Molecularly Engineered Nitrate Double Perovskites with Elevated Ferroelectric Phase Transition Temperature and Large Piezoelectric Response
4 affiliations
- 1Department of Chemistry Southern University of Science and Technology Shenzhen China
- 2SUSTech Energy Institute For Carbon Neutrality Southern University of Science and Technology Shenzhen China
- 3Chaotic Matter Science Research Center Jiangxi Province Key Laboratory of Functional Crystalline Materials Chemistry International Institute for Innovation Jiangxi University of Science and Technology Ganzhou China
- 4MOE Key Laboratory of Bioinorganic and Synthetic Chemistry IGCME School of Chemistry Sun Yat‐sen University Guangzhou China
Abstract
Conventional ABX 3 perovskites place organic species at A‐sites or as X‐site linkers, where the B‐site is reserved for metals. Molecular double perovskites with a general formula A 2 B I B III X 6 possess higher tunability and distinct B I‐sites that can accommodate small cations, further regulating lattice connectivity and physical properties. Here, we introduce a new family of B I‐site‐organic nitrate double perovskites, (RM3HQ)2 B IEu(NO3)6 (RM3HQ = (R)‐N‐methyl‐3‐hydroxyquinuclidinium), forming compounds 1 – 4 with B I = ammonium, methylammonium, formamidinium, and dimethylammonium, respectively. Compounds 1 and 2 adopt mixed corner‐/face‐sharing non‐perovskite structures, whereas 3 and 4 form double perovskites. This structural variation raises the ferroelectric phase‐transition temperature to 349 K in 4 and 414 K in 3, much higher than that of the inorganic analogue (T c = 285 K). This further widens the temperature margin for stable room‐temperature piezoelectric responses, as demonstrated in 3 by ferroelectric hysteresis loops, ferroelastic domains, and a large piezoelectric coefficient (|d 33| ≈ 56 pC N−1). During these phase transitions, the Eu3+ photoluminescence intensity ratio (616 nm/ 592 nm) increases from 0.32 to 2.92 in 3 and from 0.37 to 4.59 in 4, reflecting transition‐related changes in the ligand field. This work highlights the B I‐site as an effective handle for tuning ferroelectric phase‐transition temperatures and tunable Eu3+ photoluminescence.
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BibTeX
@article{ye2026molecularly,
title = {{Molecularly Engineered Nitrate Double Perovskites with Elevated Ferroelectric Phase Transition Temperature and Large Piezoelectric Response}},
author = {Le Ye and Guang‐Yuan Hu and Yarou Duan and Yutong Lin and Ding‐Chong Han and Zi‐Luo Fang and Zhe Dong and Wei‐Xiong Zhang and Liang‐Han Shen and Na Wang and Le‐Ping Miao and Heng‐Yun Ye and Lingling Mao},
journal = {Advanced Science},
year = {2026},
month = oct,
doi = {10.1002/advs.78404},
url = {https://doi.org/10.1002/advs.78404},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Molecularly Engineered Nitrate Double Perovskites with Elevated Ferroelectric Phase Transition Temperature and Large Piezoelectric Response
AU - Le Ye
AU - Guang‐Yuan Hu
AU - Yarou Duan
AU - Yutong Lin
AU - Ding‐Chong Han
AU - Zi‐Luo Fang
AU - Zhe Dong
AU - Wei‐Xiong Zhang
AU - Liang‐Han Shen
AU - Na Wang
AU - Le‐Ping Miao
AU - Heng‐Yun Ye
AU - Lingling Mao
PY - 2026
DA - 2026/10/26
JO - Advanced Science
DO - 10.1002/advs.78404
UR - https://doi.org/10.1002/advs.78404
AB - Conventional ABX 3 perovskites place organic species at A‐sites or as X‐site linkers, where the B‐site is reserved for metals. Molecular double perovskites with a general formula A 2 B I B III X 6 possess higher tunability and distinct B I‐sites that can accommodate small cations, further regulating lattice connectivity and physical properties. Here, we introduce a new family of B I‐site‐organic nitrate double perovskites, (RM3HQ)2 B IEu(NO3)6 (RM3HQ = (R)‐N‐methyl‐3‐hydroxyquinuclidinium), forming compounds 1 – 4 with B I = ammonium, methylammonium, formamidinium, and dimethylammonium, respectively. Compounds 1 and 2 adopt mixed corner‐/face‐sharing non‐perovskite structures, whereas 3 and 4 form double perovskites. This structural variation raises the ferroelectric phase‐transition temperature to 349 K in 4 and 414 K in 3, much higher than that of the inorganic analogue (T c = 285 K). This further widens the temperature margin for stable room‐temperature piezoelectric responses, as demonstrated in 3 by ferroelectric hysteresis loops, ferroelastic domains, and a large piezoelectric coefficient (|d 33| ≈ 56 pC N−1). During these phase transitions, the Eu3+ photoluminescence intensity ratio (616 nm/ 592 nm) increases from 0.32 to 2.92 in 3 and from 0.37 to 4.59 in 4, reflecting transition‐related changes in the ligand field. This work highlights the B I‐site as an effective handle for tuning ferroelectric phase‐transition temperatures and tunable Eu3+ photoluminescence.
SN - 2198-3844
ER -