NEW MULTIFUNCTIONAL CERAMICS: ELABORATION, CHARACTERIZATIONS AND APPLICATIONS

1. NEW MULTIFUNCTIONAL CERAMICS: ELABORATION, CHARACTERIZATIONS AND APPLICATIONS University of Science and Technology Houari Boumediene (USTHB) Taïbi – Benziada Aldjia – Laldja (http://perso.usthb.dz/~lbenziada) 102 Hz 102 Hz 102 Hz 5x102 Hz 5x102 Hz 5x102 Hz 103 Hz 103 Hz 103 Hz 5x103 Hz 5x103 Hz 5x103 Hz 104 Hz 104 Hz 104 Hz 5x104 Hz 5x104 Hz 5x104 Hz 105 Hz 105 Hz 105 Hz 2x105 Hz 2x105 Hz 2x105 Hz SAMPLES PREPARATION MICROSTRUCTURES INTRODUCTION ACO3+TiO2 INTEREST FOR MATERIALS  = 21.9 %  = 13.5 % Grinding, Calcination Materials have always represented an essential aspect of Human Society but, nowadays, the Material became synonymous with Existence for anyIndustry. For example, in New Technologies of Information and Communication (NTIC), the Progress and Success are closely linked to the development of Advanced Ceramics with higher and higher performances but also with lowerand lower factory cost to be competitive on the huge market of microelectronics . ATiO3 + CO2 x MF2 + x LiF CaTi0.95Li0.05O2.85F0.15 Ba0.95Ca0.05Ti0.95Li0.05O2.85F0.15 Grinding, Pressing (108 Pa)  = 18.7 %  = 16.9 % Sintering (900 °C or 1000 °C , 1 or 2 h) ABO3 RELATED MATERIALS Among the new engineering ceramics, ABO3 perovskites share several properties like piezoelectricity, pyroelectricity and ferroelectricity that make them very attractive for Microelectronic Industry. Moreover, with the devices miniaturization, ATiO3(A = Ca, Sr, Ba) ceramics became key materialsfor the development of smart systemswith artificial intelligence. Up to now, the varied PZT have dominated the market of microelectronic components. However, thetoxicity of Pbis a serious threat to human healthand environment. Therefore, extensive research is actually oriented toward the development of green materials. A1-xMx(Ti1-xLix )O3-3x F3x Sr0.95Ca0.05Ti0.95Li0.05O2.85F0.15 Ba0.97Pb003Ti0.97Li0.03O2.91F0.09 CaTi0.95Li0.05O2.85F0.15 ceramic Ba0.97Pb0.03Ti0.97Li0.03O2.91F0.09 ceramic DIELECTRIC PROPERTIES APPLICATIONS OF PEROVSKITES Sr0.95Ca0.05Ti0.95Li0.05O2.85F0.15 ceramic • Among the various applications of ABO3materials we can cite as examples: • Capacitors • Sensors • Resonators • Piezoelectric actuators • Pyroelectric infrared detectors • Electro-optical modulators • Computer memories... ε'r ε"r Ba0.95Ca0.05Ti0.95Li0.05O2.85F0.15 ceramic ε'r 4000 3000 2000 1000 ε"r 0 5 8 6 7 DRAMs log10f (Hz) FRAMs HDD CONCLUSIONS • Bulk ceramics A1-xMxTi1-xLixO3-3xF3x(A = Ca, Sr or Ba) have been sintered at low temperature thanks to the admixture MF2 (M= Ca or Pb) and LiF fluorides. • The oxifluorides deriving from CaTiO3are promising materials to manufacture class I capacitors and resonators for microwave circuits. • (Sr,M)(Ti,Li)(O,F)3ceramics could be used in piezoelectric devices and are potential candidates for the fabrication of type I capacitors. • The ceramics related to BaTiO3 could be of interest for Z5U multilayer capacitors or as filters for electromagnetic waves in various devices. • Moreover, all these fluorinated materials could be used as photocatalysts in H2O decomposition to get clean energy. T. Shiosaki, The recent progress in the research and development for ferroelectric memory in Japan (1997) CERAMIC PRODUCTS ε'r ε"r 102 Hz 5x102 Hz 103 Hz 5x103 Hz 104 Hz 5x104 Hz 105 Hz 2x105 Hz T (K) T (K) Agence Thématique de Recherche en Sciences et Technologie (ATRST) Avenue Pasteur, ENSA ex INA Belfort, B.P 62 – Hacene Badi, El-Harrach, Alger Tél : 021 52 68 01 / 02 – Fax : 021 52 62 40 – E-mail : Contacts@atrst.dz http://www.atrst.dz