@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 = "30 abr. 2024"
}