Journal Article

FZJ-2014-06529

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Microstructure of sodium-potassium niobate ceramics sintered under high alkaline vapor pressure atmosphere

Acker, J. ; Kungl, H. (Corresponding Author)FZJ* ; Schierholz, R.FZJ* ; Wagner, S. ; Eichel, R.-A.FZJ* ; Hoffmann, M. J.

2014
Elsevier Science Amsterdam [u.a.]

This record in other databases:    

Please use a persistent id in citations: doi:10.1016/j.jeurceramsoc.2014.06.021

Abstract: One of the most challenging steps in processing sodium potassium niobate (KNN) ceramics is sintering. At temperatures close to the solidus line, the high volatility of the alkaline becomes an issue of major concern for the sintering process. While alkaline evaporation is frequently related to difficulties in densification, few work on the effects of alkaline vapor pressure on microstructure have been reported. KNN materials with alkaline/niobium ratios ranging from 1.02 to 0.98 were sintered at 1105 °C. Two different sintering setups were used. An alkaline rich sintering atmosphere was provided when sintering the materials embedded in (K0.5Na0.5)1.02NbO3 powder, while reference ceramics were sintered in loosely covered crucibles. Resulting from the alkaline content in the sintering atmosphere a shift toward microstructures considered typical for batch compositions with higher alkaline content was detected. Densities decrease for KNN with alkaline excess and stoichiometric KNN, whereas they tend to increase for niobium excess material.

---

Contributing Institute(s):

1. Grundlagen der Elektrochemie (IEK-9)

Research Program(s):

1. 123 - Fuel Cells (POF2-123) (POF2-123)
2. 152 - Renewable Energies (POF2-152) (POF2-152)

Appears in the scientific report 2014

---

Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

---