DOI

Neodymium nickelates Nd2Ni1-xO4+δ with Ni non-stoichiometry, varied in a wide x range of 0.0–0.08, are synthesized for the first time, and their properties are studied depending on the Ni content. The limit of Ni deficiency is found to reach 6%. According to the XRD data, the materials of the Nd2Ni1-xO4+δ series are single-phase in the range of x from 0.0 to 0.06 and exhibit an orthorhombic structure with a Fmmm space group. Results of the TGA-DSC studies shows that the temperature of the Fmmm – I4/mmm phase transition changes insignificantly (up to ∼5 °C), thus does not depend on Ni non-stoichiometry. The Raman scattering studies reveal that at low Ni deficiency the Raman spectra are typical for the Ni-stoichimetric oxidized (δ ≈ 0.2) Nd2NiO4+δ. While at the limiting value of x equal to 0.06, the lattice disorder and [NiO6] octahedral distortions reach a maximum feasibility with Ni–O1 vibrations getting involved into Raman scattering. The highest total conductivity (101 S/cm at the maximum) is observed for the sample with x = 0.02, which shows a more pronounced second-order overtone at 800–930 cm−1 in Raman scattering. This material can be recommended for further studies and possible electrochemical applications as the most prospective in the series due to its superior electrical properties.
Язык оригиналаАнглийский
Номер статьи116082
ЖурналSolid State Ionics
Том389
DOI
СостояниеОпубликовано - 2023

    Предметные области WoS

  • Химия, Физическая
  • Физика, Конденсированных сред

    Предметные области ASJC Scopus

  • Химия в целом
  • Материаловедение в целом
  • Condensed Matter Physics

ID: 33316434