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| 1 | Mechanism of CeMgAl_(11)O_(19):Tb^(3+) alkaline fusion with sodium hydroxide显示文摘Comprehensive CeMgAl11O19:Tb3+(CTMA)disintegration via alkaline fusion was discussed. The rare earth(RE) elements in CTMA were dissolved by HCl completely after alkaline fusion. Relationships between the alkaline fusion temperature and various properties of the compounds were examined by various techniques to elucidate their roles in the expected CTMA disintegration.X-ray diffraction(XRD) analysis indicates the phase transformation sequence. A scientific hypothesis of crystal structure disintegration presents that sodium ions substitute for the europium and barium ions in the mirror plane and magnesium ions in the spinel block successively, resulting in that more oxygen vacancies and interstitial sodium ions appear. The unit cell [P63/mmc(194)] breaks from the mirror plane. Then it is decomposed into Na Al O2, and magnesium, cerium, and terbium ions combine with free OH-into Mg O, Tb2O3 and CeO2;Tb2O3 and CeO2 change into Ce0.6Tb0.4O2-x. In the end, the rare earth oxide is recycled easily by the acidolysis. The mechanism provides fundamental basis for recycling of REEs from waste phosphors. | Hu Liu Shen-Gen Zhang De-An Pan Yi-Fan Liu Bo Liu Jian-Jun Tian Alex A.Volinsky | 2015 | Rare Metals2015，34，3： | 1 |
| 2 | Magnetoresistive properties of Ni-doped La_(0.7)Sr_(0.3)MnO_3 manganites显示文摘La_(0.7)Sr_(0.3)Mn_(1-x)Ni_xO_3(x = 0, 0.025, 0.050 and 0.075) ceramics were prepared by the conventional solid-state reaction method. The partial substitution of Mn by Ni^(2+) leads to a decrease in cell volume as well as a structural transition from the rhombohedral to the orthorhombic structure. Ni^(2+) doping increases the electrical resistivity, decreases the semiconductor–metal transition temperature(Tms) and relatively enhances the room temperature magnetoresistance(MR), especially in x = 0.025 and around Tms. With respect to conduction mechanism, the small polaron hopping(SPH) and the variable range hopping(VRH) models were used to examine conduction in the semiconducting region. | Ahmed Mohamed Ahmed Abd El-Moez Ahmed Mohamed Medhat Abdelrady Abdellateef Hassan Ahmed Abd El-Ghanny | 2016 | Rare Metals2016，35，7： | 1 |
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