Citrate-nitrate auto-combustion synthesis of perovskite-type nanopowders: A systematic approach

被引：223

作者：

Deganello, F. ^{[1
]}

Marci, G. ^{[2
]}

Deganello, G. ^{[1
,3
]}

机构：

[1] CNR, Ist Studio Mat Nanostrutturati, I-90146 Palermo, Italy

[2] Univ Palermo, Dipartimento Ingn Chim Proc & Mat, I-90128 Palermo, Italy

[3] Univ Palermo, Dipartimento Chim Inorgan & Analit S Cannizzaro, I-90128 Palermo, Italy

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2009年 / 29卷 / 03期

关键词：

Citrate-nitrate auto-combustion synthesis; Powders-chemical preparation; Microstructure-final; Perovskites; Fuel cells; DOPED BARIUM CERATE; CITRIC-ACID; GEL COMBUSTION; NANOCRYSTALLINE POWDERS; MAGNETIC-PROPERTIES; LOCAL ENVIRONMENT; OXIDE; CERIA; PH; YTTRIUM;

D O I：

10.1016/j.jeurceramsoc.2008.06.012

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Citrate-nitrate auto-combustion synthesis is used to prepare an iron, a cobalt and a cerium-perovskite. The influence of different synthesis conditions on the combustion process, phase composition, textural and morphological properties is studied in detail by X-ray diffraction, nitrogen adsorption and scanning electron microscopy. Results show that the combustion intensity increases from iron, to cerium, to cobalt-perovskite. Conversely, the combustion intensity decreases and thus the safety and the gain of the combustion process increase by using high fuel/oxidant ratios, low pH values or combustion reactors with high heat dispersion capacity. High fuel/oxidant ratios increase particle size and may enhance dopant segregation. Low citric acid/metal nitrates ratios may cause precipitation of the most insoluble compounds or segregation of the dopant. High citric acid/metal nitrates ratios increase the formation temperature of the perovskite-type structure. Low pH values are deleterious for the phase composition and/or for the morphology of the final product, although at high pH values dopant segregation may occur. (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：439 / 450

页数：12

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