadened lineshape parameter S was found to increase with increasing oxygen nonstoichiometry. For films cooled with an oxygen partial pressure of ≤ 10−4 Torr positron trapping to monovacancy type defects is infered. It is proposed that Sr ion oxygen vacancy complexes are likely trapping sites.For the film cooled in 10−5 torr oxygen the magnitude of the increase in S, with respect to that measured from the film cooled in 760 Torr oxygen, showed positron trapping to vacancy cluster defects is occuring.

scholarly journals Effect of Oxygen Partial Pressure on Crystal Structure, Oxygen Vacancy, and Surface Morphology of Epitaxial SrTiO3 Thin Films Grown by Ion Beam Sputter Deposition

Oxygen ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 62-72
Author(s):  
Gasidit Panomsuwan ◽  
Nagahiro Saito
Keyword(s):  
Crystal Structure ◽  
Thin Films ◽  
Oxygen Vacancy ◽  
Surface Morphology ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Ion Beam ◽  
Compressive Strain ◽  
Sputter Deposition ◽  
Ion Beam Sputter Deposition

Epitaxial SrTiO3 (STO) thin films were grown on (001)-oriented LaAlO3 (LAO) substrates at 800 °C by an ion beam sputter deposition (IBSD). Oxygen partial pressure (PO2) was varied at 1.5 × 10−5, 1.5 × 10−4, and 1.5 × 10−3 Torr during the growth. The effects of PO2 on crystal structure, oxygen vacancy, and surface morphology of the STO films were investigated and are discussed to understand their correlation. It was found that PO2 played a significant role in influencing the crystal structure, oxygen vacancy, and surface morphology of the STO films. All STO films grew on the LAO substrates under a compressive strain along an in-plane direction (a- and b-axes) and a tensile strain along the growth direction (c-axis). The crystalline quality of STO films was slightly improved at higher PO2. Oxygen vacancy was favorably created in the STO lattice grown at low PO2 due to a lack of oxygen during growth and became suppressed at high PO2. The existence of oxygen vacancy could result in a lattice expansion in both out-of-plane and in-plane directions due to the presence of Ti3+ instead of Ti4+ ions. The surface roughness of the STO films gradually decreased and was nearly close to that of the bare LAO substrate at high PO2, indicating a two-dimensional (2D) growth mode. The results presented in this work provide a correlation among crystal structure, oxygen vacancy, and surface morphology of the epitaxial STO films grown by IBSD, which form a useful guideline for further study.

Highly conductive AZO thin films obtained by rationally optimizing substrate temperature and oxygen partial pressure

2017 ◽  
Vol 644 (1) ◽  
pp. 190-196 ◽  
Author(s):  
Yong Zeng ◽  
Zhiqiang Fang ◽  
Honglong Ning ◽  
Feng Zhu ◽  
Xianzhe Liu ◽  
...  
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Oxygen Partial Pressure ◽  
Partial Pressure

Behavior of dual ion beam sputtered MgZnO thin films for different oxygen partial pressure

2013 ◽  
Vol 25 (2) ◽  
pp. 772-777 ◽  
Author(s):  
Saurabh Kumar Pandey ◽  
Sushil Kumar Pandey ◽  
Vishnu Awasthi ◽  
Ashish Kumar ◽  
M. Gupta ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Ion Beam

Effect of annealing and oxygen partial pressure on the RF sputtered WO3 thin films for electrochromic applications

2021 ◽  
Author(s):  
K Naveen Kumar ◽  
Habibuddin Shaik ◽  
Amulya Pawar ◽  
L.N. Chandrashekar ◽  
Sheik Abdul Sattar ◽  
...  
Keyword(s):  
Thin Films ◽  
Oxygen Partial Pressure ◽  
Partial Pressure ◽  
Wo3 Thin Films
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