The abnormal increase of tunability in ferroelectric-dielectric composite ceramics and its origin

The anomalous increase in tunability in Ba0.55Sr0.45TiO3‐MgO‐Mg2SiO4 composite ceramics

“…Therefore, with the increase in dielectric concentration, the tunability of composite ceramics increases first and then decreases although there exist some small fluctuations. Similar results were reported in BST‐Mg 2 TiO 4 and BST‐Mg 2 TiO 4 ‐MgO systems. These results support further our previous speculation that the anomalous increase in tunability exists universally in ferroelectric‐dielectric composites.…”

“… and , and speculated that the abnormal increase in tunability exists universally in ferroelectric‐dielectric composite . More recently, we observed that the abnormal increase in tunability also emerged in Ba 0.45 Sr 0.55 TiO 3 –MgO–Mg 2 TiO 4 system, which supports our speculation. We have investigated the dielectric tunable properties of BST–Mg 2 SiO 4 –MgO composite ceramics previously .…”

“…Many experimental results are consistent with this argument . Therefore, the anomalous increase in the tunability in ferroelectric‐dielectric composite is quite strange and incredible because it is contrary to our intuition. Simultaneous reduction in dielectric constant and increase in tunability are beneficial to tunable microwave applications.…”

“…This is because we did not take account of the doping effect in our simulation. As mentioned above, doping effect causes the abrupt reduction in tunability . The substitution of Ti 4+ by Mg 2+ is inevitable during preparation procedure, the composite effect will superimpose on doping effect.…”

Structural and Dielectric Properties of Ba2+ Substituted Lead-Barium-Titanate Ceramics

“…These properties make them potential candidates for the application in the field of capacitors, switches, transducers, ferroelectric memories, waveguides, optical memory displays, tunable capacitors, phase shifters, delay lines, ferroelectricphotovoltaic (FE-PV) devices, etc. The recent trends in ferroelectric researches are the electrocaloric effect and ferroelectric liquid crystals [1][2][3][4][5][6][7][8][9][10][11][12].…”