Extensive A-Site Magnesium Solubility in Perovskite Oxides via Precursor-mediated Synthesis Pathways
- 1Department of Materials Science and Engineering
- 2North Carolina State University
- 3Analytical Instrumentation Facility
Abstract
Incorporation of Mg 2+ on the A-site of ABO 3 perovskite oxides such as BaTiO 3 and SrTiO 3 has been limited by severe ionic size differences of the A-site cations with some reports claiming <1% substitution possible. Here, we demonstrate a precursor-mediated synthesis pathway to achieve extensive A-site Mg 2+ substitution in perovskite oxides – up to 50 mol%. By leveraging binary and ternary metal carbonates that are chemically mixed at the crystallographic scale, barriers associated with conventional solid-state reactions are bypassed. Specifically, we show that norsethite-type precursors such as BaMg(CO 3 ) 2 and Ba 0.5 Sr 0.5 Mg(CO 3 ) 2 react with TiO 2 to yield single-phase cubic perovskites Ba 0.5 Mg 0.5 TiO 3 and Ba 0.25 Sr 0.25 Mg 0.5 TiO 3 at temperatures as low as 640°C. This work highlights crystallographic-scale chemical mixing of carbonates as a generalizable route for accessing kinetically trapped, metastable oxides that are far from equilibrium.
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BibTeX
@misc{jones2026extensive,
title = {{Extensive A-Site Magnesium Solubility in Perovskite Oxides via Precursor-mediated Synthesis Pathways}},
author = {Jacob L. Jones and Jennifer S. Forrester and Thomas Rowe},
howpublished = {ChemRxiv},
year = {2026},
month = sep,
doi = {10.26434/chemrxiv.15008363/v1},
url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008363/v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - Extensive A-Site Magnesium Solubility in Perovskite Oxides via Precursor-mediated Synthesis Pathways
AU - Jacob L. Jones
AU - Jennifer S. Forrester
AU - Thomas Rowe
PY - 2026
DA - 2026/09/06
PB - ChemRxiv
DO - 10.26434/chemrxiv.15008363/v1
UR - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008363/v1
AB - Incorporation of Mg 2+ on the A-site of ABO 3 perovskite oxides such as BaTiO 3 and SrTiO 3 has been limited by severe ionic size differences of the A-site cations with some reports claiming <1% substitution possible. Here, we demonstrate a precursor-mediated synthesis pathway to achieve extensive A-site Mg 2+ substitution in perovskite oxides – up to 50 mol%. By leveraging binary and ternary metal carbonates that are chemically mixed at the crystallographic scale, barriers associated with conventional solid-state reactions are bypassed. Specifically, we show that norsethite-type precursors such as BaMg(CO 3 ) 2 and Ba 0.5 Sr 0.5 Mg(CO 3 ) 2 react with TiO 2 to yield single-phase cubic perovskites Ba 0.5 Mg 0.5 TiO 3 and Ba 0.25 Sr 0.25 Mg 0.5 TiO 3 at temperatures as low as 640°C. This work highlights crystallographic-scale chemical mixing of carbonates as a generalizable route for accessing kinetically trapped, metastable oxides that are far from equilibrium.
ER -