CN1537826A - Method of preparing leadless calcium titanium ore structure ferroelectric film possessing high orientation - Google Patents
Method of preparing leadless calcium titanium ore structure ferroelectric film possessing high orientation Download PDFInfo
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- CN1537826A CN1537826A CNA2003101081281A CN200310108128A CN1537826A CN 1537826 A CN1537826 A CN 1537826A CN A2003101081281 A CNA2003101081281 A CN A2003101081281A CN 200310108128 A CN200310108128 A CN 200310108128A CN 1537826 A CN1537826 A CN 1537826A
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Abstract
A process for preparing high orientated ferroelectric film with non-lead perovskite structure features use of sol-gel method, in which the concentration of the precursor solution is restrictly controlled to be 0.01-0.1 M and its substrate is LaNiO3/Pt/Ti/SiO2/Si.
Description
Technical field
The invention belongs to electronic material and device technology field, being specially a kind of non-lead that adopts the chemical process preparation to have height-oriented structure is the method for perovskite structure ferroelectric membranc.
Prior art
The processing method that adopts sol-gel process to prepare ferroelectric membranc has many reports, especially in the ferroelectric membranc of lead system.In recent years, because to going deep into that non-lead ferro-electric film is studied, its preparation method is also more and more paid close attention to by people.And sol-gel process with its stoichiometric ratio precise control, film forming area big and evenly, advantage such as the technological process temperature is low, equipment is simple and being adopted by people.Generally speaking, the precursor solution range of concentrations of employing is between 0.3-0.5M, and employed substrate is generally Pt/Ti/SiO
2/ Si, such film that obtains is generally the polycrystal film that does not have preferred orientation.Compare with polycrystal film, have height-oriented ferroelectric membranc and have characteristics such as higher saturated polarization, easily polarization, pyroelectric coefficient height.Therefore, preparing the ferroelectric membranc with height-oriented structure on silicon substrate is that people expect.
Generally speaking, adopt the ferroelectric membranc of chemical vapour deposition (MOCVD), the preparation of laser flash distillation methods such as (PLD) to have orientation and higher density preferably.Its major cause is in the depositing of thin film process, be with molecular layer or atomic shell continuously one deck connect the deposition of one deck, thereby form film than the growth pattern that prolongs beyond being easier to.Adopt the main difficulty of MOCVD method to be: the chemical vapour deposition source is difficult to obtain; The stoichiometric ratio of thin-film material is difficult to accurate control; Apparatus expensive.Adopt the PLD method then mainly to be: that is with the big area film forming; Owing to be film forming under lower oxygen partial pressure, its oxygen defect is difficult to eliminate, and influences the performance of film.Adopt sol-gel process to prepare ferroelectric membranc and then can remedy above deficiency, but the precursor solution range of concentrations that adopts between 0.3-0.5M, be difficult to obtain height-oriented ferroelectric membranc.
Summary of the invention
It is the method for perovskite structure ferroelectric membranc that purpose of the present invention just provides a kind of non-lead that adopts the chemical process preparation to have height-oriented structure.
The non-lead that the preparation that the present invention proposes has height-oriented structure is the method for perovskite structure ferroelectric membranc, is a kind of chemical preparation process, i.e. sol-gel method, and its substrate adopts LaNiO
3/ Pt/Ti/SiO
2/ Si, the concentration of precursor solution is controlled between the 0.01M-0.1M, and can obtain to have (100) height-oriented non-lead is the perovskite structure ferroelectric membranc.
Among the present invention, adopt different precursor solutions, can obtain the ferroelectric membranc of different systems.For example, adopt barium acetate, zirconium iso-propoxide and titanium isopropylate and corresponding solvent, can make zirconium barium titanate (BZT) system; Adopt barium acetate, strontium acetate and titanium isopropylate and coordinative solvent, can make strontium-barium titanate (BST) system; Adopt barium acetate, tin acetate and titanium isopropylate and coordinative solvent, can make titanium barium stannate (BTS) system.The ferroelectric membranc of these systems all has height (100) orientation.
Description of drawings
Fig. 1, Fig. 2 and Fig. 3 adopt sol-gel process at LaNiO respectively
3/ Pt/Ti/SiO
2The X-ray diffractogram of the zirconium barium titanate for preparing on/Si the substrate (BZT), strontium-barium titanate (BST) and titanium barium stannate (BTS) ferroelectric membranc.
Embodiment
(BZT) is to zirconium barium titanate:
In the synthetic preparation of following ratio Ba (Zr
xTi
1-x) O
3The precursor solution of film (0≤x≤1), the chemical feedstocks that is adopted is barium acetate [Ba (CH
3COO)
2], zirconium iso-propoxide [Zr (OC
3H
7)
4], and titanium isopropylate [Ti (OC
3H
7)
4], solvent is Glacial acetic acid and ethylene glycol ethyl ethers mystery.Earlier barium acetate is heated to boiling in glacial acetic acid solution, stops heating after 5 minutes, and be cooled to room temperature (Ba: Glacial acetic acid=1: 5-10mol).Mixing solutions with zirconium iso-propoxide, titanium isopropylate, ethylene glycol ethyl ethers mystery and methyl ethyl diketone (AcAc) joins in the glacial acetic acid solution of baric again, wherein: (Zr+Ti): AcAc=1: 1-3mol, (zirconium iso-propoxide+titanium isopropylate): ethylene glycol ethyl ethers mystery=1: 5-10mol.At last the concentration of solution is adjusted to 0.05M, place and be used for preparing film after 24 hours.
Employed substrate is LaNiO
3/ Pt/Ti/SiO
2/ Si (100), LaNiO
3, Pt, Ti, SiO
2With the thickness of Si sheet be respectively 150nm, 150nm, 50nm, 150nm and 3500nm.
The method that adopts rotation to apply prepares film, and speed of rotation is 3000 rev/mins, 30 seconds time.Gel-film is directly put into 500 ℃ tube furnace, was placed 5 minutes, takes out postcooling to room temperature, applies one deck gel-film down, move in circles up to the film that obtains desired thickness, at last with this film 650 ℃ of-750 ℃ of following thermal treatments 30 minutes.The X-ray diffractogram of this ferroelectric membranc is seen shown in Figure 1.
In the aforesaid method, the concentration of precursor solution is got 0.01M, 0.1M, and the ferroelectric membranc of gained has similar result shown in Figure 1.
(BST) is to strontium-barium titanate:
In the synthetic preparation of following ratio (Sr
xBa
1-x) TiO
3The precursor solution of film (0≤x≤1), the chemical feedstocks that is adopted is barium acetate [Ba (CH
3COO)
2], strontium acetate [Sr (CH
3COO)
2], and titanium isopropylate [Ti (OC
3H
7)
4], solvent is Glacial acetic acid and ethylene glycol ethyl ethers mystery.Earlier barium acetate and strontium acetate are heated to boiling according to a certain percentage in glacial acetic acid solution, stop heating after 5 minutes, and be cooled to room temperature ((Ba+Sr): Glacial acetic acid=1: 5-10mol).Mixing solutions with titanium isopropylate, ethylene glycol ethyl ethers mystery and methyl ethyl diketone (AcAc) joins in the glacial acetic acid solution of baric and strontium, wherein again: Ti: AcAc=1: 1-3mol, titanium isopropylate: ethylene glycol ethyl ethers mystery=1: 5-10mol.At last the concentration of solution is adjusted to 0.1M, place and be used for preparing film after 24 hours.
Employed substrate is LaNiO
3/ Pt/Ti/SiO
2/ Si (100), LaNiO
3, Pt, Ti, SiO
2With the thickness of Si sheet be respectively 150nm, 150nm, 50nm, 150nm and 3500nm.
The method that adopts rotation to apply prepares film, and speed of rotation is 3000 rev/mins, 30 seconds time.Gel-film is directly put into 500 ℃ tube furnace, was placed 5 minutes, takes out postcooling to room temperature, applies one deck gel-film down, moves in circles up to the film that obtains desired thickness.At last with this film 650 ℃ of-750 ℃ of following thermal treatments 30 minutes.The X-ray diffraction of this ferroelectric membranc is seen shown in Figure 2.
In the aforesaid method, precursor solution is got 0.05M, 0.01M etc., and the ferroelectric membranc of gained has similar result shown in Figure 2.
(BTS) is to the titanium barium stannate:
In the synthetic preparation of following ratio Ba (Sn
xTi
1-x) O
3The precursor solution of film (0≤x≤1), the chemical feedstocks that is adopted is barium acetate [Ba (CH
3COO)
2], tin acetate [Sn (CH
3COO)
4] and titanium isopropylate [Ti (OC
3H
7)
4], solvent is Glacial acetic acid and ethylene glycol ethyl ethers mystery.Earlier barium acetate and tin acetate are heated to boiling according to a certain percentage in glacial acetic acid solution, stop heating after 30 minutes, and be cooled to room temperature ((Ba+Sn): Glacial acetic acid=1: 5-10mol).Mixing solutions with titanium isopropylate, ethylene glycol ethyl ethers mystery and methyl ethyl diketone (AcAc) joins in the glacial acetic acid solution of baric and tin, wherein again: Ti: AcAc=1: 1-3mol, titanium isopropylate: ethylene glycol ethyl ethers mystery=1: 5-10mol.At last the concentration of solution is adjusted 0.1M, place and be used for preparing film after 24 hours.
Employed substrate is LaNiO
3/ Pt/Ti/SiO
2/ Si (100), LaNiO
3, Pt, Ti, SiO
2With the thickness of Si sheet be respectively 150nm, 150nm, 50nm, 150nm and 3500nm.
The method that adopts rotation to apply prepares film, and speed of rotation is 3000 rev/mins, 30 seconds time.Gel-film is directly put into 500 ℃ tube furnace, was placed 5 minutes, takes out postcooling to room temperature, applies one deck gel-film down, moves in circles up to the film that obtains desired thickness.At last with this film 650 ℃ of-750 ℃ of following thermal treatments 30 minutes.The X-ray diffractogram of this ferroelectric membranc is seen shown in Figure 3.
In the aforesaid method, the concentration of precursor solution is gathered 0.05M, 0.01M etc., and the gained ferroelectric membranc has and is similar to result shown in Figure 3.
Embodiment 1
As Fig. 1 is to adopt the prepared zirconium barium titanate (BaZr of 0.05M precursor solution concentration
0.36Ti
0.64O
3) X-ray diffractogram of film.The heat-treat condition of film is at 700 ℃, 30 minutes.As seen from the figure, the film that is obtained when the concentration of solution is 0.05M has the preferred orientation of (100).
Embodiment 2:
As Fig. 2 is to adopt the prepared strontium-barium titanate (Ba of 0.1M precursor solution concentration
0.80Sr
0.20TiO
3) X-ray diffractogram of film.The heat-treat condition of film is at 700 ℃, 30 minutes.As seen from the figure, the film that is obtained when the concentration of solution is 0.1M has the preferred orientation of (100).* number is the diffraction peak of substrate among the figure.
Embodiment 3:
As Fig. 3 is to adopt the prepared strontium-barium titanate (BaSn of 0.1M precursor solution concentration
0.15Ti
0.85O
3) X-ray diffractogram of film.The heat-treat condition of film is at 700 ℃, 30 minutes.As seen from the figure, the film that is obtained when the concentration of solution is 0.1M has the preferred orientation of (100).
Claims (4)
1, to have height-oriented non-lead be the method for perovskite structure ferroelectric membranc in a kind of preparation, is a kind of sol-gel method, it is characterized in that substrate adopts LaNiO
3/ Pt/Ti/SiO
2/ Si; The concentration of precursor solution is controlled between the 0.01M-0.1M.
2, preparation method according to claim 1 is characterized in that persursor material adopts barium acetate, zirconium iso-propoxide and different pure titanium and coordinative solvent, obtains the zirconium barium titanate system.
3, preparation method according to claim 1 is characterized in that persursor material adopts barium acetate, strontium acetate and titanium isopropylate and coordinative solvent, obtains the strontium-barium titanate system.
4, preparation method according to claim 1 is characterized in that persursor material adopts barium acetate, tin acetate and titanium isopropylate and coordinative solvent, obtains titanium barium stannate system.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336773C (en) * | 2004-12-15 | 2007-09-12 | 同济大学 | Ferroelectric membrane with constituents graded distribution and its preparation method |
| CN100369864C (en) * | 2006-05-23 | 2008-02-20 | 湖北大学 | Optimized-oriented-growth preparing method for BndT ferro-electric film |
| CN100376506C (en) * | 2005-06-16 | 2008-03-26 | 同济大学 | Non-plumbum series ferroelectric film with ingredient gradient distribution and its preparation method |
| CN100444975C (en) * | 2004-12-24 | 2008-12-24 | 淮北煤炭师范学院 | Method for preparing thin-film material of Sr (Ba, Ca) Fe, Mo, O in structure of double perovskite |
| CN100456420C (en) * | 2007-05-17 | 2009-01-28 | 上海交通大学 | Manufacture method of (110) orientation ferroelectric thin film on Si baseplate |
| CN100457292C (en) * | 2005-11-29 | 2009-02-04 | 同济大学 | (Ba,Zr)TiO3 ferroelectric film with optimized performance and its preparing method |
| CN100586582C (en) * | 2005-10-13 | 2010-02-03 | 同济大学 | Method for preparing barium stan-titanate ferroelectric film |
| CN1967749B (en) * | 2005-11-18 | 2010-05-12 | 同济大学 | A low temperature preparing method of non lead ferroelectric film |
| CN101074491B (en) * | 2007-03-29 | 2011-05-04 | 上海大学 | Method for growing barium strontium titanate on metal titanium-based substrate |
| CN101376591B (en) * | 2007-08-30 | 2012-08-22 | 中国科学院福建物质结构研究所 | Novel barium stannate-lead ferroelectric and piezoelectic ceramic, and preparation thereof |
| CN101789260B (en) * | 2010-01-19 | 2013-03-20 | 湘潭大学 | Epitaxial strain ferroelectric film for ferroelectric memory and method for regulating and controlling strain thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS605947A (en) * | 1983-06-20 | 1985-01-12 | 株式会社竹中工務店 | Floor structure of construction |
| CN1092169C (en) * | 2000-02-16 | 2002-10-09 | 中国科学院上海硅酸盐研究所 | Simple and effective preparation method of lead zirconate titanate film |
-
2003
- 2003-10-23 CN CNB2003101081281A patent/CN100348541C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336773C (en) * | 2004-12-15 | 2007-09-12 | 同济大学 | Ferroelectric membrane with constituents graded distribution and its preparation method |
| CN100444975C (en) * | 2004-12-24 | 2008-12-24 | 淮北煤炭师范学院 | Method for preparing thin-film material of Sr (Ba, Ca) Fe, Mo, O in structure of double perovskite |
| CN100376506C (en) * | 2005-06-16 | 2008-03-26 | 同济大学 | Non-plumbum series ferroelectric film with ingredient gradient distribution and its preparation method |
| CN100586582C (en) * | 2005-10-13 | 2010-02-03 | 同济大学 | Method for preparing barium stan-titanate ferroelectric film |
| CN1967749B (en) * | 2005-11-18 | 2010-05-12 | 同济大学 | A low temperature preparing method of non lead ferroelectric film |
| CN100457292C (en) * | 2005-11-29 | 2009-02-04 | 同济大学 | (Ba,Zr)TiO3 ferroelectric film with optimized performance and its preparing method |
| CN100369864C (en) * | 2006-05-23 | 2008-02-20 | 湖北大学 | Optimized-oriented-growth preparing method for BndT ferro-electric film |
| CN101074491B (en) * | 2007-03-29 | 2011-05-04 | 上海大学 | Method for growing barium strontium titanate on metal titanium-based substrate |
| CN100456420C (en) * | 2007-05-17 | 2009-01-28 | 上海交通大学 | Manufacture method of (110) orientation ferroelectric thin film on Si baseplate |
| CN101376591B (en) * | 2007-08-30 | 2012-08-22 | 中国科学院福建物质结构研究所 | Novel barium stannate-lead ferroelectric and piezoelectic ceramic, and preparation thereof |
| CN101789260B (en) * | 2010-01-19 | 2013-03-20 | 湘潭大学 | Epitaxial strain ferroelectric film for ferroelectric memory and method for regulating and controlling strain thereof |
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