- 作者: 李光華 ; 王瑤珮 ; 鄭志義 等
- 作者服務機構: 中央研究院化學研究所
- 中文摘要: The crystal structure of Rb/sub 2/V/sub 3/P/sub 4/O/sub 17/ has been determined from single-crystal X-ray diffraction data. Rb/sub 2/V/sub 3/P/sub 4/O/sub 17/ crystallizes in the orthorhombic space group Pnma (No.62) with a=17.502(7), b=7.292(2), c= 11.399(6).ANG., V=1455(1).ANG./sup 3/, Z=4, R=0.0295, R/sub w/=0.0320 for 1129 unique reflections with I>2.5.sigma.(I). The structure contains intersecting tunnels where the Rb/sup +/ cations are located. The framework can be described as consisting of V/sub 2/O/sub 10/ units formed from one VO/sub 5/ square pyramid and one VO/sub 6/ octahedron sharing a corner, and infinite chains of corner-shared VO/sub 6/ octahedra, which are linked in three dimensions by pyrophosphate groups. The structural formula is Rb/sub 2/(VO)/sub 3/(P/sub 2/O/sub 7/)/sub 2/. A single-phase product can be obtained by heating appropriate amounts of Rb/sub 4/V/sub 2/O/sub 7/, VO/sub 2/, V, and P/sub 2/O/sub 5/ in an evacuated fused silica tube at 950.degree.C. Powder magnetic susceptibility data confirm the presence of V/sup 4+/ (d/sup 1/) ions without magnetic ordering down to 3 K.
- 英文摘要: --
- 中文關鍵字: Vanadium Phosphate; Crystal Structure; Magnetic Property
- 英文關鍵字: 磷酸釩;磁學性質;晶體構造