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Nastanek LaCrO[spodaj]3 med zgorevalno sintezo
Zupan, Klementina (Author), Marinšek, Marjan (Author), Pejovnik, Stane (Author), Hrobat, Teja (Author)

URLURL - Presentation file, Visit http://www.dlib.si/details/URN:NBN:SI:DOC-4VVU9508 This link opens in a new window

Abstract
Med vrsto postopkov mokre kemije, s katerimi poskušajo zagotoviti v produktu večjo homogenost na atomskem nivoju, večjo čistost ter večjo aktivnost prahov, je zgorevalna sinteza iz raztopin tista metoda, ki v zadnjem času hitro pridobiva na pomenu. Pri zgorevalni sintezi lantanovega kromita lahko izhajamo iz kovinskih nitratov, izbiramo pa lahko med različnimi reducenti (tetraformaltrisazin-TFTA, urea, glicin citronska kislina). V prispevku primerjamo nastanek lantanovega kromita med kalcinacijskim postopkom in v procesu zgorevalne sinteze iz citratno-nitratnega gela. Pri obeh postopkih smo pogoje za pripravo intermediatov izbrali na osnovi razultatov termične analize reakcijskih zmesi. Sestavo faz ter morfologijo vmesnih in končnih produktov smo določali z rentgensko praškovno in SEM-analizo.

Language:Slovenian
Keywords:zgorevalna sinteza, lantanov kromit, nastanek
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:FKKT - Faculty of Chemistry and Chemical Technology
Year:2006
Publisher:Inštitut za kovinske materiale in tehnologije
Number of pages:str. 253-256
Numbering:Letn. 40, št. 6
UDC:546.654:54.057
ISSN on article:1580-2949
COBISS.SI-ID:579754 Link is opened in a new window
Views:673
Downloads:144
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Record is a part of a journal

Title:Materiali in tehnologije
Shortened title:Mater. tehnol.
Publisher:Inštitut za kovinske materiale in tehnologije
ISSN:1580-2949
COBISS.SI-ID:106193664 This link opens in a new window

Secondary language

Language:English
Title:LaCrO[sub]3 formation during combustion synthesis
Abstract:
Several methods for the low-temperature synthesis of LaCrO3 have been developed to achieve the compositional homogeneity, purity and activity of powders including combustion synthesis from the solutions. The reaction mixtures usually employ metal nitrates and different reducing agents, e.g., TFTA (teraformal trisazine), urea, glycine, and citric acid. In the present work the formation of LaCrO3 in the calcining and in the combustion process was compared. In both procedures, intermediate formation temperatures were determined by thermal analysis. The intermediates and the final products were characterized by X-ray powder diffraction and by scanning electron microscopy.

Keywords:combustion synthesis, lanthanum chromite, formation

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