Decomposition of Spinel-Type Nickel Chromium Indium Sulfides—X-Ray Powder Structure Determination

Does Low‐Level Substitution Aid in Improving Thermoelectric Properties? A Case Study of M0.1Ni0.9Cr2S4 (M = Mn, In)

“…Compared with the as-obtained Mn 0.1 Ni 0.9 Cr 2 S 4 sample, this is the consequence of more Mn atoms substituting into the partially occupied defect layers. phases differ from data reported for similar materials by Lutz et al, [31] resulting from the lower In content in the presented samples (see Table S1, Supporting Information). After quenching, only monoclinic NiCr 2 S 4 and the (Ni,In,Cr) 3-x S 4 phase are observed.…”

“…The lattice parameters of the NiCr 2 S 4 component are in agreement with those observed for pure NiCr 2 S 4 , indicating that no significant substitution of Ni or Cr by In took place. The unit cell parameters of the (Ni,In,Cr) 3 S 4 and (Ni,In,Cr) 3– x S 4 phases differ from data reported for similar materials by Lutz et al, [ 31 ] resulting from the lower In content in the presented samples (see Table S1, Supporting Information). After quenching, only monoclinic NiCr 2 S 4 and the (Ni,In,Cr) 3– x S 4 phase are observed.…”

“…The background, modeled via Rietveld refinements, is subtracted for simplicity. In the pattern of In 0.1 Ni 0.9 Cr 2 S 4 , strong reflections for (Ni,In,Cr) 3– x S 4 [ 31 ] are observed, cf. respective reflections marked with *.…”

“…Structural data for the occurring phases was obtained from ICSD84959, [20] ICSD53133, [30] ICSD626198, [34] and ICSD50893. [31] TEM: Samples for TEM were prepared as a powder on a C-lined Al grid for presintering investigations and via conventional preparation for postsintering experiments. The materials were cut from the bulk pellet and subsequently thinned using mechanical grinding, dimpling, and Ar ion polishing in a Gatan Precision Ion Polishing System (PIPS).…”

“…Structural data for the occurring phases was obtained from ICSD84959, [ 20 ] ICSD53133, [ 30 ] ICSD626198, [ 34 ] and ICSD50893. [ 31 ]…”