# Lead-free piezoceramics: a family tree that grows d₃₃

> A family tree of lead-free piezoelectric ceramics rooted in PZT (more than 60 wt % lead) and the perovskite skeleton all candidates share. Branches lead to potassium sodium niobate, barium titanate and bismuth sodium titanate; each landmark result is a leaf placed on a shared d₃₃ axis, from 416 pC/N (2004) to 650 pC/N in untextured KNN and 788 pC/N in textured BaTiO₃, mostly by sitting on a phase boundary where polarization rotates easily.

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- Updated: 2026-10-14
- Category: Graphical abstracts
- Method: Graphical abstract
- Starting materials: PZT, more than 60 wt % lead (Saito et al. 2004)
- Product: Lead-free perovskite ceramics with d₃₃ from 416 to 788 pC/N
- Key result: d₃₃ = 416 pC/N (textured KNN-based, Saito et al. 2004); ≈ 490 pC/N, TC 217–304 °C (Wang et al. 2014); 650 ± 20 pC/N (Tao et al. 2019); ≈ 620 pC/N (BZT–BCT, Liu & Ren 2009); 788 pC/N (textured BaTiO₃, in Zate et al. 2025)
- Figure: 1920 × 1080 px, 110 editable layers (4 generated objects with settings)

## Steps

1. **Why replace PZT**: PZT, used in sensors, actuators and other electronic devices, contains more than 60 wt % lead, which has been expelled from solder, glass and glazes over its toxicity (Saito et al. 2004)
2. **KNN**: An alkali-niobate MPB plus <001> texture gave 416 pC/N (Saito et al. 2004); a new R–T phase boundary ≈ 490 pC/N by solid-state processing (Wang et al. 2014); a slush polar state with coexisting phases 650 ± 20 pC/N, above PZT-5H (Tao et al. 2019)
3. **BaTiO₃-based**: BZT–BCT reaches ≈ 620 pC/N at an MPB that starts from a tricritical triple point (Liu & Ren 2009); BaTiO₃ textured on (110) templates reached 788 pC/N (Zate et al. 2025)
4. **Why phase boundaries work**: Where polarization anisotropy nearly vanishes, polarization rotates easily between ⟨001⟩ (tetragonal) and ⟨111⟩ (rhombohedral) directions (Liu & Ren 2009; Tao et al. 2019)
5. **Uses**: Sensors, actuators and energy harvesters, which interconvert mechanical and electrical energy (Zate et al. 2025; Saito et al. 2004)

## Uses

- Graphical abstracts on lead-free piezoelectric ceramics
- Talks on replacing PZT in sensors, actuators and harvesters
- Teaching morphotropic phase boundaries and polarization rotation

## References

1. Saito et al., “Lead-free piezoceramics”, Nature 2004. https://doi.org/10.1038/nature03028 (primary)
2. Liu & Ren, “Large piezoelectric effect in Pb-free ceramics”, Physical Review Letters 2009. https://doi.org/10.1103/PhysRevLett.103.257602 (primary)
3. Wang et al., “Giant piezoelectricity in potassium-sodium niobate lead-free ceramics”, Journal of the American Chemical Society 2014. https://doi.org/10.1021/ja500076h (primary)
4. Tao et al., “Ultrahigh Performance in Lead-Free Piezoceramics Utilizing a Relaxor Slush Polar State with Multiphase Coexistence”, Journal of the American Chemical Society 2019. https://doi.org/10.1021/jacs.9b07188 (primary)
5. Zate et al., “Textured Lead-Free Piezoelectric Ceramics: A Review of Template Effects”, Materials 2025. https://doi.org/10.3390/ma18030477 (review)

Credit: Drawn by LabCanvas after Saito et al., Nature 2004 (doi:10.1038/nature03028); Liu & Ren, Phys. Rev. Lett. 2009 (doi:10.1103/PhysRevLett.103.257602); Wang et al., J. Am. Chem. Soc. 2014 (doi:10.1021/ja500076h); Tao et al., J. Am. Chem. Soc. 2019 (doi:10.1021/jacs.9b07188) and Zate et al., Materials 2025 (doi:10.3390/ma18030477).

## Questions

**What does the “Lead-free piezoceramics: a family tree that grows d₃₃” template show?** A family tree of lead-free piezoelectric ceramics rooted in PZT (more than 60 wt % lead) and the perovskite skeleton all candidates share. Branches lead to potassium sodium niobate, barium titanate and bismuth sodium titanate; each landmark result is a leaf placed on a shared d₃₃ axis, from 416 pC/N (2004) to 650 pC/N in untextured KNN and 788 pC/N in textured BaTiO₃, mostly by sitting on a phase boundary where polarization rotates easily.

**What are the steps shown in “Lead-free piezoceramics: a family tree that grows d₃₃”?** 1. Why replace PZT: PZT, used in sensors, actuators and other electronic devices, contains more than 60 wt % lead, which has been expelled from solder, glass and glazes over its toxicity (Saito et al. 2004). 2. KNN: An alkali-niobate MPB plus <001> texture gave 416 pC/N (Saito et al. 2004); a new R–T phase boundary ≈ 490 pC/N by solid-state processing (Wang et al. 2014); a slush polar state with coexisting phases 650 ± 20 pC/N, above PZT-5H (Tao et al. 2019). 3. BaTiO₃-based: BZT–BCT reaches ≈ 620 pC/N at an MPB that starts from a tricritical triple point (Liu & Ren 2009); BaTiO₃ textured on (110) templates reached 788 pC/N (Zate et al. 2025). 4. Why phase boundaries work: Where polarization anisotropy nearly vanishes, polarization rotates easily between ⟨001⟩ (tetragonal) and ⟨111⟩ (rhombohedral) directions (Liu & Ren 2009; Tao et al. 2019). 5. Uses: Sensors, actuators and energy harvesters, which interconvert mechanical and electrical energy (Zate et al. 2025; Saito et al. 2004).

**What are the starting materials and the product?** Starting materials: PZT, more than 60 wt % lead (Saito et al. 2004). Product: Lead-free perovskite ceramics with d₃₃ from 416 to 788 pC/N.

**Which papers is “Lead-free piezoceramics: a family tree that grows d₃₃” based on?** Saito et al., “Lead-free piezoceramics”, Nature 2004 (doi:10.1038/nature03028); Liu & Ren, “Large piezoelectric effect in Pb-free ceramics”, Physical Review Letters 2009 (doi:10.1103/PhysRevLett.103.257602); Wang et al., “Giant piezoelectricity in potassium-sodium niobate lead-free ceramics”, Journal of the American Chemical Society 2014 (doi:10.1021/ja500076h); Tao et al., “Ultrahigh Performance in Lead-Free Piezoceramics Utilizing a Relaxor Slush Polar State with Multiphase Coexistence”, Journal of the American Chemical Society 2019 (doi:10.1021/jacs.9b07188); Zate et al., “Textured Lead-Free Piezoelectric Ceramics: A Review of Template Effects”, Materials 2025 (doi:10.3390/ma18030477).

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