Facile In Situ Formation of Potassium Sodium Niobate (KNN) Using The Hexaniobate Polyoxometalate
Rambaran, Mark A. LU ; Jacobsson, Daniel LU
; Lehmann, Sebastian
LU
and Dick, Kimberly A.
LU
(2025)
In Chemistry: A European Journal
- Abstract
Lead-based piezoceramics are the dominant materials used in electronic devices, despite the known toxicity of lead. Developing safer piezoelectric materials has inspired the pursuit of lead-free piezoceramics, however some challenges remain in accessing these materials reproducibly. Here we demonstrate a simple and robust method for synthesis of the lead-free piezoceramic material, potassium sodium niobate (KxNa1-xNbO3, KNN) via an aqueous route. Stochiometric KNN (K0.5Na0.5NbO3) was prepared, by combining alkali-nitrate salts (NaNO3 and KNO3) with the hexaniobate ([HxNb6O19]8-x, Nb6) species in water, followed by heating at elevated temperatures for at least one hour. Ex situ heating of the amorphous alkali-Nb6 precursor reveals... (More)
Lead-based piezoceramics are the dominant materials used in electronic devices, despite the known toxicity of lead. Developing safer piezoelectric materials has inspired the pursuit of lead-free piezoceramics, however some challenges remain in accessing these materials reproducibly. Here we demonstrate a simple and robust method for synthesis of the lead-free piezoceramic material, potassium sodium niobate (KxNa1-xNbO3, KNN) via an aqueous route. Stochiometric KNN (K0.5Na0.5NbO3) was prepared, by combining alkali-nitrate salts (NaNO3 and KNO3) with the hexaniobate ([HxNb6O19]8-x, Nb6) species in water, followed by heating at elevated temperatures for at least one hour. Ex situ heating of the amorphous alkali-Nb6 precursor reveals stoichiometric control and phase uniformity are possible in making KNN, versus a solid-state route. In situ heating in a transmission electron microscope (TEM), with selected area electron diffraction (SAED), facilitates monitoring the real-time transformation of the amorphous alkali-Nb6 precursor, to yield monoclinic KNN, in agreement with ex situ results. Therefore, an aqueous route via hexaniobate is an attractive alternative approach for developing lead-free piezoceramic materials.
(Less)
- author
- Rambaran, Mark A.
LU
; Jacobsson, Daniel
LU
; Lehmann, Sebastian
LU
and Dick, Kimberly A.
LU
- organization
- publishing date
- 2025-01-20
- type
- Contribution to journal
- publication status
- epub
- subject
- keywords
- lead-free, hexaniobate, in situ TEM, potassium sodium niobate, polyoxometalate
- in
- Chemistry: A European Journal
- article number
- e202404417
- pages
- 11 pages
- publisher
- Wiley-Blackwell
- external identifiers
-
- pmid:39833119
- scopus:85216896059
- ISSN
- 1521-3765
- DOI
- 10.1002/chem.202404417
- project
- Exploring alternative electrochemical energy storage materials: niobium columbite minerals
- Piezoceramic Alkali-Niobates for Lead-free Applications
- Ramanspektroskopi för elektrokemisk energilagring och piezokeramik (REEP)
- language
- English
- LU publication?
- yes
- additional info
- © 2025 Wiley‐VCH GmbH.
- id
- e585c514-7a81-4ab7-8646-a6a064905d32
- date added to LUP
- 2025-01-27 09:17:51
- date last changed
- 2025-07-16 11:44:57
@article{e585c514-7a81-4ab7-8646-a6a064905d32,
abstract = {{<p>Lead-based piezoceramics are the dominant materials used in electronic devices, despite the known toxicity of lead. Developing safer piezoelectric materials has inspired the pursuit of lead-free piezoceramics, however some challenges remain in accessing these materials reproducibly. Here we demonstrate a simple and robust method for synthesis of the lead-free piezoceramic material, potassium sodium niobate (KxNa1-xNbO3, KNN) via an aqueous route. Stochiometric KNN (K0.5Na0.5NbO3) was prepared, by combining alkali-nitrate salts (NaNO3 and KNO3) with the hexaniobate ([HxNb6O19]8-x, Nb6) species in water, followed by heating at elevated temperatures for at least one hour. Ex situ heating of the amorphous alkali-Nb6 precursor reveals stoichiometric control and phase uniformity are possible in making KNN, versus a solid-state route. In situ heating in a transmission electron microscope (TEM), with selected area electron diffraction (SAED), facilitates monitoring the real-time transformation of the amorphous alkali-Nb6 precursor, to yield monoclinic KNN, in agreement with ex situ results. Therefore, an aqueous route via hexaniobate is an attractive alternative approach for developing lead-free piezoceramic materials.</p>}},
author = {{Rambaran, Mark A. and Jacobsson, Daniel and Lehmann, Sebastian and Dick, Kimberly A.}},
issn = {{1521-3765}},
keywords = {{lead-free; hexaniobate; in situ TEM; potassium sodium niobate; polyoxometalate}},
language = {{eng}},
month = {{01}},
publisher = {{Wiley-Blackwell}},
series = {{Chemistry: A European Journal}},
title = {{Facile In Situ Formation of Potassium Sodium Niobate (KNN) Using The Hexaniobate Polyoxometalate}},
url = {{http://dx.doi.org/10.1002/chem.202404417}},
doi = {{10.1002/chem.202404417}},
year = {{2025}},
}