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The Co-Al Co-doped Barium Titanate Lead-free Piezoelectric Ceramics was successfully developed by Yuhai company through repeated experiments. By Researching the influence of Co-Al Co-doping on the structure and properties of Barium Titanate-based piezoelectric ceramics, the formulation and preparation technology of Barium Titanate-based piezoelectric ceramics were optimized. Yuhai`s BaTiO3 was prepared by conventional solid-phase sintering method, with the piezoelectric constant d33 (>170pC/N), dielectric loss tgδ≤0.5% and mechanical coupling coefficient Kp≥0.34.

Barium titanate lead-free piezoelectric ceramics are important basic materials for the development of modern science and technology, which was widely used in the manufacture of ultrasonic transducers, underwater acoustic transducers, electroacoustic transducers, ceramic filters, ceramic transformers, ceramic frequency discriminators, high voltage generators, infrared detectors, surface acoustic wave devices, electro-optic devices, ignition and detonation devices, and piezoelectric gyroscope and so on.

Application: military, ocean, fishery, scientific research, mine detection, daily life and other fields.

China Patent of Yuhai company`s BaTiO3

Chinese Patent No.: ZL 2011 1 0126758.6

Name: Lead-free Barium Titanate piezoelectric material with Addition of Cobalt and Aluminum

Lead free piezo material BaTiO3			Lead-free Material
Properties			BaTiO3
Dielectric Constant	ɛ^T_r3		1260
Coupling factor	K_P		0.34
	K₃₁		0.196
	K₃₃		0.43
	K_t		0.32
Piezoelectric coefficient	d31	10^-12m/v	-60
	d33	10^-12m/v	160
	g31	10^-3vm/n	-5.4
	g33	10^-3vm/n	14.3
Frequency coefficients	N_p		3180
	N₁		2280
	N₃
	N_t		2675
Elastic compliance coefficient	S^e₁₁	10^-12m²/n	8.4
Machanical quality factor	Qm		1200
Dielectric loss factor	Tg δ	%	0.5
Density	ρ	g/cm³	5.6
Curie Temperature	Tc	°C	115
Young's modulus	Y^E₁₁	<10⁹N/m³	119
Poison Ratio			0.33