TY - JOUR
AU - Chakrapani, Vidhya
AB - Despite the outstanding electrical, electrochemical, and optical properties of rare-earth (R)-doped nickelates (RNiO3), a bottleneck in its device applications is the need for high-pressure, typically in excess of 100 bars, to stabilize this phase during synthesis. To date, no known near-ambient pressure synthesis process exists for the synthesis of bulk RNiO3 with ionic radii of R lower than that of Nd (such as Sm, Eu, and Gd) in the lanthanide series due to the increasing thermodynamic instability of Ni3+ cations at ambient pressures. In the present study, we report a set of conditions for the successful synthesis of bulk SmNiO3 and NdNiO3 through a sol–gel synthesis procedure followed by annealing at ambient pressure to stabilize Ni3+. Rietveld refinement analysis shows the composition of crystalline SmNiO3 and NdNiO3 phases to be as high as 50 wt% and 96 wt%, respectively. Consequently, sharp, well-defined insulator–metal transitions (IMTs) involving resistance changes of 2–3 orders of magnitude could be achieved, which is comparable to that seen in high-pressure synthesized samples reported in the literature.
TI - Ambient pressure synthesis of unstable bulk phases of strongly correlated rare-earth nickelates
JF - Materials Advances
DO - 10.1039/d2ma00415a
DA - 2022-10-04
UR - https://www.deepdyve.com/lp/royal-society-of-chemistry/ambient-pressure-synthesis-of-unstable-bulk-phases-of-strongly-4Ul0hnZsZ9
SP - 7241
EP - 7247
VL - 3
IS - 19
DP - DeepDyve
ER -