Improving the piezoelectric properties of CBN‐based ceramic by a Ce ion

Abstract

CaBi 2 Nb 2 O 9 (CBN), one of the bismuth-layered structural ferroelectrics, with high Curie temperature (T C ), has great potential in high-temperature applications. In this work, high Curie temperature and piezoelectric constant (d 33 ) are realized in modified CaBi 2 Nb 2 O 9 ceramics with Ce-substitution. Ce-substitution changes the crystal structures and domain structures of CBN-based ceramics, so as to improve the piezoelectric properties. The optimal performances are obtained with a high d 33 value (∼18.0 pC/N) and a T C value (∼930 • C), together with a low tan δ value (∼0.028 at 500 • C). Moreover, the thermal stability is also enhanced, where the d 33 value maintains 93.9% of its original value after annealing at 900 • C for 2 h. Thus, these findings play a meaningful role in devices manufacturing, where the apply temperature is often more than 500 • C.

Enhancing fire resistance in wood with high-water retention silica gel: A promising flame-retardant solution

“…Furthermore, water molecules may easily cover the entire outer layer of the silica gel due to the substantial surface area and minute pores of silica. [30]. Consequently, the water contained in silica gel is a combination of both chemically and physically adsorbed water.…”

The effect of Li/Ce co‐doping on structural and electrical properties of Sr2−x(Li, Ce)x/2Nb2O7 piezoelectric ceramics

“…It is understood that (Li, Ce) co‐doped bismuth layer‐structured ferroelectric (BLSF) ceramics with a structure similar to PLS ceramics have excellent piezoelectric and resistivity enhancement 18–21 . The doping of (Li, Ce) ions alters the crystal structure and domain structure of ceramics, affects the growth of grains, and thus improves the electrical properties.…”

“…It is understood that (Li, Ce) co-doped bismuth layerstructured ferroelectric (BLSF) ceramics with a structure similar to PLS ceramics have excellent piezoelectric and resistivity enhancement. [18][19][20][21] The doping of (Li, Ce) ions alters the crystal structure and domain structure of ceramics, affects the growth of grains, and thus improves the electrical properties. Therefore, in this work, (Li, Ce) co-doped SNO ceramics are prepared by the solid-state reaction method and the effects of doping on the structure and electrical properties of ceramics are investigated.…”