We synthesize continuous solid solutions with monophasic zircon-type structure of vanadates of formula YxBi0.95 VO4：0.05Dy^3＋ （x = 0-0.95） using a combined method of co-precipitation and hydrothermal synthesis. Th...We synthesize continuous solid solutions with monophasic zircon-type structure of vanadates of formula YxBi0.95 VO4：0.05Dy^3＋ （x = 0-0.95） using a combined method of co-precipitation and hydrothermal synthesis. The X-ray diffractometer patterns confirm the formation of a solid solution of YBi0.95-xVO4：0.05Dy^3＋, and the results show that all the samples have monophasic zircon-type structure. The absorption spectra of the prepared phosphors show a blue-shift of the fundamental absorption band edge with increasing Y^3＋ content. An intense tunable characteristic emission of Dy^3＋ is observed with the increasing ratio of Y/Bi. Finally, the mechanism of luminescence of Dya＋ in the YBi0.95 VO4：0.05Dya＋ （x = 0-0.95） solid solution is analyzed and discussed.展开更多
Since the discovery of high-T<sub>c</sub> superconductors, additions of proper elements to YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> system have been proved to be qu...Since the discovery of high-T<sub>c</sub> superconductors, additions of proper elements to YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> system have been proved to be quite effective in both mechanism researches and improvements of sample preparation technique. Recently, an interesting phenomenon in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> was reported by Feng Yong et al., i.e. when being doped with appropriate amounts of V<sub>2</sub>O<sub>5</sub>, samples which have been quenched in air from 900℃ to展开更多
基金supported by the National 973 P rogram of China(No.2011CB211708)the National Natural Science Foundation of China(Nos.51272097,61265004,and 61307111)
文摘We synthesize continuous solid solutions with monophasic zircon-type structure of vanadates of formula YxBi0.95 VO4：0.05Dy^3＋ （x = 0-0.95） using a combined method of co-precipitation and hydrothermal synthesis. The X-ray diffractometer patterns confirm the formation of a solid solution of YBi0.95-xVO4：0.05Dy^3＋, and the results show that all the samples have monophasic zircon-type structure. The absorption spectra of the prepared phosphors show a blue-shift of the fundamental absorption band edge with increasing Y^3＋ content. An intense tunable characteristic emission of Dy^3＋ is observed with the increasing ratio of Y/Bi. Finally, the mechanism of luminescence of Dya＋ in the YBi0.95 VO4：0.05Dya＋ （x = 0-0.95） solid solution is analyzed and discussed.
文摘Since the discovery of high-T<sub>c</sub> superconductors, additions of proper elements to YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> system have been proved to be quite effective in both mechanism researches and improvements of sample preparation technique. Recently, an interesting phenomenon in YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-δ</sub> was reported by Feng Yong et al., i.e. when being doped with appropriate amounts of V<sub>2</sub>O<sub>5</sub>, samples which have been quenched in air from 900℃ to
