Lead-free PTCR (Positive Temperature Coefficient Resistor) piezoelectric ceramic material and preparation method thereof

A piezoelectric ceramic and electric ceramic technology, applied in the field of lead-free PTCR piezoelectric ceramic material and its preparation, can solve the problem of no lead-free PTCR material, achieve good reliability and repeatability, reduce resistivity, and improve sample density Effect

Inactive Publication Date: 2015-06-10
TONGREN UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Judging from the current literature reports, there is no research on the preparation of lead-free PTCR materials under high pressure conditions.

Method used

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  • Lead-free PTCR (Positive Temperature Coefficient Resistor) piezoelectric ceramic material and preparation method thereof

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] see figure 1 , in an embodiment of the present invention, a lead-free PTCR piezoelectric ceramic material and a preparation method thereof belong to the field of lead-free electronic ceramic materials, and the general composition formula of the lead-free PTCR piezoelectric ceramic material is: (Na 0.5 Bi 0.5 ) x1 (Ba 1-x1-x2 A 2 ) Ti 1-y B y o 3 +zmol%M, where, 0.08≤x1≤0.6; 0≤x2≤0.2; 0≤y≤0.05; 0≤z≤3; A element is one or more of Sr, Ca, Y, La, Bi ...

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Abstract

The invention discloses a lead-free PTCR (Positive Temperature Coefficient Resistor) piezoelectric ceramic material and a preparation method thereof, and belongs to the field of a lead-free electronic ceramic material. The composition general formula of the lead-free PTCR piezoelectric ceramic material is (Na0.5Bi0.5)x1(Ba1-x1-x2A2) Ti1-yByO3+zmol%M, wherein x1 is greater than or equal to 0.08 and less than or equal to 0.6, x2 is greater than or equal to 0 and less than or equal to 0.2, y is greater than or equal to 0 and less than or equal to 0.05, z is greater than or equal to 0 and less than or equal to 3, the element A is one or more of Sr, Ca, Y, La and Bi, the element B is one or more of Zr, Sn, Mn, Cu, Nb and Sb, and M is one or more of oxides Al2O3, SiO2, TiO2, BaO and B2O3. According to the preparation method, a high-pressure technology is firstly adopted, the ceramic sample is prepared by sintering under the pressure condition of 4.5 GPa, the preparation period is short, and the technology is simple and controllable; and the material is stable in property and good in repeatability, can be used for industrially ultrasonic testing, underwater acoustic detection, a piezoelectric transducer, an ultrasonic motor, a display device, an electronic control multicolor filter, a sensor and the like and is widely applicable to the fields of electronic information, space equipment, medical health, household appliances and the like.

Description

technical field [0001] The invention relates to the field of lead-free electronic ceramic materials, in particular to a lead-free PTCR piezoelectric ceramic material and a preparation method thereof. Background technique [0002] PTCR ceramic material at Curie temperature T c Below, its resistivity decreases with the increase of temperature, at the Curie temperature T c When it is at the same time, it undergoes a ferroelectric-paraelectric phase transition, accompanied by a sharp increase of several orders of magnitude in resistivity. The former is called the negative temperature coefficient resistance effect (NTC effect), and the latter is called the positive temperature coefficient effect (PTC effect). In general, the PTC effect exists only in ferroelectric materials. G. Goodman confirmed in 1963 that the ceramic PTCR effect is a grain boundary effect, which consists of three elements: ferroelectric phase transition, semiconductivity and grain boundary. [0003] Most of...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/622
Inventor 李勇谭德斌石维冷森林黄帅
Owner TONGREN UNIV
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