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Investigation of the phase formation and dielectric properties of Bi7Ta3O18


Chon, Mun Ping and Tan, Kar Ban and Khaw, Chwin Chieh and Zainal, Zulkarnain and Yap, Taufiq Yun Hin and Chen, Soo Kien and Tan, Phei Yi (2014) Investigation of the phase formation and dielectric properties of Bi7Ta3O18. Journal of Alloys and Compounds, 590. pp. 479-485. ISSN 0925-8388; ESSN: 1873-4669


Polycrystalline Bi7Ta3O18 was synthesised at the firing temperature of 950 °C over 18 h via conventional solid state method. It crystallised in a monoclinic system with space group C2/m, Z = 4 similar to that reported diffraction pattern in the Inorganic Crystal Structure Database (ICSD), 1-89-6647. The refined lattice parameters were a = 34.060 (3) Å, b = 7.618 (9) Å, c = 6.647 (6) Å with α = γ = 90° and β = 109.210 (7), respectively. The intermediate phase was predominantly in high-symmetry cubic structure below 800 °C and finally evolved into a low-symmetry monoclinic structured, Bi7Ta3O18 at 950 °C. The sample contained grains of various shapes with different orientations in the size ranging from 0.33–22.70 μm. The elemental analysis showed the sample had correct stoichiometry with negligible Bi2O3 loss. Bi7Ta3O18 was thermally stable and it exhibited a relatively high relative permittivity, 241 and low dielectric loss, 0.004 at room temperature, ∼30 °C and frequency of 1 MHz.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.1016/j.jallcom.2013.11.028
Publisher: Elsevier
Keywords: Ceramics; Sintering; Powder diffraction; Dielectric properties
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 19 Jan 2016 05:03
Last Modified: 28 Nov 2016 03:39
Altmetrics: ttp://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.jallcom.2013.11.028
URI: http://psasir.upm.edu.my/id/eprint/34261
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