Frost Ray L, Weier Matt L, Martens Wayde, Mills Stuart
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, G.P.O. Box 2434, Brisbane, Qld. 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2006 Feb;63(2):282-8. doi: 10.1016/j.saa.2005.05.011. Epub 2005 Jun 20.
ThermoRaman spectroscopy has been used to study the molecular structure and thermal decomposition of kintoreite, a phosphated jarosite PbFe3(PO4)2(OH,H2O)6. Infrared spectroscopy shows the presence of significant amounts of water in the structure as well as hydroxyl units. In contrast, no water was observed for segnitite (the arsenojarosite) as determined by infrared spectroscopy. The Raman spectra at 77 K exhibit bands at 974.6, 1003.2 and 866.5 cm(-1). These bands are attributed to the symmetric stretching vibrations of (PO4)3-, (SO4)3- and (AsO4)3- units. Raman spectroscopy confirms the presence of both arsenate and phosphate in the structure. Bands at 583.7 and 558.1 cm(-1) in the 77 K spectrum are assigned to the nu4 (PO4)3- bending modes. ThermoRaman spectroscopy of kintoreite identifies the temperature range of dehydration and dehydroxylation.
热拉曼光谱已被用于研究磷钾铁石（一种磷酸盐黄钾铁矾PbFe3(PO4)2(OH,H2O)6）的分子结构和热分解。红外光谱显示该结构中存在大量的水以及羟基单元。相比之下，通过红外光谱测定，水砷钾铁石（砷黄钾铁矾）中未观察到水。77K时的拉曼光谱在974.6、1003.2和866.5 cm(-1)处出现谱带。这些谱带归因于(PO4)3-、(SO4)3-和(AsO4)3-单元的对称伸缩振动。拉曼光谱证实了该结构中同时存在砷酸盐和磷酸盐。77K光谱中583.7和558.1 cm(-1)处的谱带归属于ν4 (PO4)3-弯曲模式。磷钾铁石的热拉曼光谱确定了脱水和脱羟基的温度范围。
