Scintillating materials, which can convert high energy X-ray radiation into visible luminescence [1], are crucial parts of Xray imaging technology. Since the discovery of X-ray in 1895, scintillating materials have wi...Scintillating materials, which can convert high energy X-ray radiation into visible luminescence [1], are crucial parts of Xray imaging technology. Since the discovery of X-ray in 1895, scintillating materials have witnessed wild applications in various fields, including security inspection, space exploration, nondestructive detection, and medical diagnostics [2,3]- Conventional scintillators are generally large inorganic crystals and can only be grown at high temperature, which significantly increases the manufacturing difficulty and cost. The luminescence of current crystal scintillators is usually limited by lowefficiency or afterglow effects, and is difficult to be tuned cross the visible spectrum. As traditional scintillators have reached their performance limits, exploration of new scintillators has become a crucial topic considering the increased demands of X-ray imaging and detection technology [4-6].展开更多
Knowledge of the kinetics and mechanism of BaMgAl10017：Eu2＋ （BAM） fusion with sodium hydroxide will benefit recy- cling rare earth elements （REEs） from the waste phosphors. The reaction temperature range of 290-...Knowledge of the kinetics and mechanism of BaMgAl10017：Eu2＋ （BAM） fusion with sodium hydroxide will benefit recy- cling rare earth elements （REEs） from the waste phosphors. The reaction temperature range of 290-375 ~C and the reaction mecha- nism were determined using X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Activation energy was determined by the four model-free methods, and calculated results showed that the Kissinger method value of 579.5 KJ/mol was close to the average value of the Kissinger-Akahira-Sunose （KAS） and the Flynn-Wall-Ozawa （FWO） methods of 563.5 kJ/mol. The calculated activation energy variation tendency versus conversion factor agreed with the proposed mechanism.展开更多
文摘Scintillating materials, which can convert high energy X-ray radiation into visible luminescence [1], are crucial parts of Xray imaging technology. Since the discovery of X-ray in 1895, scintillating materials have witnessed wild applications in various fields, including security inspection, space exploration, nondestructive detection, and medical diagnostics [2,3]- Conventional scintillators are generally large inorganic crystals and can only be grown at high temperature, which significantly increases the manufacturing difficulty and cost. The luminescence of current crystal scintillators is usually limited by lowefficiency or afterglow effects, and is difficult to be tuned cross the visible spectrum. As traditional scintillators have reached their performance limits, exploration of new scintillators has become a crucial topic considering the increased demands of X-ray imaging and detection technology [4-6].
基金supported by the National Natural Science Foundation of China(U1360202,51472030)the National Hi-tech R&D Program of China(2012AA063202)+3 种基金the National Key Project of the Scientific&Technical Support Program of China(2011BAE13B07,2012BAC02B01,2011BAC10B02)the Fundamental Research Funds for the Central Universities(FRF-TP-14-043A1)the China Postdoctoral Science Foundation(2014M560885)the Beijing Nova Program(Z141103001814006)
文摘Knowledge of the kinetics and mechanism of BaMgAl10017：Eu2＋ （BAM） fusion with sodium hydroxide will benefit recy- cling rare earth elements （REEs） from the waste phosphors. The reaction temperature range of 290-375 ~C and the reaction mecha- nism were determined using X-ray diffraction, scanning electron microscopy and differential scanning calorimetry. Activation energy was determined by the four model-free methods, and calculated results showed that the Kissinger method value of 579.5 KJ/mol was close to the average value of the Kissinger-Akahira-Sunose （KAS） and the Flynn-Wall-Ozawa （FWO） methods of 563.5 kJ/mol. The calculated activation energy variation tendency versus conversion factor agreed with the proposed mechanism.
