@Article{CastroNonoSouzMine:2012:VaReFr,
author = "Castro, Pedro Jos{\'e} and Nono, Maria do Carmo Andrade and
Souza, Jos{\'e} Vitor C. and Mineiro, Sergio Luiz",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de
Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)}",
title = "Variation of resonant frequency with temperature in ceramic
resonators based on Ba<sub>2</sub>Ti<sub>9</sub>O<sub>20</sub>
compositions",
journal = "Materials Science Forum. Advanced Powder Technology VIII Book
Series",
year = "2012",
volume = "727-728",
pages = "539--544",
note = "8th International Latin-American Conference on Powder Technology,
Santa Catarina,6 -9 Nov. 2012",
keywords = "ceramic resonator, frequency stability, barium nanotitanate,
temperature coefficient, microwave properties.",
abstract = "Ceramic samples based on barium nanotitanate (Ba 2Ti 9O 20) have
been produced for application as dielectric resonators aiming at
good microwave properties as high dielectric permittivity, low
dielectric loss, and high frequency stability. Two different
samples were prepared: first a Ba 2Ti 9O 20specimen and second a
1wt% Nb 2O 5-added Ba 2Ti 9O 20composition, using BaO and TiO 2as
precursor materials. Variation of resonant frequency with
temperature is commonly represented by temperature coefficient.
Experimental tests were carried out to determine the dielectric
permittivity (\ε) and the temperature coefficient (\τ)
using a metal box where the specimen was placed between parallel
metal surfaces. The resonant frequencies were measured as function
of temperature from -20°C to +50°C in a programmable climatic
chamber. As a result, the ceramics presented relatively good
microwave properties: \ε 1=34.6, \τ 1=20.5 ppm/°C from
initial frequency f 1=7.23 GHz for the former composition, and
\ε 2=27.5, \τ 2=10.1ppm/°C from initial frequency f
2=7.80 GHz for the latter.",
doi = "10.4028/www.scientific.net/MSF.727-728.539",
url = "http://dx.doi.org/10.4028/www.scientific.net/MSF.727-728.539",
issn = "1662-9752",
label = "lattes: 9267837198256058 4 CastroNonoSouzMine:2012:VaReFr",
language = "pt",
urlaccessdate = "02 maio 2024"
}