Re-investigation of the Cd-Ce phase diagram and structural characterization of the high-temperature phase Cd_17+2xCe_2-x (x ~ 0.02)

Autor(en)

Barbara Janina Skolyszewska-Kühberger, Thomas L. Reichmann, Martin C. J. Marker, Herta Silvia Effenberger, Herbert Ipser

Abstrakt

The complete Cd-Ce equilibrium phase diagram was investigated with a combination of powder-XRD, SEM and DTA. The presence of seven intermetallic compounds, i.e., CdCe, Cd2Ce, Cd3Ce, Cd58Ce13, Cd6Ce (resp. Cd37Ce6), Cd17Ce2 and Cd11Ce, reported previously in literature, was confirmed. A polymorphic transformation of Cd2Ce into a high-temperature modification was indicated to occur at 871 °C at the respective stoichiometric composition. The homogeneity range of both the low (γ) and high-temperature (δ) allotropic modification of Ce could be determined precisely and a limited solubility of 2.5 as well as 17 at.% Cd was derived. In addition, liquidus temperatures and all invariant reactions were examined by thermal analyses. One eutectoid reaction at 421 °C and ~15 at.% Cd as well as four eutectic reactions at ~20 at.% Cd (646 °C), 56 at.% Cd (910 °C), 77.5 at.% Cd (857 °C) and close to 100 at.% Cd (320 °C) were detected. One peritectoid reaction at 852 °C and three peritectic reactions at 730, 610 and 605 °C were recorded. Moreover, single-crystal x-ray diffraction was employed, and a complete description of the structure of Cd17+2x Ce2−x (x ~ 0.02) is given with focus on the correct defect mechanism. It turned out that vacancy formation on one of the Ce sites (Ce1) is compensated by 2 Cd atoms on Cd sites (Cd5) very close by

Organisation(en)

Institut für Funktionelle Materialien und Katalyse, Institut für Mineralogie und Kristallographie

Externe Organisation(en)

Karlsruher Institut für Technologie

Journal

Journal of Phase Equilibria and Diffusion

Band

37

Seiten

186-200

Anzahl der Seiten

15

ISSN

1547-7037

DOI

https://doi.org/10.1007/s11669-015-0441-z

Publikationsdatum

01-2016

Peer-reviewed

Ja

ÖFOS 2012

104003 Anorganische Chemie, 104011 Materialchemie, 105113 Kristallographie

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/reinvestigation-of-the-cdce-phase-diagram-and-structural-characterization-of-the-hightemperature-phase-cd172xce2x-x--002(5ffdca83-d6a3-4081-b060-3dab169c7076).html