JP3867320B2 - Piezoelectric ceramic composition - Google Patents
Piezoelectric ceramic composition Download PDFInfo
- Publication number
- JP3867320B2 JP3867320B2 JP16159296A JP16159296A JP3867320B2 JP 3867320 B2 JP3867320 B2 JP 3867320B2 JP 16159296 A JP16159296 A JP 16159296A JP 16159296 A JP16159296 A JP 16159296A JP 3867320 B2 JP3867320 B2 JP 3867320B2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric ceramic
- piezoelectric
- ceramic composition
- mol
- piezoelectric constant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Description
【０００１】
【発明の属する技術分野】
本発明は圧電体磁器組成物、特に圧電／電歪特性を利用したアクチュエータ用材料として有用な圧電体磁器組成物に関する。
【０００２】
【従来の技術】
従来より、圧電体磁器組成物としては、ＰｂＴｉＯ3 −ＰｂＺｒＯ3 系に、ＰｂＭ1-x Ｎx Ｏ3 （但し、ＭはＮｂ又はＷであり、ＮはＺｎ、Ｍｇ、Ｃｏ、Ｍｎ又はＮｉである。）で表わされる第３成分を添加したり、Ｐｂの一部をＢａ、Ｓｒ、Ｃａなどで置換したものなどが用いられている。
【０００３】
又、特開昭４９−１２２５１２号公報及び特開昭６２−１７０６５号公報には、ＰｂＴｉＯ3 −ＰｂＺｒＯ3 −Ｐｂ（Ｍｇ1/3 Ｎｂ2/3 ）Ｏ3 −Ｐｂ（Ｎｉ1/3 Ｎｂ2/3 ）Ｏ3 系において、各主成分の割合を限定した特定組成について開示されている。
【０００４】
【発明が解決しようとする課題】
ところで、圧電アクチュエータ用材料として使用する圧電体磁器組成物は、誘電率、径方向電気機械結合係数及び圧電定数に優れたものが好ましく、なかでも圧電定数が大きいことが特に必要とされている。
【０００５】
しかしながら、上述のような従来の圧電体磁器組成物では、十分大きな圧電定数が得られないという問題点を有していた。
【０００６】
例えば、上述の特開昭４９−１２２５１２号公報及び特開昭６２−１７０６５号公報に開示の、ＰｂＴｉＯ3 −ＰｂＺｒＯ3 −Ｐｂ（Ｍｇ1/3 Ｎｂ2/3 ）Ｏ3−Ｐｂ（Ｎｉ1/3 Ｎｂ2/3 ）Ｏ3 系における特定組成においても、市場の要求に比べて、得られる圧電体磁器の圧電定数は未だ不十分なものであった。
【０００７】
そこで、本発明の目的は、圧電アクチュエータ用材料として特に有用な、圧電定数の大きな圧電体磁器組成物を提供することにある。
【０００８】
【課題を解決するための手段】
上記目的を達成するため、本発明の圧電体磁器組成物は、一般式、ａＰｂＴｉＯ3 −ｂＰｂＺｒＯ3 −ｃＰｂ（Ｍｇ1/3 Ｎｂ2/3 ）Ｏ3 −ｄＰｂ（Ｎｉ1/3 Ｎｂ2/3 ）Ｏ3 で表わされる磁器組成物において、３４≦ａ≦４０、１７≦ｂ≦２３、１５≦ｃ≦２８、１５≦ｄ≦２８（但し、ａ、ｂ、ｃ及びｄはモル％、ａ＋ｂ＋ｃ＋ｄ＝１００）であることを特徴とする。
【０００９】
ここで、上記した組成範囲に限定したのは次のような理由による。
即ち、ＰｂＴｉＯ3 量ａが３４モル％未満の場合には、キュリ−温度が低下するとともに圧電定数が小さくなり好ましくない。一方、ＰｂＴｉＯ3 量ａが４０モル％を超えると、圧電定数が小さくなり好ましくない。
【００１０】
又、ＰｂＺｒＯ3 量ｂが１７モル％未満の場合には、圧電定数が小さくなり好ましくない。一方、ＰｂＺｒＯ3 量ｂが２３モル％を超えると、キュリ−温度が低下するとともに圧電定数が小さくなり好ましくない。
【００１１】
又、Ｐｂ（Ｍｇ1/3 Ｎｂ2/3 ）Ｏ3 量ｃが１５モル％未満又は２８モル％を超えると、共に圧電定数が小さくなり好ましくない。
【００１２】
さらに、Ｐｂ（Ｎｉ1/3 Ｎｂ2/3 ）Ｏ3 量ｄが１５モル％未満の場合には、圧電定数が小さくなり好ましくない。一方、Ｐｂ（Ｎｉ1/3 Ｎｂ2/3 ）Ｏ3 量ｄが２８モル％を超えると、キュリ−温度が低下するとともに圧電定数が小さくなり好ましくない。
【００１３】
【発明の実施の形態】
以下、本発明の圧電体磁器組成物の実施の形態を、実施例に基づいて説明する。
【００１４】
まず、出発原料として、ＰｂＯ、ＺｒＯ2 、ＴｉＯ2 、Ｎｂ2 Ｏ5 、ＮｉＯ、Ｍｇ（ＯＨ）2 の粉末を用意した。その後、これら粉末を、表１に示す組成の磁器が得られるように秤量し、水を加えてボールミルで湿式混合した後、９００℃で２時間仮焼した。
【００１５】
【表１】
その後、得られた仮焼物をボールミルで湿式粉砕した後、バインダを添加して造粒した。この造粒粉を１．５ｔｏｎ／ｃｍ2 の圧力で３４ｍｍ×２４ｍｍ×１．１ｍｍ（厚さ）に成形した後、１２４０℃で２時間焼成して角板状磁器を得た。その後、角板状磁器の両面を厚さ０．６ｍｍにラッピングし、その両面に銀電極を焼き付けした後、接着剤で２枚貼り合わせた。次いで、これを３０ｍｍ×３ｍｍ×１．２ｍｍ（厚さ）に切断して素子を得た。その後、得られた素子に、８０℃のシリコンオイル中で３ｋＶ／ｍｍの電界を印加して分極処理を行なった。
【００１７】
次に、以上のようにして得られた素子について、誘電率（ε33）、電気機械結合係数（Ｋｐ）、圧電定数（ｄ31）を求めた。なお、誘電率（ε33）は、静電容量を測定して計算により求めた。電気機械結合係数（Ｋｐ）は、インピーダンス測定器により共振、反共振周波数を測定して計算により求めた。圧電定数（ｄ31）は、２ｋＶ／ｍｍの大電界を印加してユニモルフ駆動させたときの変位量を測定して計算により求めた。
【００１８】
以上の結果を表２に示す。なお表２において＊印を付したものは本発明の範囲外のものであり、その他はすべて本発明の範囲内のものである。
【００１９】
【表２】
表２に示す通り、本発明の範囲内のものは、試料番号１３、１４、１５に示す本発明の範囲外のものと比較して、特に圧電定数（ｄ31）が大きく、優れている。
【００２１】
【発明の効果】
以上の説明で明らかなように、本発明によれば、ＰｂＴｉＯ3 −ＰｂＺｒＯ3−Ｐｂ（Ｍｇ1/3 Ｎｂ2/3 ）Ｏ3 −Ｐｂ（Ｎｉ1/3 Ｎｂ2/3 ）Ｏ3 系における各成分の比率を特定範囲に限定したことにより、アクチュエータ用材料として有用な、圧電定数の大きい圧電体磁器組成物が得られる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a piezoelectric ceramic composition, and more particularly to a piezoelectric ceramic composition useful as an actuator material utilizing piezoelectric / electrostrictive characteristics.
[0002]
[Prior art]
Conventionally, piezoelectric ceramic compositions include PbTiO 3 -PbZrO 3 series, PbM 1-x N x O 3 (where M is Nb or W, and N is Zn, Mg, Co, Mn or Ni). Or the like in which a part of Pb is partially substituted with Ba, Sr, Ca, or the like.
[0003]
Further, JP-A-49-122512 and JP 62-17065, PbTiO 3 -PbZrO 3 -Pb ( Mg 1/3 Nb 2/3) O 3 -Pb (Ni 1/3 Nb 2 / 3 ) In the O 3 system, a specific composition in which the ratio of each main component is limited is disclosed.
[0004]
[Problems to be solved by the invention]
By the way, the piezoelectric ceramic composition used as the material for the piezoelectric actuator is preferably excellent in dielectric constant, radial electromechanical coupling coefficient and piezoelectric constant, and particularly required to have a large piezoelectric constant.
[0005]
However, the conventional piezoelectric ceramic composition as described above has a problem that a sufficiently large piezoelectric constant cannot be obtained.
[0006]
For example, disclosed in JP 49-122512 and JP 62-17065 discloses the above, PbTiO 3 -PbZrO 3 -Pb (Mg 1/3 Nb 2/3) O 3 -Pb (Ni 1 / Even in the specific composition in the 3 Nb 2/3 ) O 3 system, the piezoelectric constant of the obtained piezoelectric ceramic was still insufficient as compared with the market demand.
[0007]
Accordingly, an object of the present invention is to provide a piezoelectric ceramic composition having a large piezoelectric constant that is particularly useful as a material for a piezoelectric actuator.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the piezoelectric ceramic composition of the present invention has a general formula: aPbTiO 3 —bPbZrO 3 —cPb (Mg 1/3 Nb 2/3 ) O 3 —dPb (Ni 1/3 Nb 2/3 ) In the porcelain composition represented by O 3 , 34 ≦ a ≦ 40, 17 ≦ b ≦ 23, 15 ≦ c ≦ 28, 15 ≦ d ≦ 28 (where a, b, c and d are mol%, a + b + c + d = 100).
[0009]
Here, the reason why the composition range is limited to the above is as follows.
That is, when the PbTiO 3 amount a is less than 34 mol%, the Curie temperature decreases and the piezoelectric constant decreases, which is not preferable. On the other hand, when the amount a of PbTiO 3 exceeds 40 mol%, the piezoelectric constant becomes small, which is not preferable.
[0010]
On the other hand, when the PbZrO 3 content b is less than 17 mol%, the piezoelectric constant becomes small, which is not preferable. On the other hand, when the amount b of PbZrO 3 exceeds 23 mol%, the Curie temperature is lowered and the piezoelectric constant is decreased, which is not preferable.
[0011]
On the other hand, if the amount c of Pb (Mg 1/3 Nb 2/3 ) O 3 is less than 15 mol% or exceeds 28 mol%, the piezoelectric constant is decreased, which is not preferable.
[0012]
Furthermore, when the amount d of Pb (Ni 1/3 Nb 2/3 ) O 3 is less than 15 mol%, the piezoelectric constant becomes small, which is not preferable. On the other hand, if the amount d of Pb (Ni 1/3 Nb 2/3 ) O 3 exceeds 28 mol%, the Curie temperature is lowered and the piezoelectric constant is decreased, which is not preferable.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the piezoelectric ceramic composition of the present invention will be described based on examples.
[0014]
First, powders of PbO, ZrO 2 , TiO 2 , Nb 2 O 5 , NiO, and Mg (OH) 2 were prepared as starting materials. Thereafter, these powders were weighed so that porcelains having the compositions shown in Table 1 were obtained, water was added and wet-mixed with a ball mill, and then calcined at 900 ° C. for 2 hours.
[0015]
[Table 1]
Thereafter, the obtained calcined product was wet pulverized with a ball mill, and then added with a binder and granulated. The granulated powder was molded into 34 mm × 24 mm × 1.1 mm (thickness) at a pressure of 1.5 ton / cm 2 and then fired at 1240 ° C. for 2 hours to obtain a square plate-like ceramic. Thereafter, both sides of the square plate-like porcelain were lapped to a thickness of 0.6 mm, and silver electrodes were baked on both sides, and then two sheets were bonded together with an adhesive. Next, this was cut into 30 mm × 3 mm × 1.2 mm (thickness) to obtain an element. Thereafter, the obtained element was subjected to polarization treatment by applying an electric field of 3 kV / mm in silicon oil at 80 ° C.
[0017]
Next, the dielectric constant (ε 33 ), electromechanical coupling coefficient (Kp), and piezoelectric constant (d 31 ) of the element obtained as described above were obtained. The dielectric constant (ε 33 ) was calculated by measuring the capacitance. The electromechanical coupling coefficient (Kp) was calculated by measuring the resonance and antiresonance frequencies with an impedance measuring instrument. The piezoelectric constant (d 31 ) was calculated by measuring the amount of displacement when a large electric field of 2 kV / mm was applied to drive the unimorph.
[0018]
The results are shown in Table 2. In Table 2, those marked with * are outside the scope of the present invention, and all others are within the scope of the present invention.
[0019]
[Table 2]
As shown in Table 2, those within the range of the present invention are particularly excellent in the piezoelectric constant (d 31 ) as compared with those outside the range of the present invention shown in Sample Nos. 13, 14, and 15.
[0021]
【The invention's effect】
As apparent from the above description, in accordance with the present invention, PbTiO 3 -PbZrO 3 -Pb (Mg 1/3 Nb 2/3) O 3 -Pb (Ni 1/3 Nb 2/3) O 3 system By limiting the ratio of each component to a specific range, a piezoelectric ceramic composition having a large piezoelectric constant useful as an actuator material can be obtained.
Claims (1)
３４≦ａ≦４０
１７≦ｂ≦２３
１５≦ｃ≦２８
１５≦ｄ≦２８
（但し、ａ、ｂ、ｃ及びｄはモル％、ａ＋ｂ＋ｃ＋ｄ＝１００）であることを特徴とする、圧電体磁器組成物。In the formula, aPbTiO 3 -bPbZrO 3 -cPb (Mg 1/3 Nb 2/3) O 3 -dPb (Ni 1/3 Nb 2/3) porcelain composition represented by O 3,
34 ≦ a ≦ 40
17 ≦ b ≦ 23
15 ≦ c ≦ 28
15 ≦ d ≦ 28
(However, a, b, c, and d are mol%, a + b + c + d = 100) The piezoelectric ceramic composition characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16159296A JP3867320B2 (en) | 1996-06-21 | 1996-06-21 | Piezoelectric ceramic composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16159296A JP3867320B2 (en) | 1996-06-21 | 1996-06-21 | Piezoelectric ceramic composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH107461A JPH107461A (en) | 1998-01-13 |
| JP3867320B2 true JP3867320B2 (en) | 2007-01-10 |
Family
ID=15738075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16159296A Expired - Fee Related JP3867320B2 (en) | 1996-06-21 | 1996-06-21 | Piezoelectric ceramic composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3867320B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7067965B2 (en) | 2002-09-18 | 2006-06-27 | Tdk Corporation | Piezoelectric porcelain composition, piezoelectric device, and methods of making thereof |
| US8470211B2 (en) * | 2006-04-13 | 2013-06-25 | Agency For Science, Technology And Research | Ferroelectric ceramic material with a low sintering temperature |
-
1996
- 1996-06-21 JP JP16159296A patent/JP3867320B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH107461A (en) | 1998-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6426018B1 (en) | Piezoelectric ceramic compositions | |
| JP4513948B2 (en) | Piezoelectric ceramic and manufacturing method thereof | |
| JP3244027B2 (en) | Piezoelectric ceramic composition | |
| JP3341672B2 (en) | Method for manufacturing piezoelectric ceramic element | |
| JP3198906B2 (en) | Piezoelectric porcelain composition | |
| JPH06191941A (en) | Piezoelectric material | |
| JP3385999B2 (en) | Piezoelectric ceramic composition, piezoelectric buzzer and piezoelectric actuator using the same | |
| JP3867320B2 (en) | Piezoelectric ceramic composition | |
| JP2004168603A (en) | Piezoelectric ceramic composition | |
| JP4569062B2 (en) | Piezoelectric ceramic | |
| JPH0788252B2 (en) | Oxide piezoelectric material | |
| JP4432280B2 (en) | Piezoelectric ceramic | |
| JP4001366B2 (en) | Piezoelectric ceramic | |
| JP2820000B2 (en) | Piezoelectric material composition for actuator | |
| JPH0558729A (en) | Piezoelectric ceramic composition | |
| WO1991004586A1 (en) | Piezoelectric ceramic composition for actuator | |
| JPH08217541A (en) | Piezoelectric ceramic composition | |
| JP3771776B2 (en) | Piezoelectric ceramic composition | |
| JPH0687652A (en) | Piezoelectric material | |
| JP3117625B2 (en) | Electric field induced strain material | |
| JP4009417B2 (en) | Piezoelectric and piezoelectric devices | |
| JP3554395B2 (en) | Piezoelectric material | |
| JP3214626B2 (en) | Piezoelectric ceramic composition | |
| JPH0629140B2 (en) | Piezoelectric element material and manufacturing method thereof | |
| JP3554397B2 (en) | Piezoelectric material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050916 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20051025 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20060919 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20061002 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101020 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20101020 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20111020 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20121020 Year of fee payment: 6 |
|
| LAPS | Cancellation because of no payment of annual fees |