Abstract
Scintillation Properties of Yttrium-stabilized Zirconia Crystals Synthesized by the Floating-zone Method
Highlights
Scintillators are a kind of phosphor material, and they convert ionizing radiation (e.g., X- and β-rays) immediately to several thousands of low-energy photons such as ultraviolet and visible light.[1,2] The application fields of scintillators are very wide, including medical imaging,(3) security,(4) oil logging,(5) environmental monitoring,(6) and high-energy physics.[7]
ZrO2 is a wide-band-gap (5.0–5.5 eV) transition metal oxide with useful mechanical, thermal, optical, and electrical properties.[9,10] ZrO2 is used in various applications including semiconductor substrates,(11) optical barrier coatings,(12,13) high temperature solidoxide fuel cells and oxygen sensors,(14–16) and the surface of nuclear fuel rods.[17,18] The stable phases of ZrO2 are different between room and high temperatures,(19,20) and this structural property causes a destruction of the bulk form of ZrO2 when it is exposed to a great change in temperature
The ZrO2 and YSZ (Zr:Y = 95:5, 92.5:7.5, 90:10 mol%) samples used in this study were synthesized by the floating zone (FZ) method using four Xe lamps.[30]. The material powders were ZrO2 (4N) and Y2O3 (4N), and they were mixed to the above compositions
Summary
Scintillators are a kind of phosphor material, and they convert ionizing radiation (e.g., X- and β-rays) immediately to several thousands of low-energy photons such as ultraviolet and visible light.[1,2] The application fields of scintillators are very wide, including medical imaging,(3) security,(4) oil logging,(5) environmental monitoring,(6) and high-energy physics.[7]. In order to resolve the problem, additives such as yttrium, magnesium, and calcium oxide are used These additives adjust the crystallographic structure by introducing oxygen vacancies and alter the electronic structure. The introduction of vacancies and changes in crystallographic and electronic structures) leads to some useful carrier transport, chemical, and optical properties.[16,21,22,23] From the viewpoint of optical applications, up to now, photoluminescence (PL) properties of ZrO2 and yttria-stabilized ZrO2 (YSZ or Y2O3-ZrO2) have been reported.[10,24,25] YSZ is well known as one of the good phosphors.[26,27] YSZ has a high density of 6 g/cm so it has a high stopping power for radiation and absorbs radiation energy effectively. In order to reveal the performance as a radiation detector, we synthesized ZrO2 and YSZ crystals by the floating zone (FZ) method and evaluated their scintillation and thermally stimulated luminescence (TSL) properties
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