US4339543A
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Temperature-stable dielectric material for use at very high frequency and a method of manufacture of said material
Assignee: Thales SA
•
Filing: 1981-02-25
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Granted: 1982-07-13
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Expires: 2001-02-25
Abstract
Abstract A dielectric material having a high dielectric constant, very low high-frequency losses and very high temperature stability is prepared in particular by sintering previously ground raw materials in an oxidizing atmosphere at 1450° C. The molar composition of the raw materials is as follows: t, TiO 2 ; x, SnO 2 ; y, ZrO 2 ; a, NiO; b, La 2 O 3 ; where t is between 0.9 and 1.1, x is between 0.1 and 0.4 moles, y is between 0.6 and 0.9, a is between 0.015 and 0.06 moles, b is between 0.01 and 0.1 moles with an addition of iron of 0.0035 mole in respect of one mole of TiO 2 obtained, for example, from the use of steel equipment for the grinding operation. When x is in the vicinity of 0.35, the coefficient of thermal variation τ f is reduced to zero and the quality criterion Q.f is high.
Inventors
- 👤 Jean-Claude Mage
- 👤 Claude Deljurie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/49; H; H01; H01B; H01B3/00; H01B3/02; H01B3/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
123 words
Dielectric material of the type obtained in accordance with the ceramic production technology, comprising at least one step involving sintering of previously ground raw materials in an oxidizing atmosphere, wherein the relative molar proportions of the raw materials are as follows: t, TiO 2 ; x, SnO 2 ; y, ZrO 2 ; a, NiO; b, La 2 O 3 and c, Fe, in which the parameters t, x, y, a, b and c satisfy the following inequalities: ______________________________________
0.9 ≦ t ≦
1.1
0.1 ≦ x ≦
0.4
0.6 ≦ y ≦
0.9
0.015 ≦ a ≦
0.06
0.01 ≦ b ≦
0.1
0.001 ≦ c ≦
0.01
______________________________________ and Fe is present as Fe 2 O 3 in the end product.
Claim 2
Dependent Claim
123 words
Dielectric material of the type obtained in accordance with the ceramic production technology, comprising at least one step involving sintering of previously ground raw materials in an oxidizing atmosphere, wherein the relative molar proportions of the raw materials are as follows: t, TiO 2 ; x, SnO 2 ; y, ZrO 2 ; a, NiO; b, La 2 O 3 and c, Fe, in which the parameters t, x, y, a, b and c satisfy the following inequalities: ______________________________________
0.9 ≦ t ≦
1.1
0.1 ≦ x ≦
0.4
0.6 ≦ y ≦
0.9
0.015 ≦ a ≦
0.06
0.01 ≦ b ≦
0.1
0.001 ≦ c ≦
0.01
______________________________________ and Fe is present as Fe 2 O 3 in the end product.
Claim 3
Dependent Claim
45 words
Dielectric material according to claim 1, wherein the parameters satisfy the following inequalities: ______________________________________
0.99 ≦ t ≦
1.01
0.30 ≦ x ≦
0.38
0.06 ≦ y ≦
0.70
0.015 ≦ a ≦
0.06
0.01 ≦ b ≦
0.01
0.001 ≦ c ≦
0.01
______________________________________
Claim 4
Dependent Claim
37 words
Dielectric material according to claim 1, wherein the composition of the raw materials in respect of 1.003 mole of TiO 2 is as follows: ______________________________________
0.325 SnO.sub.2
0.642 ZrO.sub.2
0.03 NiO
0.015 La.sub.2 O.sub.3
0.0035 Fe
______________________________________
Claim 5
Dependent Claim
36 words
Dielectric material according to claim 1, wherein the composition of raw materials in respect of 1.001 mole of TiO 2 is as follows: ______________________________________
0.325 SnO.sub.2
0.644 ZrO.sub.2
0.03 NiO
0.015 La.sub.2 O.sub.3
0.0035 Fe
______________________________________
Claim 6
Dependent Claim
44 words
A method of manufacture of dielectric material according to claim 1, wherein said method comprises at least one step which involves grinding of raw materials and one step which involves sintering in an oxidizing atmosphere at a temperature of 1400° C. to 1500° C.
Claim 7
Dependent Claim
21 words
A method of manufacture according to claim 5, wherein iron is introduced during the grinding step by employing steel grinding equipment.
Claim 8
Dependent Claim
31 words
A method of manufacture according to claim 6, wherein the grinding step is carried out by making use of steel balls 3 mm in diameter during a period of twenty minutes.
Claim 9
Dependent Claim
39 words
A method of manufacture according to claim 6, wherein the sintering step is carried out in an atmosphere of pure oxygen during a period of six hours at a temperature within the range of 1400° C. to 1500° C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-12 | 1986-01-11 | 1986-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-12 | 1990-01-11 | 1990-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-12 | 1994-01-11 | 1994-07-13 | $7700.00 | Window Closed / Lapsed |