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Davood Raoufi

Davood Raoufi

Academic rank: Associate Professor
ORCID:
Education: PhD.
ScopusId: 20434506200
HIndex:
Faculty: Faculty of Science
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Phone:

Research

Title
Crystallography characteristics of tetragonal nano-zirconia films under various oxygen partial pressure
Type
JournalPaper
Keywords
Zirconia thin films; oxygen partial pressure; crystallite size; atomic force microscopy; surface roughness; correlation function
Year
2019
Journal SURFACE ENGINEERING
DOI
Researchers Leila Eftekhari ، Davood Raoufi

Abstract

Structural features and surface morphology of ZrO2 thin films electron beam evaporationdeposited under various oxygen partial pressure were studied. It was indicated tetragonal phase for all samples by XRD pattern. The highest crystallite size calculated via Scherrer equation is observed at the oxygen partial pressure of 7 × 10−3 mbar; that was in good agreement with the high-resolution surface images obtained by FE-SEM. The photoluminescence spectrum of t-zirconia films exhibits an intense peak at 351 nm, this emission decrease in intensity by elevation of oxygen partial pressures. Surface roughness profile and scaling analyses were made by surface measurements of atomic force microscopy with using the height-height correlation function. The roughness has the maximum value at the highest oxygen partial pressure. It has been found that with the increase of oxygen partial pressures, lateral correlation length of samples increased, and fractal dimension changed within the range of 2.20–2.26.