← Back to Patent Explorer
EP0252668A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Dielectric ceramics

Assignee: Sumitomo Metal Mining Co Ltd
•
Filing: 1987-06-30
•
Granted: —
•
Expires: 2007-06-30
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A dielectric ceramics which has a composition represented by the following general formula (I) and having a substantially perovskite crystal structure: (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z ) u O p ... (I) wherein x, y, z, u, w and p satisfy one selected from the following conditions: x = 0, w = 0, z = 0, 0.001 ≦ y ≦ 0.088, 0.66 ≦ u < 0.72, and p represents a number with which the charges of the cations of Ba, Mg, Ni and Ta are neutralized, whereby the entire composition is electrically neutralized; x = 0, z = 0, 0.001 ≦ y ≦ 0.40, 0.001 ≦ w ≦ 0.40, 0.61 ≦ u ≦ 0.72, 0.002 ≦ y + w ≦ 0.40 and p represents a number with which the charges of the cations of Ba, Mg, Ni, Co and Ta are neutralized, whereby the entire composition is electrically neutralized; x = 0, w = 0, 0.04 ≦ y ≦ 0.90, 0.10 ≦ z < 0.96, 0.61 ≦ u ≦ 0.72, and p represents a number with which the charges of the cations of Ba, Mg, Ni, Nb and Ta are neutralized, whereby the entire composition is electrically neutralized; and w = 0, 0 < x ≦ 0.25, 0 ≦ y ≦ 0.5, 0 ≦ z ≦ 0.8, 0.61 ≦ u ≦ 0.72, and p represents a number with which the charges of the cations of Ba, Sr, Mg, Ni, Ta and Nb are neutralized, whereby the entire composition is electrically neutralized.

Inventors

  • 👤 Kazutoshi Mausumoto
  • 👤 Takehiro Hyuga

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 18:13
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/495

Claims Analysis

Total Claims: 12
Claim 1
Independent Claim 82 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z )O p ... (I) wherein x = 0, w = o, z = 0, 0.001 ≦ y ≦ 0.088, 0.66 ≦ y < 0.72, and p represents a number with which the charges of the cations of Ba, Mg, Ni and Ta are neutralized, whereby the entire composition is electrically neutralized.
Claim 2
Dependent Claim 82 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z )O p ... (I) wherein x = 0, w = o, z = 0, 0.001 ≦ y ≦ 0.088, 0.66 ≦ y < 0.72, and p represents a number with which the charges of the cations of Ba, Mg, Ni and Ta are neutralized, whereby the entire composition is electrically neutralized.
Claim 3
Dependent Claim 12 words
A ceramics according to Claim 1, wherein 0.66 ≦ u ≦ 0.68.
Claim 4
Dependent Claim 94 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z ) u O p ... (I) wherein x = 0, z = 0, 0.001 ≦ y ≦ 0.40, 0.001 ≦ w ≦ 0.40, 0.61 ≦ u ≦ 0.72, 0.002 ≦ y + w ≦ 0.40, and p represents a number with which the charges of the cations of Ba, Mg, Ni, Co and Ta are neutralized, whereby the entire composition is electrically neutralized.
Claim 5
Dependent Claim 94 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z ) u O p ... (I) wherein x = 0, z = 0, 0.001 ≦ y ≦ 0.40, 0.001 ≦ w ≦ 0.40, 0.61 ≦ u ≦ 0.72, 0.002 ≦ y + w ≦ 0.40, and p represents a number with which the charges of the cations of Ba, Mg, Ni, Co and Ta are neutralized, whereby the entire composition is electrically neutralized.
Claim 6
Dependent Claim 14 words
A ceramics according to Claim 3, wherein 0.002 ≦ y + w ≦ 0.35.
Claim 7
Dependent Claim 12 words
A ceramics according to Claim 1, wherein 0.66 ≦ u ≦ 0.68.
Claim 8
Dependent Claim 87 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z ) u O p ... (I) wherein x = 0, w = 0, 0.04 ≦ y ≦ 0.90, 0.10 ≦ z ≦ 0.96, 0.61 ≦ u ≦ 0.72, and p represents a number with which the charges of the cations of Ba, Mg, Ni, Nb and Ta are neutralized, whereby the entire composition is electrically neutralized.
Claim 9
Dependent Claim 87 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z ) u O p ... (I) wherein x = 0, w = 0, 0.04 ≦ y ≦ 0.90, 0.10 ≦ z ≦ 0.96, 0.61 ≦ u ≦ 0.72, and p represents a number with which the charges of the cations of Ba, Mg, Ni, Nb and Ta are neutralized, whereby the entire composition is electrically neutralized.
Claim 10
Dependent Claim 12 words
A ceramics according to Claim 6, wherein 0.66 ≦ u ≦ 0.68.
Claim 11
Dependent Claim 90 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z ) u O p ... (I) wherein w = 0, 0 < x ≦ 0.25, 0 ≦ y ≦ 0.5, 0 ≦ z ≦ 0.8, 0.61 ≦ u ≦ 0.72, and p represents a number with which the charges of the cations of Ba, Sr, Mg, Ni, Ta and Nb are neutralized, whereby the entire composition is electrically neutralized.
Claim 12
Dependent Claim 90 words
A dielectric ceramics having a composition represented by the following general formula (I) : (Ba 1-x Sr x ) (Mg 1-y-w Ni y Co w ) 1-u (Ta 1-z Nb z ) u O p ... (I) wherein w = 0, 0 < x ≦ 0.25, 0 ≦ y ≦ 0.5, 0 ≦ z ≦ 0.8, 0.61 ≦ u ≦ 0.72, and p represents a number with which the charges of the cations of Ba, Sr, Mg, Ni, Ta and Nb are neutralized, whereby the entire composition is electrically neutralized.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag