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000154603 1001_ $$0P:(DE-Juel1)157790$$aHeidelmann, Markus$$b0$$eCorresponding Author$$ufzj
000154603 245__ $$aPeriodic Cation Segregation in Cs$_{0.44}$[Nb$_{2.54}$W$_{2.46}$O$_{14}$] Quantified by High-Resolution Scanning Transmission Electron Microscopy
000154603 260__ $$aNew York, NY$$bCambridge University Press$$c2014
000154603 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article$$bjournal$$mjournal$$s1414490075_26056
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000154603 520__ $$aThe atomic structure of Cs0.44[Nb2.54W2.46O14] closely resembles the structure of the most active catalyst for the synthesis of acrylic acid, the M1 phase of . Consistently with observations made for the latter compound, the high-angle electron scattering signal recorded by scanning transmission electron microscopy shows a significant intensity variation, which repeats periodically with the projected crystallographic unit cell. The occupation factors for the individual mixed Nb/W atomic columns are extracted from the observed intensity variations. For this purpose, experimental images and simulated images are compared on an identical intensity scale, which enables a quantification of the cation distribution. According to our analysis specific sites possess low tungsten concentrations of 25%, whereas other sites have tungsten concentrations above 70%. These findings allow us to refine the existing structure model of the target compound, which has until now described a uniform distribution of the niobium and tungsten atoms in the unit cell, showing that the similarity between Cs0.44[Nb2.54W2.46O14] and the related catalytic compounds also extends to the level of the cation segregation.
000154603 536__ $$0G:(DE-HGF)POF2-424$$a424 - Exploratory materials and phenomena (POF2-424)$$cPOF2-424$$fPOF II$$x0
000154603 7001_ $$0P:(DE-Juel1)130525$$aBarthel, Juri$$b1$$ufzj
000154603 7001_ $$0P:(DE-HGF)0$$aCox, Gerhard$$b2
000154603 7001_ $$0P:(DE-Juel1)131029$$aWeirich, Thomas$$b3$$ufzj
000154603 773__ $$0PERI:(DE-600)1481716-0$$a10.1017/S1431927614001330$$n5$$p1453-1462$$tMicroscopy and microanalysis$$v20$$x1431-9276$$y2014
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