Browsing by Author "Reeder R.J."
- DSpace Home
- →
- Browsing by Author
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing by Author "Reeder R.J."
Now showing items 1-18 of 18
-
Withers S.H.; Peale R.E.; Schulte A.F.; Braunstein G.; Beck K.M.; Hess W.P.; Reeder R.J. (2003)Calcite micro-crystals were grown from solution with single crystal dimensions up to 3 mm and doped up to ~0.1% with Nd3+ ions. Phase purity was verified by powder x-ray diffraction. The concentration of Nd3+ was measured ...
-
Gasparik T.; Parise J.B.; Reeder R.J.; Young V.G.; Wilford W.S. (1999)A new phase isostructural with the minerals of the aenigmatite group Na2Mg41xFe Si61xO20 with x 5 0.25 2 0.5 was synthesized at 13-14 GPa with a split- 31 222x sphere anvil apparatus (USSA-2000). The structure (for x 5 ...
-
Reeder R.J.; Nugent M.; Tait C.Drew; Morris D.E.; Heald S.M.; Beck K.M.; Hess W.P.; Lanzirotti A. (2001)X-ray absorption and luminescence spectroscopies have been used to characterize the local structure and coordination of uranium(VI) species coprecipitated with calcite (CaCO3) from room-temperature aqueous solutions. ...
-
Elzinga E.J.; Reeder R.J.; Withers S.H.; Peale R.E.; Mason R.A.; Beck K.M.; Hess W.P. (2002)Extended X-ray absorption fine-structure (EXAFS) spectroscopy is used to characterize the local coordination of selected rare-earth elements (Nd3+, Sm3+, Dy3+, Yb3+) coprecipitated with calcite in minor concentrations from ...
-
Hemming N.G.; Reeder R.J.; Hart S.R. (1998)Ion microprobe analyses of as-grown{1014} faces of B-doped calcite single crystals show that boron oxyanions are incorporated differentially between nonequivalent vicinal faces that compose spiral growth hillocks. The ...
-
Reeder R.J. (1996)Coprecipitation experiments from aqueous solution at room temperature reveal that divalent Co, Zn, Cd, and Ba exhibit different preferences for incorporation among multiple surface sites present on the calcite {1014} face ...
-
Rakovan J.; Reeder R.J. (1996)Intracrystalline REE distributions in fluorapatite have been studied using cathodoluminescence and synchrotron X-ray fluorescence microanalysis (SXRFMA). In the apatite samples studied the {1010} face grows by the spiral ...
-
Reeder R.J.; Valley J.W.; Graham C.M.; Eiler J.M. (1997)A synthetic calcite crystal that exhibits surface-structure-controlled, differential incorporation of a trace element was examined by ion microprobe to determine whether the controls causing differential element incorporation ...
-
Reeder R.J.; Hanson G.N.; Hemming N.G. (1995)Aragonite, high-Mg calcite, and Mg-free calcite have been grown under monitored laboratory conditions to investigate mineral-fluid partitioning and isotopic fractionation of boron into carbonates. At pH # 8, both polymorphs ...
-
RELATIONSHIP BETWEEN SURFACE STRUCTURE, GROWTH MECHANISM, AND TRACE ELEMENT INCORPORATION IN CALCITE Paquette J.; Reeder R.J. (1995)Crystal growth and coprecipitation experiments demonstrate the manner in which surface structure and, in turn, crystal structure influence growth mechanism and trace element incorporation in calcite. Dominant {1014} faces ...
-
Sanyal A.; Nugent M.; Reeder R.J.; Bijma J. (2000)Experiments involving boron co-precipitation with calcite have been carried out inorganically under controlled pH conditions (7.9 +/- 0.05, 8.3 +/- 0.05 and 8.6 +/- 0.05) to determine the dependence of the boron isotopic ...
-
Reeder R.J.; Elzinga E.J.; Tait C.D.; Rector K.D.; Donohoe R.J.; Morris D.E. (2004)Spatially resolved luminescence spectra from U(VI) co-precipitated at the (101̄4) growth surface of synthetic calcite single crystals confirm heterogeneous incorporation corresponding to the distribution of structurally ...
-
Elzinga E.J.; Tait C.D.; Reeder R.J.; Rector K.D.; Donohoe R.J.; Morris D.E. (2004)The interaction of U(VI) species with the calcite surface in pre-equilibrated calcite suspensions at pH 7.4 and 8.3 and P(CO2 ) = 10-3.5 bar was characterized in situ using extended X-ray absorption spectroscopy (EXAFS) ...
-
Lee Y.J.; Reeder R.J.; Wenskus R.W.; Elzinga E.J. (2002)Mn K-edge EXAFS spectroscopy of solid-solution samples encompassing the complete MnCO3-CaCO3 series shows that first-shell Mn-O distances deviate little from the 2.19-A distance observed in pure MnCO3. Very slight lengthening ...
-
Rouff A.A.; Elzinga E.J.; Reeder R.J.; Fisher N.S. (2005)Pb(II) sorption experiments with calcite powders were conducted in suspensions equilibrated at atmospheric PCO2(g) and ambient temperature at pH 7.3, 8.2 and 9.4. Pb fractional sorption was low at pH 7.3 and 9.4 relative ...
-
Elzinga E.J.; Rouff A.A.; Reeder R.J. (2006)In this study, the speciation of Zn2+, Pb2+, and Cu2+ ions sorbed at the calcite surface was monitored during a 2.5-year reaction period, using extended X-ray absorption spectroscopy to characterize metal speciation on the ...
-
Lee Y.J.; Reeder R.J. (2006)The influence of citrate and phthalate on Co coprecipitation with calcite was investigated using a combination of batch experiments, Fourier-transform infra-red (FT-IR) spectroscopy, and thermogravimetric analysis (TGA) ...
-
Elzinga E.J.; Reeder R.J. (2002)We report results from in situ extended X-ray absorption fine structure (EXAFS) spectroscopy studies of Cu(II) and Zn(II) complexes forming at the calcite surface following adsorption from preequilibrated calcite-saturated ...
Now showing items 1-18 of 18