Patent EP0186145A2 successfully refreshed from Google Patents.
EP0186145A2
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High frequency wave absorbing ceramics
Assignee: Denso Corp
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Filing: 1985-12-19
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Granted: —
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Expires: 2005-12-19
Abstract
Abstract A high frequency wave absorbing ceramics can be used, for example, as an EMI preventive filter for interrupting high frequency waves intruding into electronic circuits. The high frequency wave absorbing ceramics are composed of a ternary composition from 50 to 80 mol% of lead iron niobate Pb(Fe 1/2 Nb 1/2 )O 3 , from 10 to 40 mol % of lead iron tungstate Pb(Fe 2/3 W 1/3 )O 3 and not more than 4 0 mol % of lead iron tantalate Pb(Fe 1/2 Ta 1/2 )O 3 based on the total 100 mol % of a composition composed of lead iron niobate Pb(Fe 1/2 Nb 1/2 )O 3 , lead iron tungstate Pb(Fe 2/3 W 1/3 )O 3 and lead iron tantalate Pb(Fe 1/2 Ta 1/2 )O 3 .
Inventors
- 👤 Nobuyuki Ohya
- 👤 Toshiki Saburi
- 👤 Toru Yamazaki
- 👤 Taisei Katoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495; C04B35/497
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
101 words
A high frequency wave absorbing ceramics of a ternary composition comprising from 50 to 80 mol % of lead iron niobate Pb(Fe 1/2 Nb 1/2 )O 3 , from 10 to 40 mol % of lead iron tungstate Pb(Fe 2/3 W 1/3 )O 3 and not more than 40 mol % of lead iron tantalate Pb(Fe 1/2 Ta 1/2 )O, based on the total 100 mol % of a composition composed of lead iron niobate Pb(Fe 1/2 Nb 1/2 )O 3 lead iron tungstate Pb(Fe 2/3 W 1/3 )O 3 and lead iron tantalate Pb(Fe 1/2 Ta 1/2 )O 3 .
Claim 2
Dependent Claim
101 words
A high frequency wave absorbing ceramics of a ternary composition comprising from 50 to 80 mol % of lead iron niobate Pb(Fe 1/2 Nb 1/2 )O 3 , from 10 to 40 mol % of lead iron tungstate Pb(Fe 2/3 W 1/3 )O 3 and not more than 40 mol % of lead iron tantalate Pb(Fe 1/2 Ta 1/2 )O, based on the total 100 mol % of a composition composed of lead iron niobate Pb(Fe 1/2 Nb 1/2 )O 3 lead iron tungstate Pb(Fe 2/3 W 1/3 )O 3 and lead iron tantalate Pb(Fe 1/2 Ta 1/2 )O 3 .
Claim 3
Dependent Claim
38 words
The high frequency wave absorbing ceramics according to claim 1, wherein the composition ratio in the ternary composition lies in the inside (including the boundary) of a quadrangle A-B-C-D in the ternary phase diagram shown in Figure 1.
Claim 4
Dependent Claim
89 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-Y)Pb(Fe 1/2 Nb 1/2 )O 3 , - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which the third ingredient composition molar ratio x (hereinafter in claims referred to x) for the ternary system is greater than 0 and not more than 0.35 when the composition molar ratio y (hereinafter in claims referred to y) for the binary system is 0.25 in the above equation.
Claim 5
Dependent Claim
54 words
The high frequency wave absorbing ceramics according to claim 3, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe, Ta 1/2 )O 3 , in which x is from 0.015 to 0.27 when y is 0.25 in the above equation.
Claim 6
Dependent Claim
54 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 - yPb(Fe2m W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 , in which x is from 0.025 to 0.28 when y is 0.35 in the above equation.
Claim 7
Dependent Claim
56 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 , - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 , in which x is from 0.075 to 0.35 when y is 0.15 in the above equation.
Claim 8
Dependent Claim
57 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb1 1/2 )O 3 - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which x is from 0.025 to 0.28 when y is from 0.25 to 0.35 in the above equation.
Claim 9
Dependent Claim
54 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )0, - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 , in which y is from 0.16 to 0.41 when x is 0.05 in the above equation.
Claim 10
Dependent Claim
54 words
The high frequency wave absorbing ceramics according to claim 8, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which y is from 0.19 to 0.33 when x is 0.05 in the above equation.
Claim 11
Dependent Claim
54 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which y is from 0.25 to 0.35 when x is 0.025 in the above equation.
Claim 12
Dependent Claim
55 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 , in which y is from 0.35 to 0.42 when x is 0.15 in the above equation.
Claim 13
Dependent Claim
52 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Fb(Fe 1/2 Nb )0, - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which y is from 0.15 to 0.25 when x is 0.2 in the above equation.
Claim 14
Dependent Claim
54 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 - yPb(Fe 2/3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which y is from 0.12 to 0.34 when x is 0.3 in the above equation.
Claim 15
Dependent Claim
59 words
The high frequency wave absorbing ceramics according to claim 1, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 Nb 1/2 )O 3 - yPb(Fe 2 j 3 W 1/3 )O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which y is from 0.17 to 0.36 when x is from 0.025 to 0.2 in the above equation.
Claim 16
Dependent Claim
55 words
The high frequency wave absorbing ceramics according to claim 14, wherein the ternary composition is expressed as (1-x){(1-y)Pb(Fe 1/2 )O 3 - yPb(Fe 2/3 W 1/3 O 3 } - xPb(Fe 1/2 Ta 1/2 )O 3 in which y is from 0.2 to 0.33 when x is from 0.025 to 0.05 in the above equation.
Claim 17
Dependent Claim
148 words
The high frequency wave absorbing ceramics according to claim 1, which is prepared by mixing: a powder of lead iron niobate Pb(Fe 1/2 Nb 1/2 )O, comprising 4 mol % of lead oxide powder (PbO), 1 mol % of iron oxide powder (Fe,O,) and 1 mol % of niobium oxide (Nb,O,), a powder of lead iron tungstate Pb(Fe 2/3 W 1/3 )O 3 comprising 3 mol % of lead oxide powder (PbO), 1 mol % of iron oxide powder (Fe,O,) and 1 mol % of tungsten oxide powder (WO,) and a powder of lead iron tantalate Pb(Fe 1/2 Ta 1/2 )O 3 comprising 4 mol % of lead oxide powder (PbO), 1 mol % of tantalum oxide powder (Ta,O,) and 1 mol % of iron oxide (Fe,O,), so as to provide a predetermined composition ratio, molding and then sintering them at a temperature of from 1,000 to 1,150°C.
References Cited (Backward Citations)
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