The Fluoroperovskite TlMnF3

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Matthias Conrad
  • Clemens Pietzonka
  • Janek Bernzen
  • Viviana Motta
  • Karl Michael Weitzel
  • Antti Karttunen

  • Florian Kraus

Research units

  • University of Marburg

Abstract

TlMnF3 was obtained from the reduction of Tl3MnF6 under liquid ammonia, in which MnIII is obviously not redox-stable under the applied conditions. The crystal structure of TlMnF3 was determined on a single crystal using X-ray diffraction. The previously reported structure model was deduced from powder X-ray diffraction data only and therefore a much higher precision has been reached now. The compound crystallizes in the shape of colorless cubes with lattice parameters a = 4.2370(4) Å, V = 76.06(2) Å3 with Z = 1 at T = 140 K in the perovskite structure type (Pm3m, no. 221). At room temperature (T = 293 K), the lattice parameter of the slightly pink, almost colorless powderous compound is a = 4.2535(2) Å, V = 76.953(4) Å3. As the displacement parameter of the Tl atom was observed being rather large in comparison to the other atoms, the CAIT technique was used to demonstrate the mobility of the Tl cations. Additionally, quantum chemical calculations were carried out to further investigate the behavior of the Tl atoms. We calculate that most of the Tl atoms vibrate already at 75 K. Magnetic measurements showed that TlMnF3 is an antiferromagnet with TN = 82 K and a Weiss temperature θ of –151.2(2) K.

Details

Original languageEnglish
Pages (from-to)1557-1561
Number of pages5
JournalZeitschrift fur Anorganische und Allgemeine Chemie
Volume644
Issue number22
Publication statusPublished - 2018
MoE publication typeA1 Journal article-refereed

    Research areas

  • Fluorides, Magnetic properties, Manganese, Perovskite structure type, Thallium

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