# US 9,006,122 B2 · Dielectric ceramic and dielectric filter having the same

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- Number: US 9,006,122 B2
- Document ID: US9006122B2
- Status: Granted
- Kind: B2
- Application number: 13/997,192
- Filed: 2011-12-22
- Published: 2013-11-07
- Granted: 2015-04-14
- Earliest claimed: 2010-12-22
- Assignees: KYOCERA Corporation
- Applicants: Tsuyoshi Komatsu; Satoshi Toyoda; Hidehiro Takenoshita
- Inventors: Tsuyoshi Komatsu; Satoshi Toyoda; Hidehiro Takenoshita
- Web page: https://patentgrep.com/patent/US9006122B2

## CPC

- C04B 35/46: based on titanium oxides or titanates (containing also zirconium or hafnium oxides, zirconates or hafnates C04B35/49)
- C01G 23/047: Titanium dioxide
- C01G 25/006: {Compounds containing zirconium, with or without oxygen or hydrogen, and containing two or more other elements}
- C04B 35/49: containing also titanium oxides or titanates
- H01B 3/12: ceramics
- H01P 1/20: Frequency-selective devices, e.g. filters
- C01P 2002/52: containing elements as dopants
- C01P 2002/54: one element only
- C01P 2006/42: Magnetic properties
- C01P 2006/80: Compositional purity
- C04B 2235/3225: Yttrium oxide or oxide-forming salts thereof
- C04B 2235/3251: Niobium oxides, niobates, tantalum oxides, tantalates, or oxide-forming salts thereof
- C04B 2235/3256: Molybdenum oxides, molybdates or oxide forming salts thereof, e.g. cadmium molybdate
- C04B 2235/3267: MnO2
- C04B 2235/3281: Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
- C04B 2235/3284: Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
- C04B 2235/3293: Tin oxides, stannates or oxide forming salts thereof, e.g. indium tin oxide [ITO]
- C04B 2235/3298: Bismuth oxides, bismuthates or oxide forming salts thereof, e.g. zinc bismuthate
- C04B 2235/3418: Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
- C04B 2235/447: Phosphates or phosphites, e.g. orthophosphate or hypophosphite
- C04B 2235/727: Phosphorus or phosphorus compound content
- C04B 2235/77: Density
- C04B 2235/85: Intergranular or grain boundary phases
- C04B 2235/96: Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- C01G: COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F (metal hydrides {monoborane, diborane or addition complexes thereof} C01B6/00; salts of oxyacids of halogens C01B11/00; peroxides, salts or peroxyacids C01B15/00; thiosulfates, dithionites, polythionates C01B17/64; compounds containing selenium, or tellurium C01B19/00; binary compounds of nitrogen with metals C01B21/06; azides C01B21/08; {compounds containing nitrogen, other non-metals and metal C01B21/082}; metal amides C01B21/092; nitrites C01B21/50; {compounds of noble gases C01B23/0005}; phosphides C01B25/08; salts of oxyacids of phosphorus C01B25/16; carbides C01B32/90; compounds containing silicon C01B33/00; compounds containing boron C01B35/00; compounds having molecular sieve properties but not having base-exchange properties C01B37/00; compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites, C01B39/00; cyanides C01C3/08; salts of cyanamide C01C3/16; thiocyanates C01C3/20)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- H01P: WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE (operating at optical frequencies G02B)
- C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS

## Abstract

There are provided a dielectric ceramic having a high Qf value in a relative permittivity ∈r range of 35 to 45, and a small absolute value of a temperature coefficient τf which indicates change of the resonant frequency in a wide temperature range from a low temperature range to a high temperature range, and a dielectric filter having the dielectric ceramic. A dielectric ceramic includes: a main component, molar ratios α, β, and γ satisfying expressions of 0.240≦α≦0.470, 0.040≦β≦0.200, 0.400≦γ≦0.650, and α+β+γ=1 when a composition formula of the main component is represented as αZrO2.βSnO2.γTiO2; and Mn, a content of Mn in terms of MnO2 being greater than or equal to 0.01% by mass and less than 0.1% by mass with respect to 100% by mass of the main component.

## Claims

### Claim 1

A dielectric ceramic, comprising:
a main component, molar ratios α, β, and γ satisfying the following expressions when a composition formula of the main component is represented as αZrO2.βSnO2.γTiO2:
0.240≦α≦0.470
0.040≦β≦0.200
0.400≦γ≦0.650
α+β+γ=1;
Mn, a content of Mn in terms of MnO2 being greater than or equal to 0.01% by mass and less than 0.1% by mass with respect to 100% by mass of the main component; and
oxides of Si, Nb, Zn, and Cu,
wherein a total content of Si, Nb, Zn, and Cu in terms of SiO2, Nb2O5, ZnO, and CuO is less than or equal to 0.3% by mass but not including 0% by mass with respect to 100% by mass of the main component.

### Claim 2 (depends on 1)

The dielectric ceramic according to claim 1, wherein the molar ratios α, β, and γ of the composition formula satisfy the following expressions:
0.300 ≦α≦0.440
0.080 ≦β≦0.150
0.420 ≦γ≦0.600
α+β+γ=1, and
a content of Mn in terms of MnO2 is greater than or equal to 0.02% by mass and less than or equal to 0.07% by mass with respect to 100% by mass of the main component.

### Claim 3 (depends on 1)

The dielectric ceramic according to claim 1,
wherein a compound formed of oxides containing Mn, Zr, and Ti is present in its grain boundary.

### Claim 4 (depends on 1)

The dielectric ceramic according claim 1,
wherein a ceramic density is greater than or equal to 5.16 g/cm3.

### Claim 5 (depends on 1)

The dielectric ceramic according to claim 1,
wherein a content of P in terms of P2O5 is less than or equal to 0.7% by mass but not including 0% by mass with respect to 100% by mass of the main component.

### Claim 6 (depends on 1)

The dielectric ceramic according to claim 1, further comprising:
at least one of oxides of Mo, Y, and Bi,
wherein a total content of Mo, Y, and Bi in terms of MoO3, Y2O3, and Bi2O3 is less than or equal to 0.1% by mass but not including 0% by mass with respect to 100% by mass of the main component.

### Claim 7 (depends on 1)

The dielectric ceramic according to claim 1, further comprising:
a crystal phase of Ti0.8Sn0.2O2.

### Claim 8 (depends on 1)

A dielectric filter, comprising:
the dielectric ceramic according to claim 1;
an input terminal that is electromagnetically coupled with the dielectric ceramic and to which an electric signal is inputted from outside; and
an output terminal that is electromagnetically coupled with the dielectric ceramic and from which an electric signal corresponding to a resonant frequency of the dielectric ceramic is selectively outputted.

### Claim 9

A dielectric ceramic, comprising: a main component, molar ratios α, β, and γsatisfying the following expressions when a composition formula of the main component is represented as αZrO2.βSnO2.γTiO2:
0.240≦α≦0.470
0.040≦β≦0.200
0.400≦γ≦0.650
α+β+γ=1;
Mn, a content of Mn in terms of MnO2 being greater than or equal to 0.01% by mass and less than 0.1% by mass with respect to 100% by mass of the main component,
wherein a content of P in terms of P2O5 being less than or equal to 0.7% by mass but not including 0% by mass with respect to 100% by mass of the main component.

### Claim 10

A dielectric ceramic, comprising:
a main component, molar ratios α, β, and γ satisfying the following expressions when a composition formula of the main component is represented as αZrO2.βSnO2.γTiO2:
0.240≦α≦0.470
0.040≦β≦0.200
0.400≦γ≦0.650
α+β+γ=1;
Mn, a content of Mn in terms of MnO2 being greater than or equal to 0.01% by mass and less than 0.1% by mass with respect to 100% by mass of the main component; and
at least one of oxides of Mo, Y, and Bi,
wherein a total content of Mo, Y, and Bi in terms of MoO3, Y2O3, and Bi2O3 being less than or equal to 0.1% by mass but not including 0% by mass with respect to 100% by mass of the main component.