GB1243994A - Compound crystal - Google Patents
Compound crystalInfo
- Publication number
- GB1243994A GB1243994A GB2380/71A GB238071A GB1243994A GB 1243994 A GB1243994 A GB 1243994A GB 2380/71 A GB2380/71 A GB 2380/71A GB 238071 A GB238071 A GB 238071A GB 1243994 A GB1243994 A GB 1243994A
- Authority
- GB
- United Kingdom
- Prior art keywords
- crystal
- platinum
- gmo
- pelleted
- heated
- 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
Links
- 239000013078 crystal Substances 0.000 title abstract 7
- 150000001875 compounds Chemical class 0.000 title abstract 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 abstract 5
- 229910052697 platinum Inorganic materials 0.000 abstract 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 abstract 1
- 229910052688 Gadolinium Inorganic materials 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 abstract 1
- 239000000155 melt Substances 0.000 abstract 1
- MEFBJEMVZONFCJ-UHFFFAOYSA-N molybdate Chemical compound [O-][Mo]([O-])(=O)=O MEFBJEMVZONFCJ-UHFFFAOYSA-N 0.000 abstract 1
- 239000000843 powder Substances 0.000 abstract 1
- 229910052761 rare earth metal Inorganic materials 0.000 abstract 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 abstract 1
- 150000002910 rare earth metals Chemical class 0.000 abstract 1
- 239000000126 substance Substances 0.000 abstract 1
- 230000007704 transition Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/04—Gramophone pick-ups using a stylus; Recorders using a stylus
- H04R17/08—Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
- H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
- H01G7/025—Electrets, i.e. having a permanently-polarised dielectric having an inorganic dielectric
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
- H04R17/04—Gramophone pick-ups using a stylus; Recorders using a stylus
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
1,243,994. Rare earth oxide. HITACHI Ltd. 26 July, 1968 [2 Aug., 1967; 18 Sept., 1967], No. 2380/71. Divided out of 1,243,993. Heading C1A. [Also in Division H1] Relates to compound crystalline substances of general formula where R and R<SP>1</SP> are at least one kind of rare earth, x is 0 to 1À0 and e is 0 to 0À2, gadolinium molybdate (GMO) being the chief example. The Specification lists 48 other examples. To make Gd 2 (MoO 4 ) 3 , the appropriate oxides are mixed, pelleted and heated in a platinum or alumina crucible at 700 C. for a few hours. The sample is then cooled, powdered, stirred, pelleted and re-heated for two to four hours at 1000 C. An electric furnace is used. To form a single crystal, the GMO powder is fused in a platinum crucible at about 1190 C. and a crystal pulled from the melt using a platinum wire of 1 mm. diameter revolving at 30-60 r.p.m. and raised at a rate of 1À5 to 18 mm./hr. A crystal of about 1 mm. diameter is obtained and this may be used as a seed for a larger crystal using the same method. The crystals are annealed to prevent formation of cracks. They belong to the rhombic mm 2 point group at temperatures below the phase transition temperature (Curie point) and exhibit ferroelectric/elastic properties at these temperatures, the a and b axes of the crystal being unequal.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP42049674A JPS4943831B1 (en) | 1967-08-02 | 1967-08-02 | |
| JP42059450A JPS492479B1 (en) | 1967-09-18 | 1967-09-18 | |
| GB35906/68A GB1243993A (en) | 1967-08-02 | 1968-07-26 | A mechano-electrical coupling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1243994A true GB1243994A (en) | 1971-08-25 |
Family
ID=27259318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2380/71A Expired GB1243994A (en) | 1967-08-02 | 1968-07-26 | Compound crystal |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1243994A (en) |
-
1968
- 1968-07-26 GB GB2380/71A patent/GB1243994A/en not_active Expired
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