Abstract
In this study, aluminum oxy-hydroxide (boehmite) was synthesized using the co-precipitation method and two phases gamma and alpha alumina were prepared from boehmite by increasing temperature. Subsequently, three phases were tested by different characterizing methods such as XRD, BET, and positron-based spectroscopies. Using XRD and BET, changes in crystalline structure and pore structures (pore size, morphology, and pore size distribution) versus temperature were investigated. The positron annihilation lifespan spectrometer (PALS) and the coincidence Doppler expansion spectrometer (CDBS) were used to study defects in the crystal structure due to temperature rise. The results show that with increase in temperature the type and amount of structural defects change. Also, the ratio of increasing the lifetime of positron annihilation to the phase change of the crystal lattice from the boehmite to the alpha is significant. In other words, in the boehmite, the first-lifetime component (τ1) due to the increase in temperature from 150 °C to 250 °C increases by about 105% and then in the initial phase starting of the γ-alumina phase (550 °C) decreases by about 111% and this value for the alpha phase (1150 °C) reaches 348%. Using the Tao–Eldrup mathematical model, the lifetime of the positron and how it is trapped in the defects of lattice structures in all three main phases were explored. The CDB ratio curves, especially in the momentum area of 2p oxygen electrons, indicate that the crystal lattice structure changes from cubic to hexagonal.
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Appendix
Appendix
Symbol | Expression |
---|---|
λ | Decay constant |
σ | Statistical weight |
E 1,2 | Photon energy |
E p | Positron energy |
x nl | n-node of Bessel function j |
y nm | n-node of Bessel function Jm |
ε | Empirical parameter |
P | Instrumental resolution function |
I | Relative intensity of spectrum |
τ | Lifetime |
D | Pore radii |
m 0 | Rest mass of electron |
c | Velocity of light |
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Ghasemifard, M., Ghamari, M. Probing the influence of temperature on defects in oxy-hydroxide ceramics by positron annihilation lifetime and coincidence Doppler broadening spectroscopy. Appl. Phys. A 128, 180 (2022). https://doi.org/10.1007/s00339-022-05323-4
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DOI: https://doi.org/10.1007/s00339-022-05323-4