CRYSTALLOGRAPHIC STUDY OF QUATERNARY PHASE IN THE Eu-Mn-Ge-O SYSTEM BY TEM AND SEM

Juárez-Arellano, E.A; Gamboa-Espinosa, G.U.; Lara, J.A; Bucio, L; Orozco, E

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Revista Latinoamericana de Metalurgia y Materiales

Print version ISSN 0255-6952

Abstract

JUAREZ-ARELLANO, E.A et al. CRYSTALLOGRAPHIC STUDY OF QUATERNARY PHASE IN THE Eu-Mn-Ge-O SYSTEM BY TEM AND SEM . Rev. LatinAm. Met. Mat. [online]. 2001, vol.21, n.2, pp.09-12. ISSN 0255-6952.

We have synthesized a new quaternary compound with stoichiometric formula EuMnGe₂O₇. The compound was grown up as micro-crystals into quartz tube under thermal treatment in vacuum. The structural characterization of these crystals was carried out using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). After a careful analysis we found that the new quaternary compound crystallizes in the orthorhombic system with space group A222 (No.21) and cell parameters a = 4.6(2) Å, b = 8.5(4) Å, c = 12.7(6) Å and V = 495.6 Å³.

Keywords : Europium manganese germanate; Crystal structure; TEM; SEM.

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