Phase development and dielectric responses in PMN–BNT ceramics

Phase development and dielectric responses in PMNKBT solid solutions

“…The maximum value of ε r observed is 971 at 1kHz frequency. This is greater than that observed by Rao and sankarum 24 ,Weda eta l. 34 for KBT ceramics but this obtained value is much lower than that observed by Yimnirun 33 , Guha 35 and Park and Shrout 36 for PMN ceramic and this value also lower than that observed by Cao 37 and Yimnirun 33 for PMN-33%PT and 0.7PMN-0.3PZT respectively.With increasing KBT content, the maximum transition temperature (T m ) shifts from 75 o c monotonously to higher temperatures at 319 o c and the maximum dielectric constant (ε m ) value significantly rises after adding more KBT, which may be attributed to microstructure and density of material 38 .This behavior is similar to PMN-PT 39 , PMN-BNT 18 and PZT-PMN 38 . & 1MHz for (a) 0.85PMN-0.15KBT, (b) 0.75PMN -0.25KBT,(c) 0.65PMN-0…”

“…Moreover, pure PMN perovskite is very difficult to obtain by solid-state reaction because of the unwanted pyrochlore phase. Thus, mixing PMN with other perovskite compound is expected to enhance the formation of more stabilized perovskite structure which means purer perovskite with lower amount of undesirable pyrochlore phases 18 .…”

High permittivity (1−x)Bi1/2Na1/2TiO3‐xPbMg1/3Nb2/3O3 ceramics for high‐temperature‐stable capacitors

“…Many compounds like CaZrO 3 , CaTiO 3 , NaNbO 3 and K 1/2 Na 1/2 NbO 3 were added to form different solid solution systems with BNT ceramics, but it's still a challenge to achieve low temperature coefficient of capacitance, high permittivity and low dielectric loss in a wide range simultaneously. The PbMg 1/3 Nb 2/3 O 3 (PMN),a prototype relaxor with perovskite structure, demonstrates a quite high maximum permittivity (~13500, 1 kHz) around ‐9°C . Considering this intrinsic characteristic of PMN, if PMN was added to form homogeneous solid solution with BNT, both great dielectric stability and high relative permittivity in wide temperature range could be expected.…”

Ferroelectric relaxor behavior and dielectric spectroscopic study of 0.99(Bi0.5Na0.5TiO3)–0.01(SrNb2O6) solid solution

“…Although, most investigations have been concentrated on the modifications of BNT for applications such as piezoelectric and pyroelectric devices, this material is considered to be good candidate for a high temperature relaxor. Recently, some investigations have been done on the search for the modifications in the BNT-based systems [5,6]. To improve the piezoelectric properties, a number of BNT-based solid solutions, such as BNT-Bi 0.5 K 0.5 TiO 3 [7], (1− x − y)Bi 0.5 Na 0.5 TiO 3 -xB i0.5 K 0.5 TiO 3 -yBi 0.5 Li 0.5 TiO 3 [8], BNT-NaNbO 3 [9], BNT-BaTiO 3 -Bi 0.5 Li 0.5 TiO 3 [10], Bi 0.5 Na 0.5 TiO 3 -SrTiO 3 -Bi 0.5 Li 0.5 TiO 3 [11], BNT-Bi 0.5 K 0.5 TiO 3 -BaTiO 3 [12] and Bi 0.5 Na 0.5 TiO 3 -Bi 0.5 Li 0.5 TiO 3 [13] have been developed and studied intensively [14].…”