Effect of doping of trivalent cations Ga 3+ , Sc 3+ , Y 3+ in Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) system on Li + ion conductivity
作者:Dharmesh H. Kothari、D.K. Kanchan
DOI:10.1016/j.physb.2016.08.020
日期:2016.11
Abstract We report the effect of trivalent cations dopants in the Li 1.3 Al 0.3− x R x Ti 1.7 (PO 4 ) 3 (R=Ga3+ , Sc 3+ , Y 3+ ) NASICON ceramic system in the concentration range x =0.01,0.03,0.05,0.07, on the Li + ion conducting properties using impedance spectroscopy. The samples were prepared by solid state reaction method and characterized by X-Ray Diffraction and density measurements. The electrical
摘要 我们报道了三价阳离子掺杂剂在浓度范围 x = 0.01,0.03,0.05,0.07,使用阻抗谱对Li+离子的导电性能进行了研究。样品通过固态反应法制备,并通过 X 射线衍射和密度测量进行表征。使用阻抗谱在 10 Hz 至 20 MHz 频率范围和 303 K 至 423 K 温度范围内研究电性能。尽管材料的孔隙率随着掺杂而降低,但系统的整体 Li + 离子电导率并未随着掺杂而提高。发现掺杂剂阳离子的离子半径是形成杂质相和低Li + 离子电导率的重要因素。
M(IO<sub>3</sub>)(HPO<sub>4</sub>)(H<sub>2</sub>O) (M = Sc, Fe, Ga, In): Introduction of Phosphate Anions into Metal Iodates
作者:Tong-Ying Chang、Bing-Ping Yang、Chun-Li Hu、Dong Yan、Jiang-Gao Mao
DOI:10.1021/acs.cgd.7b00924
日期:2017.9.6
The first series of metal phosphate iodates, namely, M(IO3)(HPO4)(H2O) (M = Sc 1, Fe 2, Ga 3, In 4), have been obtained through hydrothermal syntheses. The title compounds are isomorphic and crystallize in the monoclinic space group C2/c (No. 15). Their structures feature a three-dimensional (3D) network composed of 1D [M(HPO4)(H2O)]+ chains that are further bridged by IO3 groups, forming 1D tunnels
modifications, according to previous works on uranium and thorium IV homologues that evidenced a contracting effect of big cations. However, the present study shows that the only isovalent cations likely to substitute for Zr IV or P V are either harmful, or unstable, chemically or thermally. Furthermore, aliovalent modifications seem to be forbidden by the crystal structure of the material, leaving probably very
摘要 β-Zr 2 O(PO 4 ) 2 的超低热膨胀仍然可以通过化学修饰来降低,根据之前对铀和钍 IV 同系物的研究证明了大阳离子的收缩效应。然而,目前的研究表明,唯一可能替代 Zr IV 或 PV 的等价阳离子要么有害,要么在化学或热方面不稳定。此外,材料的晶体结构似乎禁止异价修饰,因此改进的前景可能很少。然而,钒显着提高了材料的结晶度并降低了 α-β 转变温度。
Luminescence and energy transfer of a color tunable phosphor: Tb<sup>3+</sup> and Eu<sup>3+</sup> co-doped ScPO<sub>4</sub>
energy transferbetweenTb3+ and Eu3+ are analyzed systematically. The cross relaxation from 5D3 to 5D4 of single doped Tb3+ in the host is investigated. The energy transferbetweenTb3+ and Eu3+ has been demonstrated by the decay times, which are ascribed to the dipole–dipole (d–d) mechanism, and the ηT reaches 54.4%. Additionally, the energy transfer critical distance betweenTb3+ and Eu3+ was calculated
通过高温固相反应制备了一系列新型的可调发射ScPO 4:x Tb 3+,y Eu 3+荧光粉。使用X射线衍射精制检查相纯度。X射线光电子能谱(XPS)和晶体信息,发光性质和Tb 3+和Eu 3+之间的能量转移进行了系统地分析。研究了主体中单一掺杂的Tb 3+从5 D 3到5 D 4的交叉弛豫。Tb 3+与Eu 3+之间的能量转移已经由衰减时间,这是归因于偶极-偶极(d-d)机制证实的,和η Ť达到54.4%。另外,Tb 3+和Eu 3+之间的能量转移临界距离经计算约为12.95Å。通过调整Tb 3+ / Eu 3+的比例,可以将发射颜色从绿色变为黄色到橙红色。ScPO 4:0.03Tb 3+,0.025Eu 3+具有良好的热稳定性,表明其在w-LED应用中具有巨大的潜力。
Mel'nikov, P. P.; Kalinin, V. B.; Efremov, V. A., Inorganic Materials, 1981, vol. 17, p. 1085 - 1087
作者:Mel'nikov, P. P.、Kalinin, V. B.、Efremov, V. A.、Komissarova, L. N.