Structural and microwave dielectric properties of Ba5-xLaxTixNb4-xO15 ceramicsJournal of Electroceramics - Tập 21 - Trang 137-140 - 2007
L. Fang, S. S. Men, H. Zhang, Z. Q. Liu, H. F. Liu
The structural and microwave dielectric properties of Ba5−x La x Ti x Nb4−x O15
(1 ≤ x ≤ 3) was investigated. The single phase with A5B4O15-type
cation-deficient hexagonal perovskite structure was obtained over the whole
composition range. These ceramics have high dielectric constant up to 56, high
quality factors (Q × f ) up to 35,000, and low temperature coefficient of
resonant frequencies (τ f ... hiện toàn bộ
Thin Film Ferroelectrics for Guided Wave DevicesJournal of Electroceramics - Tập 13 - Trang 135-138 - 2004
B. W. Wessels
Thin film ferroelectrics are being developed for guided wave optical devices. Of
particular interest is BaTiO3 because of its high electro-optic coefficient.
Epitaxial thin films have been deposited by metalorganic chemical vapor
deposition that are suitable for electro-optic devices. Thin film electro-optic
modulators have been fabricated and their optical properties characterized.
Factors that d... hiện toàn bộ
Fabrication and properties of 1–3 connectivity epoxy resin modified cement based piezoelectric compositeJournal of Electroceramics - Tập 48 - Trang 67-73 - 2021
Yan Hu, Haoran Li, Peng Liu, Dongyu Xu
The 1–3 connectivity epoxy resin modified cement based piezoelectric composites
were developed to meet the requirement of concrete structural heath monitoring.
The piezoelectric ceramic volume fraction on piezoelectric, dielectric and
electromechanical coupling properties of the composites were discussed. The
results showed that the relative permittivity of the piezoelectric composites
increases l... hiện toàn bộ
Research on voltage sensitivity of vibration accelerometer based on cymbal transducerJournal of Electroceramics - Tập 21 - Trang 770-773 - 2007
Wang Lina, Li Denghua, Jia Meijuan, Ju Weijun
The cymbal piezocomposite transducer was used as the sensitive element of a new
type of vibration accelerometer. In this paper voltage sensitivity, S v, of the
accelerometer was researched. Voltage sensitivity, S v, as a function of
operation frequency, f, and voltage sensitivity as a function of preinstalled
mass, M, was analyzed. The dimensions of cymbal transducer effecting on voltage
sensitivi... hiện toàn bộ
Mn-doped BaTiO3: Electrical Transport Properties in Equilibrium StateJournal of Electroceramics - - 1997
Chang-Rock Song, Han-Ill Yoo, Jae-Young Kim
The electrical conductivity and thermoelectric power of Mn-doped BaTiO3 (1
mole%) and “undoped” BaTiO3 have been measured as functions of oxygen partial
pressure (in the range of 10-16 to 1 atm) and temperatures (in the range of 900
to 1200°C), and compared with each other to differentiate the effect of the
Mn-addition. It is found that the isothermal conductivity of Mn-doped BaTiO3
varies with in... hiện toàn bộ
Effects of rapid thermal annealing on surface acoustic wave ultraviolet sensors using ZnO nanorods grown on AlN/Si structuresJournal of Electroceramics - Tập 30 - Trang 185-190 - 2013
Duy-Thach Phan, Gwiy-Sang Chung
In this study, we demonstrate a high sensitivity of surface acoustic wave (SAW)
ultraviolet (UV) sensor based on ZnO nanorods (NRs) grown on an aluminum nitride
(AlN)/silicon (Si) layered structure. The one-dimensional ZnO NRs act as a
high-UV sensing material due to their large surface-to-volume ratio. The
fabrication of SAW UV sensor is entirely compatible with micro/nano
electromechanical (M/NE... hiện toàn bộ
Tunable Dielectric Characteristics of 0.9Pb(Fe1/2Nb1/2)O3/0.1CaTiO3Journal of Electroceramics - Tập 15 - Trang 223-227 - 2005
X. Hu, X. M. Chen, T. Wang
Tunable dielectric characteristics of 0.9Pb(Fe1/2Nb1/2)O3/0.1CaTiO3 relaxor
ferroelectric ceramics were investigated as the function of DC bias field and
temperature. High tunability (more than 20%) was obtained in the present
ceramics under a relatively weak DC bias field (1.4 kV/cm). The value of
tunability changed from negative to positive with increasing DC field. For the
simulation of the die... hiện toàn bộ
Hiệu ứng Từ Điện trong Các Hợp Chất Vật Liệu Từ Kích Thích và Áp Điện Dịch bởi AI Journal of Electroceramics - - 2002
Jungho Ryu, Shashank Priya, Kenji Uchino, Hyoun-Ee Kim
Trong vài thập kỷ qua, đã có nhiều nghiên cứu sâu rộng về hiệu ứng từ điện (ME)
trong các vật liệu đơn pha và hợp chất. Sự phân cực điện của một vật liệu dưới
từ trường hoặc sự từ hóa do điện trường gây ra yêu cầu sự hiện diện đồng thời
của sự sắp xếp từ xa của các mô men từ và các đôi điện. Các vật liệu đơn pha gặp
phải nhược điểm là hiệu ứng ME yếu đi nhiều, ngay cả ở nhiệt độ thấp, hạn chế
tính... hiện toàn bộ
#Hiệu ứng từ điện #vật liệu từ kích thích #vật liệu áp điện #hợp chất ME #cảm biến trường từ