title: A Raman spectroscopic study of the mono-hydrogen phosphate mineral dorfmanite Na2(PO3OH)·2H2O and in comparison with brushite.
abstract: Aspects of the molecular structure of the mineral dorfmanite Na(2)(PO(3)OH)·2H(2)O were determined by Raman spectroscopy. The mineral originated from the Kedykverpakhk Mt., Lovozero, Kola Peninsula, Russia. Raman bands are assigned to the hydrogen phosphate units. The intense Raman band at 949 cm(-1) and the less intense band at 866 cm(-1) are assigned to the PO(3) and POH stretching vibrations. Bands at 991, 1066 and 1141 cm(-1) are assigned to the ν(3) antisymmetric stretching modes. Raman bands at 393, 413 and 448 cm(-1) and 514, 541 and 570 cm(-1) are attributed to the ν(2) and ν(4) bending modes of the HPO(4) units, respectively. Raman bands at 3373, 3443 and 3492 cm(-1) are assigned to water stretching vibrations. POH stretching vibrations are identified by bands at 2904, 3080 and 3134 cm(-1). Raman spectroscopy has proven very useful for the study of the structure of the mineral dorfmanite.
authors.affiliation: Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. r.frost@qut.edu.au
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Sara J
authors.initials: SJ
authors.lastname: Palmer
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Xi
mesh_terms: D002130:Calcium Phosphates / Q000737:chemistry*; D002621:Chemistry / Q000379:methods*; D006859:Hydrogen / Q000737:chemistry*; D006860:Hydrogen Bonding; D008903:Minerals / Q000737:chemistry*; D008956:Models, Chemical; D010710:Phosphates / Q000737:chemistry*; D012426:Russia; D012964:Sodium / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014732:Vibration; D014867:Water / Q000737:chemistry
chemical_list: D002130:Calcium Phosphates; D008903:Minerals; D010710:Phosphates; D014867:Water; D006859:Hydrogen; D012964:Sodium; C494366:calcium phosphate, dibasic, dihydrate