Abstract
A new type of PbHNSO3 crystal has been grown by a gel method using agar-agar gel. TG-DTA and X-ray diffraction measurements have been performed on single crystal samples of PbHNSO3. It is found that the thermal decomposition of the compound starts at about 960 K. The space group (orthorhombic Pnma) and structural parameters are determined at room temperature with unit cell dimensions: a=8.4690(6), b=5.3934(4) and c=6.9530(4) Å. The crystal structure is found to consist of NSO3 pseudo-tetrahedra, PbO9N3 polyhedra, and NSO3-Pb-NSO3 frameworks. The dark brown color of the crystal is suggested to be caused by the absorption of blue wavelengths of light which is due to the excitation of excess electrons in potential wells produced by the NSO3-Pb-NSO3 framework.
Highlights
It is well known that crystals of an ANH2SO3-type consist of a monovalent cation (A+=Li+, Na+, K+, Rb+, Cs+, Ag+, NH4+, C(NH2)3+ or (CH3)3NCH2COOH+) and a sulfamate [NH2SO3]- anion
thermogravimetric-differential thermal analysis (TG-DTA) and X-ray diffraction measurements have been performed on single crystal samples of PbHNSO3
The dark brown color of the crystal is suggested to be caused by the absorption of blue wavelengths of light which is due to the excitation of excess electrons in potential wells produced by the NSO3-Pb-NSO3 framework
Summary
It is well known that crystals of an ANH2SO3-type consist of a monovalent cation (A+=Li+, Na+, K+, Rb+, Cs+, Ag+, NH4+, C(NH2)3+ or (CH3)3NCH2COOH+) and a sulfamate [NH2SO3]- anion It has been reported that the KNH2SO3 crystal undergoes another phase transition at 350 K and becomes an ionic conductor at high temperature, and the CsNH2SO3 crystal has a structural phase transition from monoclinic P21/c to orthorhombic Pnma at 330 K (Varughese et al, 2010; Kumar et al, 2011; Fukami et al, 2011). The NH4NH2SO3 and C(NH2)3NH2SO3 compounds of the ANH2SO3-type have good abilities as fire retardant (Benson & Spillane, 1980)
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