Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.]
The present invention relates to the synthesis and characterization of bismuth magnesium tantalate dielectrics (BMT pyrochlores), and to their structural and electrical properties. Ceramic compositions produced in this invention include Bi3^Mg2Ta3O14, Bi2Mg2/3Ta4/3O7 and Bi3+(5/2)xMg2-xTa3-(3/2)xO14...
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| Format: | Book Section |
| Language: | en |
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Bahagian Penyelidikan dan Jaringan Industri, UiTM Melaka
2012
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| Online Access: | https://ir.uitm.edu.my/id/eprint/65206/1/65206.pdf https://ir.uitm.edu.my/id/eprint/65206/ |
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| _version_ | 1833073118379245568 |
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| author | Kar Ban, Tan Zainal, Zulkarnain Chwin Chieh, Khaw Phei Yi, Tan Soo Kien, Chen |
| author_facet | Kar Ban, Tan Zainal, Zulkarnain Chwin Chieh, Khaw Phei Yi, Tan Soo Kien, Chen |
| author_sort | Kar Ban, Tan |
| building | Tun Abdul Razak Library |
| collection | Institutional Repository |
| content_provider | Universiti Teknologi Mara |
| content_source | UiTM Institutional Repository |
| continent | Asia |
| country | Malaysia |
| description | The present invention relates to the synthesis and characterization of bismuth magnesium tantalate dielectrics (BMT pyrochlores), and to their structural and electrical properties. Ceramic compositions produced in this invention include Bi3^Mg2Ta3O14, Bi2Mg2/3Ta4/3O7 and Bi3+(5/2)xMg2-xTa3-(3/2)xO14-x; phase pure sub solidus solution as represented by Bi3+(5/2)xMg2-xTa3-(3/2)xO14-x, wherein 0.12 < x < 0.22 able to be produced. This invention also discloses a method of preparation of the BMT pyrochlore, in which Bi2O3, MgO and Ta2O5 in stoichiometric amounts are mixed homogeneously with acetone, pre-treated at 300 °C to 600 °C for at least one hour to ensure that the Bi2O3 reacts to form less-volatile compounds, the pre-treated powders are subsequently heated at 800 °C overnight, and further synthesized at 1025 °C for 48 hours, preferably with intermediate regrinding. The compositions of invention have outstanding bulk dielectric properties, e.g. e' values of between 74 - 85 at frequency 1 MHz at ~25oC, TCe' of -158 to -328 ppm/°C at 1 MHz in the range of ~25°C - 300°C and tan 6 in the order of 10-3 at 1 MHz, ~25oC. The bismuth magnesium tantalate dielectrics are suitable particularly for ceramic based capacitor application. |
| format | Book Section |
| id | my.uitm.ir-65206 |
| institution | Universiti Teknologi Mara |
| language | en |
| publishDate | 2012 |
| publisher | Bahagian Penyelidikan dan Jaringan Industri, UiTM Melaka |
| record_format | eprints |
| spelling | my.uitm.ir-652062022-09-27T15:23:04Z https://ir.uitm.edu.my/id/eprint/65206/ Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.] Kar Ban, Tan Zainal, Zulkarnain Chwin Chieh, Khaw Phei Yi, Tan Soo Kien, Chen QD Chemistry Magnesium Physical and theoretical chemistry The present invention relates to the synthesis and characterization of bismuth magnesium tantalate dielectrics (BMT pyrochlores), and to their structural and electrical properties. Ceramic compositions produced in this invention include Bi3^Mg2Ta3O14, Bi2Mg2/3Ta4/3O7 and Bi3+(5/2)xMg2-xTa3-(3/2)xO14-x; phase pure sub solidus solution as represented by Bi3+(5/2)xMg2-xTa3-(3/2)xO14-x, wherein 0.12 < x < 0.22 able to be produced. This invention also discloses a method of preparation of the BMT pyrochlore, in which Bi2O3, MgO and Ta2O5 in stoichiometric amounts are mixed homogeneously with acetone, pre-treated at 300 °C to 600 °C for at least one hour to ensure that the Bi2O3 reacts to form less-volatile compounds, the pre-treated powders are subsequently heated at 800 °C overnight, and further synthesized at 1025 °C for 48 hours, preferably with intermediate regrinding. The compositions of invention have outstanding bulk dielectric properties, e.g. e' values of between 74 - 85 at frequency 1 MHz at ~25oC, TCe' of -158 to -328 ppm/°C at 1 MHz in the range of ~25°C - 300°C and tan 6 in the order of 10-3 at 1 MHz, ~25oC. The bismuth magnesium tantalate dielectrics are suitable particularly for ceramic based capacitor application. Bahagian Penyelidikan dan Jaringan Industri, UiTM Melaka 2012 Book Section NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/65206/1/65206.pdf Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.]. (2012) In: RIID 2012: Innovation For Sustainable Growth. Bahagian Penyelidikan dan Jaringan Industri, UiTM Melaka, Alor Gajah, Melaka, p. 25. ISBN 9789671135440 (Unpublished) |
| spellingShingle | QD Chemistry Magnesium Physical and theoretical chemistry Kar Ban, Tan Zainal, Zulkarnain Chwin Chieh, Khaw Phei Yi, Tan Soo Kien, Chen Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.] |
| title | Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.] |
| title_full | Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.] |
| title_fullStr | Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.] |
| title_full_unstemmed | Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.] |
| title_short | Dielectric Pyrochlores in Bismuth Magnesium Tantalate Ternary System / Tan Kar Ban … [et al.] |
| title_sort | dielectric pyrochlores in bismuth magnesium tantalate ternary system / tan kar ban … [et al.] |
| topic | QD Chemistry Magnesium Physical and theoretical chemistry |
| url | https://ir.uitm.edu.my/id/eprint/65206/1/65206.pdf https://ir.uitm.edu.my/id/eprint/65206/ |
| url_provider | http://ir.uitm.edu.my/ |