Abstract:Transparent Ce:YAG ceramics were fabricated by the solid-state reaction method with an additional round of pre-calcining using nanopowders of Ce 2x Y 2−2x O 3 (x = 0.001, 0.01, 0.03 and 0.05) and Al 2 O 3 synthesized by laser ablation. Additional pre-calcining of the nanopowder mixture in air was used to partially transform the oxides into the YAG phase before sintering. The transmittance of the obtained 2-mm-thick Ce:YAG ceramics was over 81 % in the wavelength range of 500-900 nm. The average volumes of the … Show more
“…However, in inorganic matrices, prepared by sol–gel method, the synthesized optically opaque gel reduces significantly scintillation output. Furthermore, successfully preparing YAG:Ce 3+ nanocrystalline scintillator powders can be used to fabricate the same phosphor in transparent ceramic form, [ 15 ] which can replace single crystals. In addition, the new generation of scintillation detectors designed to be applied in devices for medical diagnostics, safety inspections, and radiation monitoring of nuclear reactors are based on nanoscintillators powders.…”
Radiation detection is important in several fields, including defense, medicine (e.g., PET, CT scans), material testing, environmental hazard monitoring, security checks at harbors, airports, and borders. [1] Scintillator materials are used as radiation sensors for many gamma ray and X-ray applications. [2][3][4] In order to develop faster and more efficient methods for radiation detection, progress in materials is a critical component of any successful strategy. The physical and luminescent properties of scintillator materials are very sensitive to the synthesis parameters, [5,6] and these characteristics must be tailored to satisfy the specific requirements for each application. Currently, Na(Tl) and CsI(Tl) single crystal scintillators are widely used in nuclear spectroscopy and radiation detection. Moreover, many types of scintillators have been investigated such as alkali, alkaline earth as BaF 2 :Ce, CaF
“…However, in inorganic matrices, prepared by sol–gel method, the synthesized optically opaque gel reduces significantly scintillation output. Furthermore, successfully preparing YAG:Ce 3+ nanocrystalline scintillator powders can be used to fabricate the same phosphor in transparent ceramic form, [ 15 ] which can replace single crystals. In addition, the new generation of scintillation detectors designed to be applied in devices for medical diagnostics, safety inspections, and radiation monitoring of nuclear reactors are based on nanoscintillators powders.…”
Radiation detection is important in several fields, including defense, medicine (e.g., PET, CT scans), material testing, environmental hazard monitoring, security checks at harbors, airports, and borders. [1] Scintillator materials are used as radiation sensors for many gamma ray and X-ray applications. [2][3][4] In order to develop faster and more efficient methods for radiation detection, progress in materials is a critical component of any successful strategy. The physical and luminescent properties of scintillator materials are very sensitive to the synthesis parameters, [5,6] and these characteristics must be tailored to satisfy the specific requirements for each application. Currently, Na(Tl) and CsI(Tl) single crystal scintillators are widely used in nuclear spectroscopy and radiation detection. Moreover, many types of scintillators have been investigated such as alkali, alkaline earth as BaF 2 :Ce, CaF
Предмет исследования. Исследовано влияние концентрации сульфата аммония на содержание примесей, морфологию и степень агломерации порошков оксигидратов и керамических порошков. Метод. Синтез порошков-прекурсоров осуществляли методом обратного гетерофазного осаждения из хлоридов. Для анализа динамики изменения концентрации примесей хлора и серы в порошках оксигидратов и керамических порошках применяли метод энергодисперсионного анализа элементного состава. Морфологию экспериментальных образцов оценивали по данным растровой электронной микроскопии. Установление зависимости степени агломерации керамических порошков от концентрации сульфата аммония осуществляли с применением методов рентгенофазового анализа и газовой адсорбции Брунауэра, Эммета и Теллера. Основные результаты. Обнаружено, что применение сульфата аммония позволяет не только снизить степень агломерации керамических порошков на два порядка, но также уменьшает концентрацию примеси хлора с 0,2 до менее 0,01 ат. %. Кроме того, выявлена возможность управления величиной удельной площади поверхности в диапазоне 1,5-15 м 2 /г путем изменения концентрации сульфата аммония. Практическая значимость. С применением усовершенствованной методики синтеза керамических порошков получены образцы оптической керамики со светопропусканием в видимом и ближнем инфракрасном диапазоне более 70 % без учета полос поглощения иттербия.
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