A new layered mixed-valent potassium vanadium selenite, KV{sub 2}SeO{sub 7}
Journal Article
·
· Inorganic Chemistry
OSTI ID:160101
- Sung Kyun Kwan Univ., Suwon (Korea, Republic of)
- Kookmin Univ., Seoul (Korea, Republic of); and others
A new layered mixed-valent compound, KV{sub 2}SeO{sub 7}, has been hydrothermally synthesized from V{sub 2}O{sub 5}, V{sub 2}O{sub 3}, SeO{sub 2}, and KOH with mole ratios of 2:2:15:15 or 3:1:15:15 (in millimoles) in 12 mL of H{sub 2}O at 230{degrees}C. Slight changes of the reaction conditions yielded different phases as impurities. The crystal structure has been determined from single-crystal X-ray diffraction. KV{sub 2}SeO{sub 7} crystallizes in the orthorhombic space group Pnma (no. 62) with a = 17.954(8), b = 5.360(3), and c = 6.971(3) {Angstrom}, V = 670.8(6) {Angstrom}{sup 3}, Z = 4, R = 0.0459. The structure is composed of alternating K{sup +} and [V{sub 2}SeO{sub 7}]{sup -} layers. The mixed-valent nature of this compound can be explained with two crystallographically distinct octahedral and tetrahedral sites for V{sup 4+} and V{sup 5+}, respectively. The magnetic susceptibility curve shows an antiferromagnetic coupling which can be explained with a 1-D Heisenberg model for S=1/2 with g = 1.86 and J/k = 22.5 K.
- OSTI ID:
- 160101
- Journal Information:
- Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 16 Vol. 34; ISSN 0020-1669; ISSN INOCAJ
- Country of Publication:
- United States
- Language:
- English
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