This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of lithium niobate single crystals. This standard applies to lithium niobate single crystal rods grown by the Czochralski method. The product is used to make surface acoustic wave device substrates, etc. GB/T 14843-1993 Lithium niobate single crystal GB/T14843-1993 Standard download decompression password: www.bzxz.net

UDC 669.293:669.884-172
National Standard of the People's Republic of China
GB/T 14843--93
Lithium niobate single crystals
Lithium niobate single crystals1993-12-24Promulgated
State Administration of Technical Supervision
1994-09-01Implementation
National Standard of the People's Republic of China
Lithiuml niobate single crystals1Subject content and scope of application
GB/T 14843—93
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of lithium niobate single crystals. This standard applies to lithium niobate single product rods grown by the Czochralski method. The product is used to make surface acoustic wave device substrates, etc. 2 Reference Standards
GB/T15250 Test Method for Bulk Acoustic Wave Attenuation of Lithium Piezoelectric Acid Single Product 3 Terminology
3.1 Adjacent Diameter Sudden Change
The percentage of the difference between the peak value of the diameter of a single crystal and its adjacent diameter valley value to the average value of the two. 3.2 Taper
The percentage of the difference between the diameters at both ends of a single crystal and its length. 3.3 Curvature
The maximum distance between the curved part of a single crystal and its baseline. 3.4 Axial Deviation
The angular deviation between the geometric axis of a single product and the required axis. 3.5 Supercooling Ring
An opaque layer with a certain depth and in a ring shape around the surface of a single crystal. 4 Product Classification
Lithium Piezoelectric Acid Single Crystals are divided into single crystals with growth directions such as (11.0], [01.07t.00.1), and C10.4. 4.2 Lithium bismuth oxide single crystals are classified into different models according to their application, diameter and growth direction. The model designation is as follows: IN
(1)(2) (3) (4)
Use \LN" to represent lithium bismuth oxide single crystals.
Use capital letter Y to represent piezoelectric applications. Use Arabic numerals to represent the diameter of the single crystal, mm. Use crystallographic symbols to represent the growth direction of the single crystal. 4.3 The specifications of lithium bismuth oxide single crystals shall comply with the requirements of Table 1. Approved by the State Administration of Technology on December 24, 1993 and implemented on September 1, 1994
[10.4J127.86Y
5 Technical requirements
CB/T 1484393
Diameter, mm
40-110
4h~110
40~-110
40~110
5.1 The single crystal is colorless, pale yellow or pale green, with good transparency, no cracks and supercooling rings. 5.2 There are no clouds, bubbles and scattered particles inside the single crystal. 5.3 The single crystal phase diameter sinus variation and taper are not greater than 5%. 5.4 The curvature of the single crystal is not greater than 2mm.
5.5 The axial deviation of the single crystal is not greater than 5°.
5.6 The allowable deviation of the single crystal diameter is ±2mm.
5.7 The orientation deviation caused by internal defects of the single crystal is not Greater than 15'. 5.8 The single crystal should be completely monodomainized.
Length.mm, not less than
The elasticity, piezoelectricity, dielectric constant, electromechanical coupling coefficient and surface acoustic wave performance indicators of lithium niobate single crystal can be referred to Appendix A. If the purchaser has special requirements, the supply and demand parties shall negotiate separately. 6
Test method
The macroscopic quality of lithium niobate single crystal is visually inspected. The scattered particles in the lithium niobate single crystal are visually inspected under the irradiation of a flashlight or laser beam. 6.3
The size of lithium niobate single products is measured with measuring tools of corresponding accuracy. 6.4 The axial deviation of the single crystal is measured with an X-ray orientation instrument. The axial deviation Φ is calculated according to the following formula: tgg=(tg\a+ tg\p)
Where: ——Axial deviation angle t
-Horizontal component of axial deviation angle:
βVertical component of axial deviation angle.
6.5 The single domain test of lithium ion battery single crystal shall be carried out in accordance with Appendix B (Supplement). 6.6 The elasticity, piezoelectricity, dielectric constant and electromechanical coupling coefficient of lithium ion battery single crystal shall be determined in accordance with the method agreed by both the supplier and the buyer. 6.7 The surface acoustic wave performance parameters of lithium ion battery single crystal shall be determined in accordance with GB/T 15250. 7 Inspection rules
7.1 The lithium ion oxide single crystal shall be inspected by the supplier's technical supervision department to ensure that the product complies with the provisions of this standard and fill in the quality certificate. 7.2 The buyer may inspect the received product. If the inspection result is inconsistent with the provisions of this standard, it shall be reported to the supplier within half a year from the date of receipt of the product, and the supplier and buyer shall negotiate to resolve it.
7.3 Sampling method shall be as follows
7.3.1 The size, macroscopic quality, scattering particles and single domain effect of lithium ion oxide single crystal shall be inspected one by one. 7.3.2 The elasticity, piezoelectricity, dielectric constant, electromechanical coupling coefficient and surface acoustic wave performance parameters of lithium ion oxide single crystal shall be inspected at random. 8 Marking, packaging, transportation and storage
8.1 The packaging of lithium ion oxide single crystal shall ensure that the single crystal is not damaged. 2
Each single crystal shall be accompanied by a quality certificate, indicating: 6.2
supplier name;
product number
product model and specification,
product dead weight,
various test results and test department stamp: this standard number:
test date.
GB/T 14843-93
Each packing box shall indicate: supplier name, product name and code, and "moisture-proof" and "handle with care" words or signs. Lithium niobate single crystals shall be protected from moisture and severe vibration during transportation. Lithium niobate single crystals shall be stored in a dry and ventilated place. GB/T14B43—93
Appendix A
Electroelastic constants and surface acoustic wave performance indicators of lithium niobate single crystal
(reference)
A1 The elasticity, piezoelectricity, dielectric constant and electromechanical coupling coefficient indicators of lithium niobate single crystal at different temperatures can be referred to Table A1. Table Al | 50-~0. 60
0. 72~-0. 80
0. 08 ~~0. 09
2. 40 ~2. 50
0.60~0.65
0. 75--0. B(H
5. 50~-5.90
-1.00~-1.10
- 1. 30~ -1. 50
0. 90 1. 05
4.80~5.10
16.0~~21.0
13. 0--14- 0
2. 10--2. 20
0.34~0.52
0.60~0.90
0.10.0.20
2.48~2.60
0. 90 ~ 1. 00
5.03~5.57
-- 0. 44~-.- 0. 66
1. 12 ~-1. 68
0.72~~1.08
4. 505. 00
Self-exiting mediumwww.bzxz.net
Isolation rate
Clamping medium
Isolation rate
eli/eo
GB/T14843—93
Continued Table A1
10-HC/N
10-m*/C
10°m/F
10°m/F
The surface acoustic wave performance indicators of lithium titanate single crystal under temperature can be referred to Table A2. Qiu A2||t t||Cutting direction
Transmission direction
Surface acoustic wave velocity
Surface acoustic wave electromechanical combination coefficient
Surface acoustic wave delay time temperature coefficient
Surface acoustic wave velocity temperature coefficient
Surface acoustic wave velocity
Surface acoustic wave electromechanical combination coefficient
Surface acoustic wave delay time temperature coefficient
Surface acoustic wave velocity temperature coefficient
Chiang Muguo
Technical indicators
9. 90~12- 10
10.50~12.90
27. 0~29. 5
84.0~-85. 0
28--30
2. 4 ~- 2. 6
9. 14~0. 25
1.30~1.40
6. 50~7.80
1. 7-2.1
0. 08- -~ 0. 13
0. 55 ~0. 65
8.10~9.90
2. 40-~3. 00|| tt||- 0. 27~ - 0, 63
2. 00 ~ 2. 50
8.20~~10.10
5. 40~6. 60
0. 56~1. 04
5.006. 00
1.32~~ 1. 3B
3. 72~ 4. 04
2. 42~2. 8
3. 80-~-4. 30
Technical index
3470/3510
B4 ~ 90
3950/3990
5-4 ~ 6. 0
- 57~-61
B1 Principle
GB/T 14843—93
Appendix B
Detection method of single crystal phosphating of lithium saw oxide
( Supplementary material:
The multi-domain crystal is transformed into a single-domain crystal through single-domain treatment, with one end being a positive domain and the other end being a negative domain. The characteristics of the positive domain being slow to etch and the negative domain being fast to etch are shown. The domain structure diagrams are different. B2 reagents
B2.1 Acid (FINC),): 65%~68%
B2.2 Hydrofluoric acid (HF). 40%
B2.3 Corrosive solution :HNO,:HF=2:1 (volume ratio), B3 Equipment and instruments
Inner bacteria cutting machine,
B3.2 Metallographic microscope;
B3.3 Water bath ,
B3.4 platinum crucible;
B3.5 electricity: 1 kw.
"Acid-resistant plastic container and plastic basket.
BA specimen||tt| | B4.7 Cut 1mm thick wafers from both ends of the contact electrodes of the head and tail of the product after single domain treatment and discard them: B4.2 Cut a 2.0mm thick (00.1) or (10.4) wafer from each end: B4 . 3. Grind with 100 grit abrasive and then fine grind with 280 grit abrasive until it is uniformly frosted glass without any spots or mechanical scratches under a metallographic microscope.
B5 Inspection steps
B5 .1 Corrosion
B5. 1.1 Water bath hot corrosion method
Put the sample in a plastic basket, and then put the plastic basket in a plastic container containing the corrosive solution until the sample is immersed. Cover Seal. Then cover the plastic container in a water bath and heat it on an electric stove. Keep it for 40 minutes after the water boils. B5.1.2 Glycol hot corrosion method
Put the sample in platinum glycerine and inject the corrosion solution until the sample Immerse the sample, heat and boil on an electric stove for 5 minutes. B5.2 Cleaning
Thoroughly clean the corrosive liquid adsorbed on the sample with clean water and wipe it dry with lens cleaning paper. B6 Result judgment
B6.1 Water bath hot corrosion method The sample is observed under a metallographic microscope with a magnification of 400 Cr. The negative domain surface corrosion pattern shown in Figure B1 or Figure B2 is qualified
Figure B (0 Negative domain surface
GB/T14843-93
Figure B2 (104) Negative domain surface
B6.2 Crucible hot corrosion method sample under a metallographic microscope with a magnification of 400 times Observe under the condition that the corrosion pattern of the negative domain surface is as shown in Figure B3 or Figure B4, which is qualified.
Figure B3 ((01) Negative domain surface
( 104) Negative domain surface
B6.3 The samples obtained by water bath hot corrosion method and hot corrosion method were observed under a metallographic microscope with a magnification of 400 times. The corrosion pattern of the positive domain surface is shown in Figure B5.
Figure B5
Stop
Additional instructions:
GB/T14843—93
This standard is proposed by China Nonferrous Metals Industry Corporation. The standard was drafted by the 26th Institute of the Mechanical and Electronic Industry Department of Ningxia Nonferrous Metal Smelter. The main drafters of this standard are Liu Enfu, Shen Jixue, Chen Shufen, and Zhang Jingfang.
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