In:
Japanese Journal of Applied Physics, IOP Publishing, Vol. 44, No. 9S ( 2005-09-01), p. 7089-
Abstract:
Cation substitution for the Ba 2+ and Ti 4+ sites in the BaTiO 3 structure was attempted in low-fired glass-ceramics derived from glass powders that have perovskite phase compositions corresponding to (BaTiO 3 :REAlO 3 ) = 9:1 and 8:2 (RE=La, Nd and Sm) to control the Curie temperature ( T c ) of the ferroelectric glass-ceramics. The La 3+ -substituted (9:1) sample heated at 950°C for 24 h showed a broadened ε r –temperature relationship with substantial lowering in T c to ∼-55°C. The Ba:La ratio in the perovskite particles was estimated to be in the range of 4:1–6.7:1, whereas very little Al 3+ was incorporated into the same particles. It was found that the T c of the glass-ceramics fabricated in our serial study could be adjusted by A-site cation substitution in BaTiO 3 . Tailored glass-ceramic samples with room temperature ε r of 200–300 and T c of around 0°C had good microwave tunability of 30–40% under dc bias voltage of 10–50 kV/cm. The high tuning sensitivity of the low-fired glass-ceramics was confirmed by comparative examination of the dielectric properties of well-crystallized ceramics and thin films.
Type of Medium:
Online Resource
ISSN:
0021-4922
,
1347-4065
DOI:
10.1143/JJAP.44.7089
Language:
Unknown
Publisher:
IOP Publishing
Publication Date:
2005
detail.hit.zdb_id:
218223-3
detail.hit.zdb_id:
797294-5
detail.hit.zdb_id:
2006801-3
detail.hit.zdb_id:
797295-7
