... 10 − N o / V an 1.20 with α – = anion polarizability, V an = anion molar volume, and the two least-squares parameters α − o (corresponding to free-ion polarizability) and N o . For hydroxyls, Shannon and Fischer (2016) introduced different parameter sets for non-H-bonded hydroxyls ( α − o = 1.79 Å 3...

... and with the molar A/CNK and N/NK ratios of the melts. Water and hydroxyl exchange between experimental apatite and melt was also investigated. It is determined empirically that the: ( X H 2 O melt / X Cl melt ) = [ ( − 19 . 66 ) + ( 39 . 13 ) ( X OH Ap / X Cl Ap ) ] for felsic melts at 50 to 200 MPa, having molar...

...Tamás Biró; István János Kovács; Edit Király; György Falus; Dávid Karátson; Zsolt Bendő; Tamás Fancsik; Judit K. Sándorné Abstract Hydroxyl defect concentrations of quartz phenocryst fragments from various rhyolitic pyroclastic density current deposits from the Bükk Foreland Volcanic Area, Hungary...

... submarine hydrothermal origin that had been thoroughly characterized previously were investigated with near-IR reflectance spectroscopy. The clays are mixed-layer glauconite-nontronite, talc-nontronite, talc-saponite, and nontronite samples. The hydroxyl bands in the range 2.1–2.35 μm were decomposed...

...Elizabeth C. Thompson; Andrew J. Campbell; Zhenxian Liu Abstract Oceanic plates contain numerous hydrous phases including amphiboles, which are important carriers of water into subduction zones. The hydroxyl bound within the crystalline structure of hydrous minerals, as well as changes in hydrogen...

...Wen Su; Don R. Baker; Luping Pu; Liping Bai; Xin Liu; Cedrick O’Shaughnessy Abstract Chlorine-hydroxyl diffusion was measured in pargasitic amphibole from Yunnan province, China at 1.0 GPa, 625 to 800 °C. Experiments were performed by immersing unoriented crystals in water-bearing NaCl in a piston...

...Xiaozhi Yang; Hans Keppler; Leonid Dubrovinsky; Alexander Kurnosov Abstract The infrared spectra of hydroxyl in synthetic hydrous wadsleyite (β-Mg 2 SiO 4 ) and ringwoodite (γ-Mg 2 SiO 4 ) were measured at room temperature up to ~18.8 GPa for wadsleyite and up to ~21.5 GPa for ringwoodite. High...

...Elizabeth A. Johnson; George R. Rossman Abstract To use structural hydroxyl (OH) concentrations preserved in volcanic phenocrysts to constrain magmatic water contents prior to eruption, it is first necessary to understand the diffusive behavior of hydrogen in plagioclase. In this study, diffusion...

... than predicted by the Ti contents because a substitution of Ti for Si is possible in olivine ( Hermann et al. 2005 ; Berry et al. 2007a ). The infrared absorption spectra of most olivine samples reveal stretching bands caused by structurally incorporated hydroxyl groups or “water.” Exceptions...

.... This material provides the rare opportunity to investigate the H-bond configuration of coexisting hydroxyl groups and H 2 O molecules in minerals by single-crystal neutron diffraction. * E-mail: [email protected] Manuscript handled by Hongwu Xu 13 12 2012 01 03 2013 © 2013...

... clarification, is the hydroxyl content of the carbonated apatite of bone. Recent studies reveal bone apatite to contain only ~20 mol.% of the hydroxyl content of stoichiometric hydroxylapatite, with negligible chloride or fluoride. We investigated the hypothesis that the development of vacancies in the hydroxyl...

.... Inferred Si-OH contents from ATR-IR band ratios were strongly correlated with hydroxyl contents calculated from NMR spectra. The high Si-OH content of the Hawaiian silica coating suggests it is diagenetically immature and has not been exposed to elevated temperatures. * E-mail: chemtob...

...C. H. Yoder; R. W. Schaeffer; P. McWilliams; A. Rowand; X. Liu; J. Shambeda Abstract The relative stabilities of the copper/zinc solid solutions of hydroxyl sulphates, carbonates, nitrates, chlorides and bromides were studied by attempting their preparation using a variety of methods. All...

..., zircon can incorporate hydroxyl into its structure during crystallization ( Frondel 1953 ). Experiments have also shown that in a fluorinated hydrothermal environment, (OH,F) 4 may occupy more than half the Si sites in zircon ( Caruba et al. 1985 ). Natural, non-metamict zircons from diverse provenances...

... spectrometry (TOF-SIMS), field emission scanning electron microscopy (FE-SEM), and electron probe microanalysis (EPMA) in an attempt to detect structurally bound OH − in the fluorapatite. Although OH − could not be definitively detected by Raman spectroscopy because of REE-induced photoluminescence, hydroxyl...

...C. H. Yoder; E. Bushong; X. Liu; V. Weidner; P. McWilliams; K. Martin; J. Lorgunpai; J. Haller; R. W. Schaeffer Abstract Syntheses for the three members of the copper hydroxyl nitrate family – the polymorphs rouaite and gerhardtite, and likasite – are presented along with powder diffraction data...

... ; Chen et al. 2002 ; Frost and Dolejs 2007 ). Interpretation of the properties of wadsleyite and phase boundary shifts, as a function of water content is very important to understand the OH incorporation mechanism. The incorporation of water as hydroxyl groups in the structure of NAMs such as wadsleyite...

... of coordinating irons; however, they all represent free OH stretches, isolated from hydrogen bonding. The 3660 cm −1 band can therefore be assigned to all isolated hydroxyl groups of the goethite surface. This constrains and simplifies surface band assignments to a great extent. The model is chosen...

...George E. Harlow; Frank C. Hawthorne Abstract The crystal structures of herderite, CaBePO 4 [F 0.75 (OH) 0.25 ], a = 9.7446(4), b = 7.6769(3), c = 4.7633(2) Å, β = 90.667(1)°, V = 356.31(4) Å 3 , P 2 1 / a , and Z = 4, from the Mogok Stone Tract, Myanmar, and hydroxyl-herderite, CaBePO 4 [(OH...