Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A bismuth sodium barium titanate and lead-free piezoelectric technology, applied in ceramics, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve the problems of difficult polarization and practical application, and achieve excellent piezoelectricity The effect of electric ferroelectric performance, excellent performance and stable process
Inactive Publication Date: 2006-06-21
SICHUAN UNIV
View PDF6 Cites 0 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
Simple Bi 0.5 Na 0.5 TiO 3 Ceramic coercive field is extremely large (73Kv / cm), polarization is difficult, and it is difficult to be practical, so Bi 0.5 Na 0.5 TiO 3 Modification to obtain lead-free piezoelectric ceramic system with low coercive field and good piezoelectric ferroelectric performance
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0013] formula:
[0014] 0.915 Bi 0.5 Na 0.5 TiO 3 +0.085(Ba 0.7 Sr 0.18 Ca 0.12 )TiO 3
[0015] performance:
[0016] d 33 (pC / N) tg δ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio
[0017] 147 2.0 729 29.7 153 0.292
Embodiment 2
[0019] formula:
[0020] 0.935 Bi 0.3 Na 0.7 TiO 3 +0.065(Ba 0.62 Sr 0.23 Ca 0.15 )TiO 3
[0021] performance:
[0022] d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio
[0023] 105 1.2 502 27.0 258 0.292
Embodiment 3
[0025] formula:
[0026] [0.9Bi 0.5 Na 0.5 TiO 3 +0.1(Ba 0.6 Sr 0.3 Ca 0.1 )TiO 3 ](95wt%)+Li 2 O (5wt%)
[0027] performance:
[0028] d 33 (pC / N) tgδ(%) ε 33 / ε 0 k p (%) Qm Poisson's ratio
[0029] 162 2.5 984 25.4 126 0.295
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
PUM
Property
Measurement
Unit
Curie point
aaaaa
aaaaa
piezoelectric charge coefficient
aaaaa
aaaaa
Login to View More
Abstract
The invention relates to a lead-free piezoelectric ceramic of bismuth sodium barium strontium calcium titanate, relates to a novel multi-element lead-free piezoelectric ceramic composition, and belongs to the field of perovskite structure-environment coordination piezoelectric ceramics. The lead-free piezoelectric ceramic that the present invention proposes can use general formula (1-z) Bi (1-w) Na w TiO 3 +z(Ba 1-x-y Sr x Ca y )TiO 3 +aM α o β (wt%), where 0<x<1, 0<y<1, 0<z<1, 0<(x+y)<1, 0.3≤w≤0.7, M α o β It is one or more doped oxides whose content a accounts for the main component (1-z) Bi (1-w) Na w TiO 3 +z(Ba 1-x-y Sr x Ca y )TiO 3 The weight ratio is 0-10%, M is an element with a valence of +1-+6 and can form a solid oxide with oxygen, such as Na, K, Li, Ni, Zn, Cr, Co, Nb, Ta, Al, Cu , Fe, Ce, Pr, Nd, Sm, Gd, Dy, Er, Yb, In, Y, Sc, La, Ho, Lu, Sn, Sb, Mn, Ca, Ba, Sr, Mg, Si, etc., α and β denotes the number of atoms of the corresponding element M and oxygen in the relevant oxide, respectively. The system piezoelectric ceramic composition d 33 Up to 160pC / N or more, k p It can reach more than 30.0%, its process is stable, it can be obtained by using traditional piezoelectric ceramic preparation technology and industrial raw materials, and it has practicability.
Description
1. Technical field [0001] The invention relates to a novel multi-component lead-free piezoelectric ceramic composition, which belongs to the field of piezoelectric ceramics with perovskite structure and environment coordination. 2. Background technology [0002] Since the discovery of the piezoelectricity of barium titanate ceramics in the mid-1940s, the structural characteristics are ABO 3 The research and development of piezoelectric ceramics is very active. Piezoelectric ceramics and their components have been widely used in industry, especially in the field of information industry. Lead zirconate titanate (Pb(Ti, Zr)O 3 ) as the representative lead-based binary system, the A site is Pb; the B site is Ti, Zr and lead magnesium niobate-lead titanate [Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 ] as the base material, add the third component, such as lead magnesium niobate (Pb (Mg 1 / 3 Nb 2 / 3 )O 3 ) as a representative, the A position is Pb, and the B position is Mg 1 / 3 Nb 2 / 3 ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.