High temperature phase transition of the magnetoelectric double perovskite Sr2NiMoO6 by neutron diffraction

Physicochemical Properties of Potential Cathode La1-xBaxMn1-yCryO3 and Anode Sr2NiMoO6 Materials for Solid-Oxide Fuel Cells

“…4, this increase occurred at T = 504 and 513 K on the temperature dependence of the relative lengthening of Sr 2 NiMoO 6 obtained in heating and cooling regimes, respectively. Thus, we concluded that the crystal phase transition from tetragonal to cubic in Sr 2 NiMoO 6 occurs at a temperature nearly of 508 K. This result differs from that obtained earlier in neutron diffraction data [18] (T = 550 K) and that obtained for the relative lengthening of Sr 2 NiMoO 6 (T = 495 K) [8]. The data difference must be occurred due to various rate of the sample heating, which is responsible for the equilibrium state reaching.…”

“…In the present work we decided to specify the phase composition of Sr 2 NiMoO 6 sample with the neutron powder diffraction using necessity. Besides data on the temperature of the structure transition in Sr 2 NiMoO 6 obtained earlier in [18] and [8] did not coincided pointing on 550 and 495 K correspondingly.…”

“…The main phase Sr 2 NiMoO 6 was indexed on the base of the space group I4/m, with the tetragonal lattice parameters a = 5.5497 (2) and c = 7.8956(5) Å. This finding is in good agreement only with [18]. However, Sr 2 NiMoO 6 in [17] was indexed on the base of space group I 1 − and in [19] space group was not specified yet.…”

“…Analyzes of the published articles showed that crystal structure and the physical chemical properties of Sr 2 NiMoO 6 sample were investigated mostly earlier [8,[17][18][19] but despite this the existing data have not been consistent. According to [8,19], Sr 2 NiMoO 6 in air exhibits a homogenous tetragonal phase; however, according to [17,18], Sr 2 NiMoO 6 always contains an impurity phase, SrMoO 4 . By the way the presence SrMoO 4 in the synthesized sample put questions about stoichiometric composition of the sample.…”

“…The data difference must be occurred due to various rate of the sample heating, which is responsible for the equilibrium state reaching. In [18] the sample heating rate was not noticed yet, whereas in [8] mode of data obtaining was not specified. Our result and result obtained in [8] are close owing to equal heating rate.…”