Thermally stable Ba0.8Ca0.2TiO3–Bi(Mg0.5Zr0.5)O3 solid solution with low dielectric loss in a broad temperature usage range

Advances in lead‐free high‐temperature dielectric materials for ceramic capacitor application

“…Meanwhile, the dc resistivity for all compositions was on the magnitude order of 10 10 Ωm at 250°C, and 10 7 Ωm at 400°C. Later, Chen et al [56] [57]. Of particular significance that an excellent dc resistivity of 10 9 Ω m at a temperature of 300°C was experimentally reported for 0.7Ba 0.8 Ca 0.2 TiO 3 -0.3Bi(Zn 0.5 Ti 0.5 )O 3 , which possessed high-temperature stability up to 400°C with ɛ r ∼ 1000 [58].…”

“…Choosing a different end member, such as Bi(Mg 0.5 Zr 0.5 )O 3 and Bi(Zn 0.5 Ti 0.5 )O 3 , is also conductive to obtaining a temperature‐stable dielectric. For example, an enhanced thermal stability of permittivity and low‐dielectric loss (tan δ ≤ 0.02) over a broad temperature range of 27–290°C at 1 kHz were obtained in 0.7Ba 0.8 Ca 0.2 TiO 3 –0.3Bi(Mg 0.5 Zr 0.5 )O 3 ceramic materials designed by Huang et al [57]. Of particular significance that an excellent dc resistivity of 10 9 Ω m at a temperature of 300°C was experimentally reported for 0.7Ba 0.8 Ca 0.2 TiO 3 –0.3Bi(Zn 0.5 Ti 0.5 )O 3 , which possessed high‐temperature stability up to 400°C with ɛ r ∼ 1000 [58].…”

Dielectric temperature stability and energy storage performance of NBT‐based ceramics by introducing high‐entropy oxide

“… 3,10–12 Ca 2+ is usually doped BT to form RFEs. Combined with the low T c of BT, it is easier to obtain good ε ′ stability at lower temperatures 11,13,14 . However, the ε ′ values of many BT‐based systems are commonly reduced to less than 2000 or even 1000 by introducing Ca 2+ 11,13,14 .…”

“…Combined with the low T c of BT, it is easier to obtain good ε ′ stability at lower temperatures 11,13,14 . However, the ε ′ values of many BT‐based systems are commonly reduced to less than 2000 or even 1000 by introducing Ca 2+ 11,13,14 . The ε ′‐stable interval of KNN‐based ceramics can extend to higher temperature (> 400°C), but the tan δ is difficult to be suppressed (usually tan δ > 0.02) 1,10,12 .…”

“…11,13,14 However, the ε′ values of many BT-based systems are commonly reduced to less than 2000 or even 1000 by introducing Ca 2+ . 11,13,14 The ε′-stable interval of KNN-based ceramics can extend to higher temperature (> 400 • C), but the tanδ is difficult to be suppressed (usually tanδ > 0.02). 1,10,12 In contrast, many NBT-based RFE ceramics exhibit two diffuse thermal-evolution-related phase transition peaks (R3C ↔ P4bm), which suggests that the variation of ε′ value between the two peaks is small, benefiting to achieve the high stability of ε′.…”