Synthesis of lanthanide manganites LnMnO3 and LnMn2O5 from individual molecular precursors

Autor: Zh. V. Dobrokhotova, M. L. Kovba, Vladimir M. Novotortsev, Andrey V. Gavrikov, Mikhail A. Kiskin, Pavel S. Koroteev, A. V. Tyurin, N. N. Efimov, D. I. Kirdyankin
Rok vydání: 2015
Předmět:
Zdroj: Russian Journal of Inorganic Chemistry. 60:1433-1443
ISSN: 1531-8613
0036-0236
DOI: 10.1134/s0036023615120098
Popis: Methods for the synthesis of lanthanide manganites LnMnO3 and LnMn2O5 from individual molecular precursors were developed. The thermolysis of the neodymium complex from the series of [Mn3Ln2(Piv)10(NO3)2(MeCN)2] n compounds (Ln = Nd (1), Sm (2), Eu (3), Gd(4)) was shown to yield a NdMnO3–NdMn2O5 (1: 1) mixture. NdMnO3–NdMn2O5 films on Y2O3-doped ZrO2 were obtained from solutions of the neodymium complex using the temperature program providing a constant gas liberation rate. The thermolysis of several series of lanthanide carboxylates containing the cymantrene moiety (Cym = (η5-C5H4)Mn(CO)3) was studied. The thermolysis of these compounds was shown to quantitatively yield LnMn2O5–Mn2O3 mixtures or LnMn2O5 and LnMnO3 phases, and the composition of the product was governed by the Ln: Mn atomic ratio in the initial complex. The conditions for the synthesis of polycrystalline LnMn2O5 samples from [Ln2(OOCCym)4(NO3)2(DME)2] and LnMnO3 samples from [Ln(Cym-COO)(acac)2(H2O)] n were optimized, and the magnetic behavior of the synthesized LnMn2O5 (Ln = Eu, Tb, Y) and LnMnO3 (Ln = Ho, Er) phases was studied in detail within a wide range of temperatures.
Databáze: OpenAIRE
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