Naslov
Calcium manganite coatings from chemically synthesized powders

Autori
Macan, Jelena ; Havliček, Anamarija ; Kralj, Suzana ; Panžić, Ivana ; Čeh, Miran ; Gajović, Andreja

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, prošireni sažetak, znanstveni

Izvornik
Proceedings from the 14th multinational congress on microscopy / Grbović Novaković, Jasmina ; Nestorović, Nataša ; Rajnović, Dragan - Beograd : Institute for Biological Research “Siniša Stanković”, 2019, 472-474

ISBN
978-86-80335-11-7

Skup
14th Multinational Congress on Microscopy (MCM 2019)

Mjesto i datum
Beograd, Srbija, 15.09.2019. - 20.09.2019

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
calcium manganite ; autocombustion synthesis ; coprecipitation ; morphology ; coatings

Sažetak
Calcium manganite, CaMnO3, is a perovskite which has potential uses in sensing light and various gaseous or volatile compounds, while heterostructures comprising calcium manganite seem to exhibit enhanced photovoltaic and catalytic activities. The manganites are both electron and oxygen conductive as well as temperature-resistant and oxidatively stable. Therefore we are investigating appropriate methods to synthesise CaMnO3 powders and prepare thin coatings suitable for these applications. Calcium manganite powders were synthesised from water solutions of calcium and manganese nitrates by three different methods. To study the crystallization process, raw powders were calcined at 400, 600, 700 and 900 °C for two hours. Full conversion to crystalline CaMnO3 occurs at 900 °C for all cases, but the powders obtained from both Pechini’s and citrate method also contain some marokite, CaMn2O4, while coprecipitation yields XRD-pure CaMnO3. Pechini’s and citrate methods also have much poorer yield, resulting in only 25 % of theoretically obtainable quantity of CaMnO3, while coprecipitation has 75 % yield. Coatings on glass substrates were successfully applied using a doctor blade. The ashy powders obtained by Pechini’s and citrate methods have very porous, sponge-like morphology and are formed from fused smaller crystalline grains, some of which are ~200 nm in diameter. This morphology is due to intensive gas evolvement during the self-combustion step of the synthesis. Coprecipitation, on the other hand, yields large and porous spherical aggregates of similarly-sized crystalline grains.

Izvorni jezik
Engleski

Znanstvena područja
Kemijsko inženjerstvo, Temeljne tehničke znanosti

POVEZANOST RADA