An enhanced mechanical quality factor and a low dielectric loss in lithium sodium niobate lead-free ceramics

Lead-free piezoelectric ceramics of (Na0.8K0.2)0.5Bi0.5TiO3+x wt.% Mn (abbreviated as NBKT-x% Mn, x=0~0.5) were synthesized by solid-state reaction. The grain growth of the ceramics was restrained by Mn-doping at a certain extent. The mechanical quality factor Qm increases and the dielectric loss tanδ decreases with the increase of Mn-doping. Best piezoelectric properties were obtained for the composition of NKBT-0.2%Mn: d33=158 pC·N-1, tanδ=2.9% at 1 kHz, Qm=110 and kp=30%. The P-E loops show that remnant polarization Pr and coercive field Ec decrease slightly with the amount of the Mn2+ increasing up to 0.2wt.% and then increase as the content of Mn2+ increases further. NKBT-0.5wt. % Mn exhibits strong ferroelectricity with remnant polarization Pr = 38μC/cm2.

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The property improvement of lead-free Li0.058 (K0.535Na0.48) 0.966 (Nb0.9Ta0.1) O3-based (LKNNT-based) piezoelectric ceramics with high mechanical quality factor (Qm)

2018 IEEE International Conference on Applied System Invention (ICASI) ◽

10.1109/icasi.2018.8394417 ◽

2018 ◽

Author(s):

Ching-Hsing Pei ◽

Ming-Chang Kuan ◽

Bau-Yi Lee

Keyword(s):

Quality Factor ◽

Piezoelectric Ceramics ◽

Mechanical Quality Factor ◽

Lead Free ◽

Mechanical Quality ◽

Quality Factor Q

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Enhanced piezoelectric activity in high-temperature Bi1−x−ySmxLayFeO3 lead-free ceramics

Journal of Materials Chemistry C ◽

10.1039/c5tc00363f ◽

2015 ◽

Vol 3 (15) ◽

pp. 3684-3693 ◽

Cited By ~ 34

Author(s):

Ting Zheng ◽

Jiagang Wu

Keyword(s):

High Temperature ◽

Dielectric Loss ◽

Lead Free ◽

Piezoelectric Activity ◽

Low Dielectric ◽

Lead Free Ceramics

In this work, a high piezoelectric activity (d33∼50 pC N−1) and a low dielectric loss (tan δ∼0.43%) have been obtained in high-temperature Bi1−x−ySmxLayFeO3 piezoceramics with x = 0.025 and y = 0.05.

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High-Power Piezoelectric Characteristics of Sr2Bi4Ti5O18-Ca2Bi4Ti5O18-Based Ferroelectric Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.485.93 ◽

2011 ◽

Vol 485 ◽

pp. 93-96 ◽

Cited By ~ 1

Author(s):

Yoji Noumura ◽

Shigeki Sato ◽

Yuji Hiruma ◽

Hajime Nagata ◽

Tadashi Takenaka

Keyword(s):

High Power ◽

Mechanical Quality Factor ◽

Power Measurement ◽

Lead Free ◽

Ferroelectric Ceramics ◽

Vibration Velocity ◽

Lead Free Ceramics ◽

Mechanical Quality ◽

Mn Doped ◽

Piezoelectric Characteristics

The high-power piezoelectric characteristics of lead-free piezoelectric ceramics, based on a bismuth layer-structured ferroelectric, MnCO3-doped (Sr0.7Ca0.3)2Bi4Ti5O18(abbreviated as SCBT0.3 + Mnxwt%), were studied. SCBT0.3 + Mnxwt% lead-free ceramics showed an extremely high mechanical quality factor (Qm) of more than 3000 in the (33) vibration mode under small-amplitude vibration. The high-power piezoelectric characteristics of SCBT0.3 + Mnxwt% were measured using the high-power measurement method based on frequency sweep driving under a constant voltage condition. It was found that the vibration velocityv0-pof SCBT0.3 + Mn 0.2 wt% linearly increased up to approximately 3.0 m/s. Therefore, the Mn-doped SCBT0.3-based ceramics are a promising candidate for lead-free high-power applications.

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