Crystal and electronic structures of one-dimensional transition metal thiophosphates: ANB2PS10 (A=Na, Ag)

Eun Young Goh, Sung Jin Kim, Dongwoon Jung

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

A new quaternary compound NaNb2PS10 was prepared by reacting the mixture of Nb, P2S5, S and Na2S at 750°C. AgNb2PS10 was also synthesized by the direct solid-state reaction of Ag, Nb, P and S at 900°C. Their structures were determined by single-crystal X-ray diffraction method. The needle-shape crystals of the two compounds crystallize in the common monoclinic space group C2/c. NaNb2PS10 crystallizes into purple crystals with cell dimensions of a = 24.7634(10) Å, b = 7.8407(11) Å, c = 12.947(3) Å, β = 90.83(2)° and Z = 8. AgNb2PS10 had dark-gray crystals with cell dimensions of a = 23.9609(10) Å, b = 7.7692(11) Å, c = 12.910(3) Å, β = 94.49(2)° and Z = 8. These structures consist of one-dimensional infinite chains built by [Nb2S12] and [PS4] units. The Nb atoms are centered in distorted bicapped trigonal prismatic polyhedra and the neighboring polyhedra share square faces and edges to make Nb-Nb pairs. [PS4] units are tetrahedra composed of one S atom at the prism corner and two other capping S atoms and an additional S atom. Ag+ and Na+ cations in NaNb2PS10 and AgNb2PS10 reside in the van der Waals gap of sulfur atoms between infinite chains. Calculation of the electronic structure shows that the two compounds are semiconducting materials. Optically measured band gaps were 1.72 and 1.77 eV for NaNb2PS10 and AgNb2PS10, respectively.

Original languageEnglish
Pages (from-to)119-125
Number of pages7
JournalJournal of Solid State Chemistry
Volume168
Issue number1
DOIs
StatePublished - Oct 2002

Keywords

  • -S-S- bridges
  • Electron transfer
  • Intercalated compounds
  • Low-dimensional structures
  • Thiophosphates

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