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):  
2019 ◽  
Vol 6 (11) ◽  
pp. 115519
Author(s):  
Daniel Harris ◽  
Sridhar Budhi ◽  
Yuqi She ◽  
Jonah Henry ◽  
Brian M Leonard

2015 ◽  
Vol 54 (8) ◽  
pp. 3889-3895 ◽  
Author(s):  
Samantha M. Schmuecker ◽  
Brian M. Leonard

2005 ◽  
Vol 178 (9) ◽  
pp. 2922-2926 ◽  
Author(s):  
Jonathan D. Woodward ◽  
Thomas E. Albrecht-Schmitt

2009 ◽  
Vol 64 (11-12) ◽  
pp. 1353-1359 ◽  
Author(s):  
Matthias Eul ◽  
Dirk Johrendt ◽  
Rainer Pöttgena

La5Cu4As4O4Cl2 was prepared from a cold-pressed pellet of lanthanum filings, ground arsenic, Cu2O and LaOCl in the ideal 3 : 4 : 2 : 2 ratio. The pellet was annealed in an evacuated silica tube at 1473 K for two days and then cooled down to room temperature. LaOCl was always observed as a by-product. La5Cu4As4O4Cl2 crystallizes with a new structure type: I4/mmm, a = 413.46(7), c = 4144(1) pm, wR2 = 0.0763, 328 F2 values, 26 parameters. The new quaternary arsenide oxide La3Cu4As4O2 with La3Cu4P4O2-type structure (I4/mmm) was obtained in polycrystalline form: a = 413.0(1), c = 2748.6(1) pm. The structure of La5Cu4As4O4Cl2 is an intergrowth of structural slabs of LaOCl (PbFCl type), ZrCuSiAs- and La3Cu4P4O2-related slabs. The copper atoms have tetrahedral arsenic coordination, and all oxygen atoms fill lanthanum tetrahedra. In the LaOCl slab we observe a van der Waals gap built up by the chloride anions. Half of the arsenic atoms within the La3Cu4P4O2-related slab form As24− dumb-bells at an As-As distance of 249 pm. Electronic band structure calculations reveal La5Cu4As4O4Cl2 as a strongly anisotropic hybride material, composed of covalently bonded metallic CuAs4/4 layers, sandwiched between ionic insulating oxide and chloride blocks


2016 ◽  
Vol 3 (7) ◽  
pp. 074002 ◽  
Author(s):  
Brian M Leonard ◽  
Gregory R Waetzig ◽  
Dale A Clouser ◽  
Samantha M Schmuecker ◽  
Daniel P Harris ◽  
...  
Keyword(s):  

2020 ◽  
Author(s):  
Rachelle Austin ◽  
Feier Hou

In this study, ZnO-SnO2 composites were synthesized using flux synthesis, a synthetic approach different from previous studies, in which molten ZnCl2 acted both as a reactant and as the flux for the reaction. Their photocatalytic properties were measured for the degradation of the organic dye, methylene blue. It was found that as the temperatures of the synthesis increase, the specific surface areas of the ZnO-SnO2 composites decrease, which would decrease their photocatalytic activities due to decreased adsorption of the dye on the surface of the composites; while their crystallinity increases, which would increase their photocatalytic activities due to the smaller concentration of defects and thus improved mobility of the charge carriers. An interplay of those two factors affects their photocatalytic activities, with the composite with the highest photocatalytic activity degrading approximately 95% of the methylene blue dye within 10 minutes. By changing the temperature of the flux synthesis alone, the crystallinity and surface area of the ZnO-SnO2 composite can be changed, which provides a possible way to obtain ZnO-SnO2 composites with relatively high crystallinity and surface area to maximize their photocatalytic activity.


2017 ◽  
Vol 56 (5) ◽  
pp. 055503 ◽  
Author(s):  
Motoki Iwase ◽  
Mamiko Nakabayashi ◽  
Naoya Shibata ◽  
Chihiro Izawa ◽  
Masao Katayama ◽  
...  

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