TY  - JOUR
AU  - Otsuka, Yusuke
AU  - Pithan, Christian
AU  - Dornseiffer, Jürgen
AU  - Takada, Takahiro
AU  - Konoike, Takehiro
AU  - Waser, R.
TI  - Synthesis of nitrogen and lanthanum codoped barium titanate with a novel thermal ammonolysis reactor
JO  - Journal of the European Ceramic Society
VL  - 36
IS  - 11
SN  - 0955-2219
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2016-02696
SP  - 2719 - 2725
PY  - 2016
AB  - Lanthanum doped barium titanate was nitridated by thermal ammonolysis with a newly designed reactor, which performs extended efficiency to supply ammonia with less decomposition at elevated temperatures above 600 °C. The kinetics of nitrogen-uptake was studied systematically at elevated temperatures. Nitrogen-content, thermal stability and crystallographic phase of nitridated lanthanum doped barium titanate were characterized by several techniques. The final nitrogen-content of nitridated lanthanum doped barium titanate was much higher than the content of lanthanum, resulting in the formation of oxygen vacancies compensating the additional negative electrical charge of nitrogen anions occupying regular oxygen sites in the lattice. Through thermal ammonolysis, strongly reducing conditions because of the decomposition of ammonia generating hydrogen gas causes the formation of barium orthotitanate as a secondary phase. Ammonolysis temperature below 800 °C and suppression of thermal decomposition of ammonia gas are essential to realize a nitridated lanthanum doped barium titanate as a single phase.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000376808100009
DO  - DOI:10.1016/j.jeurceramsoc.2016.03.033
UR  - https://juser.fz-juelich.de/record/809769
ER  -