S&M Young Researcher Paper Award 2020
Recipients: Ding Jiao, Zao Ni, Jiachou Wang, and Xinxin Li [Winner's comments]
Paper: High Fill Factor Array of Piezoelectric Micromachined
Ultrasonic Transducers with Large Quality Factor

S&M Young Researcher Paper Award 2021
Award Criteria
Notice of retraction
Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
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Positron-induced Radiophotoluminescence in Ag-doped Glasses

Hirokazu Masai, Yuka Yanagida, Hiroki Kawamoto, Yasuhiro Koguchi, Masanori Koshimizu, and Masato Yamawaki

(Received October 13, 2021; Accepted November 30, 2021)

Keywords: positron, glass, silver, radiophotoluminescence, electron spin resonance

Positron annihilation spectroscopy (PAS) is used for the quantification of cavities in a matrix. Although PAS is sometimes considered a non-destructive measurement method, it is worth investigating the interaction of positrons with the matrix during PAS. Here, we have demonstrated that defects are generated in silver-doped phosphate glasses during positron annihilation measurement and that radiophotoluminescence (RPL) is observed after irradiation. There is a linear correlation between the irradiation duration and the observed RPL intensity of the glasses. We observed RPL after a high irradiation dose even after conventional thermal annealing at 360 C for 1 h. The formation of Ag2+ species detectable by electron spin resonance was confirmed. Based on the concentration of ESR-active Ag2+ and Ag2+ species, it is expected that approximately 0.1% of Ag+ cations were changed after 5 days of positron irradiation.

Corresponding author: Hirokazu Masai

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