Disordered Structures and Dielectric Properties of Ni-Doped Bismuth Magnesium Niobate Pyrochlores

2021 ◽  
Author(s):  
Libin Gao ◽  
Kexin Liang ◽  
Zhipu Guan ◽  
Zhongzhe Liu ◽  
Zhen Fang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Magnesium Niobate ◽  
Disordered Structures

Role of excess PbO on the microstructure and dielectric properties of lead magnesium niobate

1995 ◽  
Vol 10 (4) ◽  
pp. 953-961 ◽  
Author(s):  
S.M. Gupta ◽  
A.R. Kulkarni
Keyword(s):  
Dielectric Properties ◽  
Pyrochlore Phase ◽  
Careful Analysis ◽  
Lead Magnesium Niobate ◽  
Second Phase ◽  
Relaxor Behavior ◽  
Magnesium Niobate ◽  
Excess Lead ◽  
Lead Magnesium

Stoichiometric and 2 wt. % excess lead oxide containing lead magnesium niobate (PMN) ceramics have been prepared by partial oxalate route. Dielectric measurements with frequency showed a typical relaxor behavior for stoichiometric PMN, while PMN with excess PbO shows a scatter in the dielectric curves at all temperatures above Tc. Under the same processing conditions, the dielectric constant (Kmax) decreases drastically from 16,300 to 9500 at 1 KHz for PMN without and with excess PbO, respectively. Microstructure studies revealed a second phase (unreacted PbO) segregated in the grain boundaries for excess PbO samples. A careful analysis of the data on dielectric properties and phases present coupled with microstructural detail indicate that the second phase in the grain boundary has a pronounced effect on the dielectric properties and not the pyrochlore phase.

Dielectric Properties of 0-3 Lead Magnesium Niobate Titanate (PMNT)-Ordinary Portland Cement (PC) Composites

2009 ◽  
Vol 421-422 ◽  
pp. 407-410 ◽  
Author(s):  
Nittaya Jaitanong ◽  
Arnon Chaipanich
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Lead Magnesium Niobate ◽  
Magnesium Niobate ◽  
Lead Magnesium

The dielectric properties of lead magnesium niobate titanate, PMNT and portland cement, PC with x(0.67PMN-0.33PT)-(1-x)(PC) (where x = 0.3, 0.5, 0.7 and 1.0) composites were investigated. The dielectric properties of the 0-3 PMNT-PC composites are measured as function of both room temperatures and frequency. The composites were pressed together and cured in 98%RH curing chamber for 3 days before measurements. The results indicate that the dielectric properties of the PMNT-PC composites increased with increasing PMNT content with dielectric constant, r obtained for the composites with 0.3, 0.5 and 0.7PMNT with dielectric constant, r values of a 136, 414 and 647 respectively.

Energy Economised Strategy for Synthesis of Silica and Graphene Oxide Modified Porous Barium Magnesium Niobate Ceramic with Enhanced Dielectric Properties

2019 ◽  
Vol 11 (8) ◽  
pp. 1118-1125
Author(s):  
Waheed Qamar Khan ◽  
Muhammad Ali ◽  
Muhammad Junaid Anjum ◽  
Tahira Mehtab ◽  
Ghulam Yasin ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Dielectric Properties ◽  
Magnesium Niobate
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