Journal Article

FZJ-2019-04638

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Processing-induced secondary phase formation in Mo-substituted lanthanum tungstate membranes

Ran, K. (Corresponding author)FZJ* ; Deibert, W.FZJ* ; Du, H.FZJ* ; Park, D.FZJ* ; Ivanova, M. E.FZJ* ; Meulenberg, W. A.FZJ* ; Mayer, J.FZJ*

2019
Elsevier Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.actamat.2019.08.053

Abstract: The compositional homogeneity of a technically relevant hydrogen separation membrane, La5.4W0.8Mo0.2O12-δ (LWO-Mo20), was studied using comprehensive transmission electron microscopy (TEM) techniques. The membrane is predominantly composed of dense LWO-Mo20 grains with a defect fluorite structure. In addition to the primary phase, the observed secondary phase (SP) grains were identified as La2/3(Mg1/2W1/2)O3, with the W sites partially occupied by Mo, Fe and Al. Part of the SP grains were incorporated into single LWO-Mo20 grains through smart orientations, in which massive structural defects at the interface of the LWO-Mo20 and SP grains are efficiently avoided. Slight elemental disorder is limited within a few atomic layers. In contrast, the LWO-Mo20 grains share barely common features with neighboring SP grains, and are unstable under electron beam irradiation. The formation of the SP was tracked back to the traces of impurities in the precursors. Excluding such impurities is technically challenging and unacceptable in terms of cost. Hence, our results here show an opportunity to remedy these impurities through engineering the SP into individual primary grains, in which even a significant cost reduction could thus be realized.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)
2. Materialwissenschaft u. Werkstofftechnik (ER-C-2)

Research Program(s):

1. 113 - Methods and Concepts for Material Development (POF3-113) (POF3-113)
2. DFG project 167917811 - SFB 917: Resistiv schaltende Chalkogenide für zukünftige Elektronikanwendungen: Struktur, Kinetik und Bauelementskalierung "Nanoswitches" (167917811) (167917811)

Appears in the scientific report 2019

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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