Structure and dielectric properties of Nd substituted Bi1.5MgNb1.5O7 ceramics
New pyrochlore ceramics Bi (1.5− x ) Nd x MgNb 1.5 O 7 with x = 0–0.6 were synthesized by doping Nd into the A site in the Bi 1.5 MgNb 1.5 O 7 pyrochlore. The Nd substituted Bi 1.5 MgNb 1.5 O 7 ceramics were prepared utilizing solid-state reaction and investigated by X-ray diffraction, scanning ele...
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Published in | Journal of materials science. Materials in electronics Vol. 24; no. 8; pp. 2785 - 2789 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Boston
Springer US
01.08.2013
Springer |
Subjects | |
Online Access | Get full text |
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Summary: | New pyrochlore ceramics Bi
(1.5−
x
)
Nd
x
MgNb
1.5
O
7
with
x
= 0–0.6 were synthesized by doping Nd into the A site in the Bi
1.5
MgNb
1.5
O
7
pyrochlore. The Nd substituted Bi
1.5
MgNb
1.5
O
7
ceramics were prepared utilizing solid-state reaction and investigated by X-ray diffraction, scanning electron microscope and dielectric measurements. The crystal structure was characterized as single cubic pyrochlore phase for
x
≤ 0.5 while the second phase appeared at
x
= 0.6. With increasing Nd content from 0 to 0.5, the lattice parameters decreased slightly and the average grain size pronouncedly reduced from ~7.5 to ~5.0 μm. The Nd incorporation resulted in attractive enhancement of the dielectric properties including the temperature coefficient of dielectric constant that was remarkably optimized with the lowest value of −16 ppm/°C at
x
= 0.5. A good combination of low dielectric loss, superior temperature coefficient and high dielectric permittivity can be achieved for the composition of
x
= 0.5, which seems to be very appealing for the practical use in high-frequency multilayer ceramic capacitors. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-013-1171-9 |