Enhanced piezoelectric constant and remnant polarisation in K-compensated sodium potassium bismuth titanate

The influence of volatility of potassium on piezoelectric constant of lead-free 0.8(Na0.5Bi0.5)TiO3–0.2(K0.5Bi0.5)TiO3 (NKBT20) is investigated. An excess of 0.8mol% of K2CO3 compensates the loss of potassium due to volatility. Piezoelectric constant (d33) of K-compensated NKBT20 is 215pC/N, which i...

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Bibliographic Details
Published in:Materials letters 2015-05, Vol.146, p.81-83
Main Authors: Veera Gajendra Babu, M., Abdul Kader, S.M., Muneeswaran, M., Giridharan, N.V., Pathinettam Padiyan, D., Sundarakannan, B.
Format: Article
Language:English
Subjects:
Ceramics
Constants
Ferroelectrics
Optimization
Phase boundaries
Piezoelectric materials
Piezoelectricity
Potassium
Sodium
Tuning
Volatility
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Summary:The influence of volatility of potassium on piezoelectric constant of lead-free 0.8(Na0.5Bi0.5)TiO3–0.2(K0.5Bi0.5)TiO3 (NKBT20) is investigated. An excess of 0.8mol% of K2CO3 compensates the loss of potassium due to volatility. Piezoelectric constant (d33) of K-compensated NKBT20 is 215pC/N, which is greater than that have been reported in literature. Splitting of (111) and (200) peaks confirms that the sample is of morphotrophic phase boundary composition with coexistence of rhombohedral and tetragonal phases. Remnant polarisation and coercive field are 56.7µC/cm2 and 39kV/cm respectively. Increase in piezoelectric constant and remnant polarisation is attributed to the fine tuning of rhombohedral and tetragonal phase fractions by optimum compensation of loss of potassium. Present work provides reproducible preparation procedure to enhance piezoelectric and ferroelectric properties. •Heat treatment of K2CO3 at 450°C for 1h is required to remove moisture.•Excess amount of 0.8mol% K2CO3 is optimum for compensation of K-volatility.•Splitting of 111 and 200 reflections confirm MPB composition of K-compensated NKBT20.•Highest d33 (215pC/N), large Pr (56.7μC/cm2) and low Ec (39kV/cm) are measured.•This reproducible preparation procedure unlocks difficulty on K-based piezoelectrics.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2015.01.152