Results 61 to 70 of about 477 (182)

Evaluation of rare earth oxides doping SnO2.(Co1/4,Mn3/4)O-based varistor system

Materials Research, 2006
The present paper aims to verify the inuence of rare earth oxide such as lanthanum (La2O3) and neodymium (Nd2O3) doping SnO2 + 0.25%CoO + 0.75%MnO2 + 0.05%Ta2O5 system.
Alessandro Dibb, Mario Cilense, Paulo Roberto Bueno, Yves Maniette, José Arana Varela, Elson Longo   +5 more
doaj   +1 more source

Control strategy of novel hybrid commutated converter based on reverse blocking integrated gate commutated thyristor for commutation failure mitigation

High Voltage, Volume 10, Issue 3, Page 546-554, June 2025.
Abstract Commutation failure (CF) is an inherent problem faced by line commutated converter high voltage direct current (LCC‐HVDC) technology. To completely solve the problem of CF, we have proposed a novel hybrid commutated converter (HCC) technology based on reverse blocking integrated gate commutated thyristor, which can utilise two methods for ...
Zongze Wang, Zhanqing Yu, Lu Qu, Zhichang Yuan, Kangsheng Cui, Jian Shi, Biao Zhao, Rong Zeng   +7 more
wiley   +1 more source

Electronic ceramics based on polycrystalline SnO2, TiO2 and (Sn xTi1-x)O2 solid solution

Materials Research, 2006
In the present text we discuss on electronic properties arising from polycrystalline semiconductor ceramics of SnO2, TiO2 and (Sn xTi1-x)O2 solid solution rutile-type structure.
Paulo Roberto Bueno, José Arana Varela
doaj   +1 more source

Estudo da adsorção de dispersante à base de poliacrilato em um sistema varistor comercial: caracterização físico-química Study of polyacrylate adsorption in a commercial varistor system: characterization of the physical-chemistry properties

Cerâmica, 2005
Um dos grandes desafios no processamento cerâmico é a obtenção de dispersões de partículas estáveis e homogêneas contendo materiais com diferentes características físicas e químicas, como densidade, área de superfície específica, distribuição de tamanho ...
S. L. M. Brito, D. Gouvêa, R. Ganzella
doaj   +1 more source

Engenharia de microestrutura em varistor à base de ZnO: evidências de homogeneidade e correlação com reações químicas Microstructure engineering in the ZnO based varistor: evidence of homogeneity and correlation with chemical reactions

Cerâmica, 2005
A influência de reações químicas específicas sobre o desenvolvimento microestrutural em varistores à base de ZnO é abordada a partir de um enfoque inovador.
M. A. L. Nobre, A. N. C. Dias, A. M. O. A. Balan, S. Lanfredi   +3 more
doaj   +1 more source

Nonohmic behavior of SnO2.MnO2-based ceramics

Materials Research, 2003
The present paper describes the nonohmic behavior of the SnO2.MnO-based system and analyzes the influence of the sintering time and the Nb2O5 concentration on this system's electrical properties.
Marcelo O. Orlandi, Paulo Roberto Bueno, Edson Roberto Leite, Elson Longo   +3 more
doaj   +1 more source

Diffusion of the 65Zn radiotracer in ZnO polycrystalline ceramics

Materials Research, 2003
Zinc self-diffusion coefficients were measured in polycrystalline ZnO of high density (>99% of the theoretical density) and of high purity (> 99.999%).
Maria Auxiliadora das Neves Nogueira, Wilmar Barbosa Ferraz, Antônio Claret Soares Sabioni   +2 more
doaj   +1 more source

Kinetics deformation of current-voltage characteristics of the varistor oxide structures due to overcharging of the localized states

Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2014
Prolonged exposure of zinc oxide varistors to the electrical load leads to current-voltage characteristics (CVC) deformation, which is associated with a change in the height and width of the intergranular barriers, which are the main structural element ...
A. S. Tonkoshkur, A. V. Ivanchenko
doaj   +1 more source

Cold-Sintered ZnO Ceramic Composites Co-Doped with Polytetrafluoroethylene and Oxides. [PDF]

Molecules, 2023
Xiao Y, Yang Y, Kang S, Li Y, Hou X, Ren C, Wang X, Zhao X.   +7 more
europepmc   +1 more source

Electrical characterization by impedance spectroscopy of Zn7Sb2O12 ceramic

Materials Research, 2003
Impedance spectroscopy technique was used to investigate the electric properties of Zn7Sb2O12, an electroceramic with inverse spinel type structure. The electric characterization of the Zn7Sb2O12 semiconducting ceramic was performed at temperature from ...
Nobre Marcos A. de Lima, Lanfredi Silvania   +1 more
doaj