Flux Synthesis of Salt-Inclusion Uranyl Silicates: [K3Cs4F][(UO2)3(Si2O7)2] and [NaRb6F][(UO2)3(Si2O7)2]

2009 ◽  
Vol 48 (17) ◽  
pp. 8357-8361 ◽  
Author(s):  
Cheng-Shiuan Lee ◽  
Sue-Lein Wang ◽  
Yen-Hung Chen ◽  
Kwang-Hwa Lii
Keyword(s):  
Flux Synthesis ◽  
Uranyl Silicates

ChemInform Abstract: Flux Synthesis of Salt-Inclusion Uranyl Silicates: [K3Cs4F] [(UO2)3(Si2O7)2] (I) and [NaRb6F] [(UO2)3(Si2O7)2] (II).

ChemInform ◽  
2009 ◽  
Vol 40 (47) ◽  
Author(s):  
Cheng-Shiuan Lee ◽  
Sue-Lein Wang ◽  
Yen-Hung Chen ◽  
Kwang-Hwa Lii
Keyword(s):  
Flux Synthesis ◽  
Uranyl Silicates

Enhanced thermoelectric performance of Cs doped BiCuSeO prepared through eco-friendly flux synthesis

2018 ◽  
Vol 735 ◽  
pp. 861-869 ◽  
Author(s):  
Abdenour Achour ◽  
Kan Chen ◽  
Michael J. Reece ◽  
Zhaorong Huang
Keyword(s):  
Thermoelectric Performance ◽  
Flux Synthesis

ChemInform Abstract: An Extension of Pnictide Oxide Chemistry - Salt Flux Synthesis and Structure of La5Cu4As4O4Cl2.

ChemInform ◽  
2010 ◽  
Vol 41 (11) ◽  
pp. no-no
Author(s):  
Matthias Eul ◽  
Dirk Johrendt ◽  
Rainer Poettgen
Keyword(s):  
Salt Flux ◽  
Flux Synthesis

Self-flux synthesis and photoluminescent properties of LiAl5O8

2009 ◽  
Vol 44 (1) ◽  
pp. 70-73 ◽  
Author(s):  
Shinobu Hashimoto ◽  
Kentaro Hattori ◽  
Koji Inoue ◽  
Ayuka Nakahashi ◽  
Sawao Honda ◽  
...  
Keyword(s):  
Flux Synthesis

scholarly journals An ecosystem-scale perspective of the net land methanol flux: synthesis of micrometeorological flux measurements

2015 ◽  
Vol 15 (13) ◽  
pp. 7413-7427 ◽  
Author(s):  
G. Wohlfahrt ◽  
C. Amelynck ◽  
C. Ammann ◽  
A. Arneth ◽  
I. Bamberger ◽  
...  
Keyword(s):  
Atmospheric Chemistry ◽  
Dominant Role ◽  
Terrestrial Ecosystem ◽  
Surface Wetness ◽  
Flux Synthesis ◽  
Leaf Level ◽  
Flux Measurements ◽  
The Rich ◽  
Study Sites ◽  
Source Sink

Abstract. Methanol is the second most abundant volatile organic compound in the troposphere and plays a significant role in atmospheric chemistry. While there is consensus about the dominant role of living plants as the major source and the reaction with OH as the major sink of methanol, global methanol budgets diverge considerably in terms of source/sink estimates, reflecting uncertainties in the approaches used to model and the empirical data used to separately constrain these terms. Here we compiled micrometeorological methanol flux data from eight different study sites and reviewed the corresponding literature in order to provide a first cross-site synthesis of the terrestrial ecosystem-scale methanol exchange and present an independent data-driven view of the land–atmosphere methanol exchange. Our study shows that the controls of plant growth on production, and thus the methanol emission magnitude, as well as stomatal conductance on the hourly methanol emission variability, established at the leaf level, hold across sites at the ecosystem level. Unequivocal evidence for bi-directional methanol exchange at the ecosystem scale is presented. Deposition, which at some sites even exceeds methanol emissions, represents an emerging feature of ecosystem-scale measurements and is likely related to environmental factors favouring the formation of surface wetness. Methanol may adsorb to or dissolve in this surface water and eventually be chemically or biologically removed from it. Management activities in agriculture and forestry are shown to increase local methanol emission by orders of magnitude; however, they are neglected at present in global budgets. While contemporary net land methanol budgets are overall consistent with the grand mean of the micrometeorological methanol flux measurements, we caution that the present approach of simulating methanol emission and deposition separately is prone to opposing systematic errors and does not allow for full advantage to be taken of the rich information content of micrometeorological flux measurements.

scholarly journals Thortveitite-type Tm2Si2O7

2014 ◽  
Vol 70 (7) ◽  
pp. i34-i35 ◽  
Author(s):  
Volker Kahlenberg ◽  
Paul Aichholzer
Keyword(s):  
Ambient Pressure ◽  
Point Group ◽  
Structure Type ◽  
Group Symmetry ◽  
Site Symmetry ◽  
Cation Site ◽  
Bond Lengths ◽  
Flux Synthesis ◽  
Distorted Octahedral ◽  
The Individual

Single crystals of dithulium disilicate, Tm2Si2O7, were obtained in flux synthesis experiments in the system SiO2–Tm2O3–LiF at ambient pressure. The compound belongs to the group of sorosilicates,i.e.it is based on [Si2O7]-units and crystallizes in the thortveitite (Sc2Si2O7) structure type. The Tm3+cation (site symmetry .2.) occupies a distorted octahedral site, with Tm—O bond lengths in the range 2.217 (4)–2.289 (4) Å. Each of the octahedra shares three of its edges with adjacent [TmO6] groups, resulting in the formation of layers parallel to (001). The individual [SiO4] tetrahedra are more regular,i.e.the differences between the bond lengths between Si and the bridging and non-bridging O atoms are not very pronounced. The layers containing the octahedra and the sheets containing the [Si2O7] groups (point group symmetry 2/m) form an alternating sequence. Linkage is provided by sharing common oxygen vertices.

Alteration of Natural Uranyl Oxide Hydrates in Si-Rich Groundwaters: Implications For Uranium Solubility

1991 ◽  
Vol 257 ◽  
Author(s):  
R.J. Finch ◽  
R.C. Ewing
Keyword(s):  
Corrosion Products ◽  
Dissolved Silica ◽  
Uranyl Phosphates ◽  
Uranyl Silicates ◽  
Solid Phases ◽  
And Control

ABSTRACTThe uranyl oxide hydrates are common initial corrosion products of uraninite (nominally U02+x) during weathering. In the presence of dissolved silica these early-formed phases alter to uranyl silicates (most commonly soddyite, U2SiO8-2H2O, and uranophane, CaU2Si2O11·6H2O). Uraninite, however, usually contains radiogenic Pb, and the earlyformed Pb-poor uranyl oxide hydrates alter incongruously to uranyl silicates plus Pb-enriched uranyl oxide hydrates such as curite. Similar to dissolved silica, radiogenic Pb may also serve to limit the mobility of U in nature by fixing U in solid phases. Curite may also play an important role in the formation of uranyl phosphates, which are significantly less soluble than the uranyl silicates, and control U solubility in many groundwaters associated with altered U ore.

New Layered Compounds through Polysulfide Flux Synthesis;A2Sn4S9(A=K, Rb, Cs) Present a New Form of the [Sn4S9]2−Network

1998 ◽  
Vol 141 (1) ◽  
pp. 17-28 ◽  
Author(s):  
Gregory A. Marking ◽  
M. Evain ◽  
V. Petricek ◽  
Mercouri G. Kanatzidis
Keyword(s):  
Layered Compounds ◽  
Flux Synthesis ◽  
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