Affordable Access

Access to the full text

123 Phases in Ce-La-Nd-2Cu-Mg-O and Ce-2Nd-2Cu-Mg-O samples

Authors
  • Stukan, R. A.1
  • Vnukova, L. V.1
  • Dudareva, T. V.1
  • Kil’yanov, Yu. N.1
  • Polyakova, A. V.1
  • 1 Russian Academy of Sciences, Semenov Institute of Chemical Physics, ul. Kosygina 4, Moscow, 119991, Russia , Moscow (Russia)
Type
Published Article
Journal
Russian Journal of Inorganic Chemistry
Publisher
Nauka/Interperiodica
Publication Date
Jan 01, 2006
Volume
51
Issue
1
Pages
5–8
Identifiers
DOI: 10.1134/S0036023606010025
Source
Springer Nature
Keywords
License
Yellow

Abstract

We show that the substitution of lanthanum by neodymium, whose oxide melts at a temperature 500°C lower than La2O3, appreciably facilitates the synthesis of 123 phases with their Cu(1) positions fully or selectively substituted by magnesium. 123 phases with unit cells doubled in plane ab (phases “336”) and with compositions close to Ce2(La1.4Nd2Ba0.6){ Cu3.42+ Cu0.63+ } [Mg2]O16 (a = b = 0.5498(5) nm, c = 1.6425(8) nm), and Ce2(La1.7Nd2K0.3){ Cu3.42+ Cu0.63+ } [Mg2]O16 (a = b = 0.5498(5) nm, c = 1.6488(8) nm), and Ce2(Nd3.4Ba0.6){ Cu3.42+ Cu0.63+ } [Mg2]O16 (a = b = 0.5474(5) nm, c = 1.6425 nm), where the parentheses indicate the Ba positions, the braces indicate the Cu(2) positions, and the brackets indicate the Cu(1) positions, were synthesized using modified nitrate technology at 810°C in flowing oxygen. The existence of Cu3+ in the Cu(2) positions endows the phases with electrical conductivity. The conductivity versus temperature curves show the semiconductor trend. The samples do not experience superconducting transitions up to 60 K.

Report this publication

Statistics

Seen <100 times