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Synthesis and characterization of a disordered variant of KB₅O₇(OH)₂

Author:
Ortner, Teresa S., Schauperl, Michael, Wurst, Klaus, Hofer, Thomas S., Huppertz, Hubert
Source:
Zeitschrift für Naturforschung 2015 v.70 no.9 pp. 649-658
ISSN:
1865-7117
Subject:
cations, crystal structure, potassium, potassium nitrate
Abstract:
The potassium pentaborate KB₅O₇(OH)₂ reported herein crystallizes in the monoclinic space group P2₁/c (no. 14) with the lattice parameters a = 904.8(2), b = 753.2(2), c = 1214.9(5) pm, β = 117.16(2)°, and V = 0.73663(5) nm³ (Z = 4). It is a disordered structural variant of an already known compound with the same composition (a = 766.90(3), b = 904.45(3), c = 1223.04(4) pm, β = 119.132(2)°, and V = 0.74101(5) nm³ (Z = 4)) reported by Wu in 2011. The disorder of the potassium cation in the single crystal structure determination of KB₅O₇(OH)₂ presented here leads to a remarkably elongated a axis and a corresponding reduction of the length of the b axis in comparison to the ordered compound. The disordered variant was obtained through a hydrothermal synthesis from KNO₃, B₂O₃, and Ce(NO₃)₃·6H₂O with a molar ratio of 1:1:0.07.
Agid:
5225014