Li2MoO4-based composite ceramics fabricated from temperature- and atmosphere-sensitive MnZn ferrite at room temperature.
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| Title: | Li |
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| Authors: | Väätäjä, Maria1 maria.vaataja@oulu.fi, Kähäri, Hanna1, Juuti, Jari1, Jantunen, Heli1 |
| Source: | Journal of the American Ceramic Society. Aug2017, Vol. 100 Issue 8, p3626-3635. 10p. 1 Color Photograph, 1 Chart, 5 Graphs. |
| Subjects: | Ferrite circulators, Circulators (Electrical engineering), Ferrite devices, Ceramics, Construction materials |
| Abstract: | The first magnetic ceramic composites manufactured, using the room-temperature densification method are reported. The samples were prepared at room temperature using Li2MoO4 as a matrix and MnZn ferrite with loading levels of 10-30 vol-% followed by postprocessing at 120°C. The method utilizes the water solubility of the dielectric Li2MoO4 and compression pressure instead of high temperatures typical of conventional solid-state sintering. Hence, composite manufacturing using temperature- and atmosphere-sensitive materials is possible without special conditions. This was demonstrated with MnZn ferrite, which is prone to oxidation when heat treated in air. Samples manufactured with room-temperature densification showed no signs of reactivity during processing, whereas reference samples sintered at 685°C suffered from oxidation and formation of an additional reaction phase. The densities achieved with different loading levels of MnZn ferrite with both methods were very similar. Measurements up to 1 GHz showed relatively high values of relative permittivity (21.7 at 1 GHz) and permeability (2.6 at 1 GHz) with 30 vol-% loading of MnZn ferrite in the samples manufactured by room-temperature densification. In addition, pre-granulation is proposed to improve the processability of the composite powders in room-temperature densification. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 124454949 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Li<subscript>2</subscript>MoO<subscript>4</subscript>-based composite ceramics fabricated from temperature- and atmosphere-sensitive MnZn ferrite at room temperature. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Väätäjä%2C+Maria%22">Väätäjä, Maria</searchLink><relatesTo>1</relatesTo><i> maria.vaataja@oulu.fi</i><br /><searchLink fieldCode="AR" term="%22Kähäri%2C+Hanna%22">Kähäri, Hanna</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Juuti%2C+Jari%22">Juuti, Jari</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Jantunen%2C+Heli%22">Jantunen, Heli</searchLink><relatesTo>1</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+the+American+Ceramic+Society%22">Journal of the American Ceramic Society</searchLink>. Aug2017, Vol. 100 Issue 8, p3626-3635. 10p. 1 Color Photograph, 1 Chart, 5 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Ferrite+circulators%22">Ferrite circulators</searchLink><br /><searchLink fieldCode="DE" term="%22Circulators+%28Electrical+engineering%29%22">Circulators (Electrical engineering)</searchLink><br /><searchLink fieldCode="DE" term="%22Ferrite+devices%22">Ferrite devices</searchLink><br /><searchLink fieldCode="DE" term="%22Ceramics%22">Ceramics</searchLink><br /><searchLink fieldCode="DE" term="%22Construction+materials%22">Construction materials</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The first magnetic ceramic composites manufactured, using the room-temperature densification method are reported. The samples were prepared at room temperature using Li2MoO4 as a matrix and MnZn ferrite with loading levels of 10-30 vol-% followed by postprocessing at 120°C. The method utilizes the water solubility of the dielectric Li2MoO4 and compression pressure instead of high temperatures typical of conventional solid-state sintering. Hence, composite manufacturing using temperature- and atmosphere-sensitive materials is possible without special conditions. This was demonstrated with MnZn ferrite, which is prone to oxidation when heat treated in air. Samples manufactured with room-temperature densification showed no signs of reactivity during processing, whereas reference samples sintered at 685°C suffered from oxidation and formation of an additional reaction phase. The densities achieved with different loading levels of MnZn ferrite with both methods were very similar. Measurements up to 1 GHz showed relatively high values of relative permittivity (21.7 at 1 GHz) and permeability (2.6 at 1 GHz) with 30 vol-% loading of MnZn ferrite in the samples manufactured by room-temperature densification. In addition, pre-granulation is proposed to improve the processability of the composite powders in room-temperature densification. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of the American Ceramic Society is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1111/jace.14914 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 10 StartPage: 3626 Subjects: – SubjectFull: Ferrite circulators Type: general – SubjectFull: Circulators (Electrical engineering) Type: general – SubjectFull: Ferrite devices Type: general – SubjectFull: Ceramics Type: general – SubjectFull: Construction materials Type: general Titles: – TitleFull: Li2MoO4-based composite ceramics fabricated from temperature- and atmosphere-sensitive MnZn ferrite at room temperature. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Väätäjä, Maria – PersonEntity: Name: NameFull: Kähäri, Hanna – PersonEntity: Name: NameFull: Juuti, Jari – PersonEntity: Name: NameFull: Jantunen, Heli IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 08 Text: Aug2017 Type: published Y: 2017 Identifiers: – Type: issn-print Value: 00027820 Numbering: – Type: volume Value: 100 – Type: issue Value: 8 Titles: – TitleFull: Journal of the American Ceramic Society Type: main |
| ResultId | 1 |
