1. Li3[Al(PO4)2(H2O)1.5] and Na[AlP2O7]: from 2D layered polar to 3D centrosymmetric framework structures.
- Author
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Li, Xinlei, Zhang, Yang, Pan, Yang, Hao, Yucheng, Lin, Yuan, Li, Haijian, Li, Minghua, Fan, Changzeng, and Alekseev, Evgeny V.
- Subjects
STRUCTURAL frames ,SPACE groups ,TETRAHEDRA ,INFRARED spectroscopy ,ELEMENTAL analysis ,ALKALI metals - Abstract
Two novel alkali metal aluminophosphates, namely, Li
3 [Al(PO4 )2 (H2 O)1.5 ] and Na[AlP2 O7 ], were synthesized through low-temperature flux methods. They crystallized in the P4 and C2/c space groups, respectively. Both structures of Li3 [Al(PO4 )2 (H2 O)1.5 ] and Na[AlP2 O7 ] were built up by AlO6 octahedra and PO4 tetrahedra. The structure of Li3 [Al(PO4 )2 (H2 O)1.5 ] was composed of novel two-dimensional (2D) aluminophosphate layers, which contained two types of eight-membered rings (8-MRs) along the c-axis. The structure of Na[AlP2 O7 ] featured a unique 3D anionic framework composed of corner-sharing isolated AlO6 octahedra and PO4 tetrahedra. Three intersecting tunnels along the [001], [110], and [101] directions could be observed. Importantly, the material Li3 [Al(PO4 )2 (H2 O)1.5 ] crystallized in the polar space group P4, showing a moderate second-harmonic generation (SHG) effect. Moreover, Na[AlP2 O7 ] exhibited a wide transparency range with a short ultraviolet (UV) cut-off edge (∼190 nm), which indicated its potential application in the deep-UV region. Herein, the syntheses and topological structures of Li3 [Al(PO4 )2 (H2 O)1.5 ] and Na[AlP2 O7 ], as well as elemental analysis, thermal stability, infrared spectroscopy, UV-vis diffuse reflectance, structural properties, and nonlinear optical (NLO) properties are also discussed. [ABSTRACT FROM AUTHOR]- Published
- 2022
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