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US 8,575,052 B2Granted
Dielectric ceramic, method for producing dielectric ceramic, and electronic component
AssigneeTDK Corporation
InventorsToshio Sakurai, Tomohiro Arashi, Hisashi Kobuke, Takahiro Nakano, Tomoko Nakamura, Yasuharu Miyauchi
Life of this patent
Estimating the term…
Abstract
Provided is a dielectric ceramic that includes a main component which contains Mg2SiO4 and additives which contain a zinc oxide and a glass component, in which, in X-ray diffraction. The peak intensity ratio, IB/IA, of the X-ray diffraction peak intensity IB of zinc oxide remaining unreacted, for which 2θ is between 31.0° and 32.0° and between 33.0° and 34.0°, with respect to the peak intensity IA of Mg2SiO4 as the main phase, for which 2θ is between 36.0° and 37.0°, is 10% or less. The dielectric ceramic has a relative density of 96% or greater.
Claims10
A dielectric ceramic comprising:
- a main component which contains Mg2SiO4;
- and
- additives which contain a zinc oxide, a boron oxide, an alkaline earth metal oxide, and a glass component,
- wherein:
- in X-ray diffraction, a peak intensity ratio IB/IA is 10% or less where IA is an X-ray diffraction peak intensity of Mg2SiO4 as a main phase for which 2θ is between 36.0° and 37.0° and IB is an X-ray diffraction peak intensity of unreacted zinc oxide for which 2θ is between 31.0° and 32.0° and between 33.0° and 34.0°,
- the glass component is SiO2—BaO—CaO—Li2O glass,
- a content of the zinc oxide, as determined by calculating a mass of the zinc oxide relative to ZnO, is from 8.0 parts by mass to 20 parts by mass relative to 100 parts by mass of the main component,
- a content of the glass component, as determined by calculating a mass of the glass component relative to SiO2—BaO—CaO—Li2O glass, is from 2.0 parts by mass to 10.0 parts by mass relative to 100 parts by mass of a dielectric composition having all the same additives but without the glass component,
- a content of the boron oxide, as determined by calculating a mass of the boron oxide relative to B2O3, is from 3.0 parts by mass to 10.0 parts by mass relative to 100 parts by mass of the main component,
- a content of the alkaline earth metal oxide, as determined by calculating a mass of the alkaline earth metal oxide relative to RO, where R represents an alkaline earth metal element, is from 1.0 parts by mass to 4.0 parts by mass relative to 100 parts by mass of the main component, and
- the dielectric ceramic has a relative density of 96% or greater.
8 more elements
A dielectric ceramic comprising:
- a main component which contains Mg2SiO4;
- and
- additives which contain a zinc oxide, a glass component, a boron oxide, an alkaline earth metal oxide, and at least one of an aluminum oxide and a titanium oxide, wherein:
- the glass component is SiO2—BaO—CaO—Li2O glass,
- a content of the zinc oxide, as determined by calculating a mass of the zinc oxide relative to ZnO, is from 8.0 parts by mass to 20 parts by mass relative to 100 parts by mass of the main component,
- a content of the glass component, as determined by calculating a mass of the glass component relative to SiO2—BaO—CaO—Li2O glass, is from 2.0 parts by mass to 10.0 parts by mass relative to 100 parts by mass of a dielectric composition having all the same additives but without the glass component,
- a content of the boron oxide, as determined by calculating a mass of the boron oxide relative to B2O3, is from 3.0 parts by mass to 10.0 parts by mass relative to 100 parts by mass of the main component,
- a content of the alkaline earth metal oxide, as determined by calculating a mass of the alkaline earth metal oxide relative to RO, where R represents an alkaline earth metal element, is from 1.0 parts by mass to 4.0 parts by mass relative to 100 parts by mass of the main component,
- a content of the aluminum oxide, as determined by calculating a mass of the aluminum oxide relative to Al2O3, is from 0.1 parts by mass to 10.0 parts by mass relative to 100 parts by mass of the main component, and
- a content of the titanium oxide, as determined by calculating a mass of the titanium oxide relative to TiO2, is from 0.1 parts by mass to 10.0 parts by mass relative to 100 parts by mass of the main component.
7 more elements
Dependencies are inferred from the claim text.