Investigation on the Correlation between Piezoelectricity and Its Thermal Behavior with Depolarization Temperature and Antiferroelectric Order in Niobium‐Doped (Na0.41K0.09Bi0.5)TiO3: A Lead‐Free Piezoelectric. Issue 10 (16th July 2021)

• Record Type: Journal Article
• Authors: Sharma, Ankur; Bhaumik, Indranil; Singh, Gurvinderjit; Sagar Tiwari, Vidya
• Is Part Of: Physica status solidi. Volume 258:Issue 10(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-07-16
• Subjects: electronic materials -- piezoelectricity -- X-ray diffraction -- ferroelectricity; Solid state physics -- Periodicals; Solids -- Periodicals; Atomic structure -- Periodicals; 530.41
• DOI: 10.1002/pssb.202100155
• Languages: English
• ISSNs: 0370-1972

Abstract

Abstract : A correlation between piezoelectric response and its thermal stability with the depolarization temperature and antiferroelectric order in (Na0.41 K0.09 Bi0.5 )(1− x /2) (Ti1− x Nb x )O3 ( x = 0.00–0.0150) ceramic is investigated. A reasonable increase in the piezoelectric response (20–25%) is observed in a limited composition range (0.0050 ≤ x ≤ 0.010). The piezoelectric thermal stability for the lower niobium concentrations ( x < 0.010) is found to be reasonably better than many archetypal lead‐free piezoelectrics. However, a significant thermal instability is observed for the higher niobium content ( x ≥ 0.010). The observed thermal instability is attributed to the monotonic decrease in the depolarization temperature with the emergence of antiferroelectric ordering in the vicinity of the ferroelectric‐relaxor crossover region. The increase in the piezoelectric response in the aforementioned composition range is associated with the competition among the ferroelectric domain wall movement and the antiferroelectric order. The outcome of the current study reveals that (Na0.41 K0.09 Bi0.5 )(1− x /2) (Ti1− x Nb x )O3 with x = 0.005 is a useful lead‐free piezoelectric with consistent thermal response. Abstract : The effect of niobium doping (0–1.5 mol%) on the piezoelectric response and its thermal stability is investigated for lead‐free [Bi0.5 Na0.41 K0.09 ]TiO3 . The piezoelectric coefficients increase with temperature and fall rapidly near the depolarization temperature. The thermal stability of piezoelectric coefficients is found to decrease rapidly for ≥1.0 mol% niobium concentration.