Development and application of ferrite materials for low temperature co-fired ceramic （LTCC） technology are dis- cussed, specifically addressing several typical ferrite materials such as M-type barium ferrite, NiCuZ...Development and application of ferrite materials for low temperature co-fired ceramic （LTCC） technology are dis- cussed, specifically addressing several typical ferrite materials such as M-type barium ferrite, NiCuZn ferrite, YIG ferrite, and lithium ferrite. In order to permit co-firing with a silver internal electrode in LTCC process, the sintering temperature of ferrite materials should be less than 950 ℃. These ferrite materials are research focuses and are applied in many ways in electronics.展开更多
Recently,large phase-change magnetoelectric response has been anticipated by a first-principles investigation of phases in the BiFeO_(3)–BiCoO_(3)perovskite binary system,associated with the existence of a discontinu...Recently,large phase-change magnetoelectric response has been anticipated by a first-principles investigation of phases in the BiFeO_(3)–BiCoO_(3)perovskite binary system,associated with the existence of a discontinuous morphotropic phase boundary(MPB)between multiferroic polymorphs of rhombohedral and tetragonal symmetries.This might be a general property of multiferroic phase instabilities,and a novel promising approach for room temperature magnetoelectricity.We review here our current inves-tigations on the identification and study of additional material systems,alternative to BiFeO_(3)–BiCoO_(3)that has only been obtained by high pressure synthesis.Three systems,whose phase diagrams were,in principle,liable to show multiferroic MPBs have been addressed:the BiMnO_(3)–PbTiO_(3)and BiFeO_(3)–PbTiO_(3)binary systems,and the BiFeO_(3)–BiMnO_(3)–PbTiO_(3)ternary one.A compre-hensive study of multiferroism across different solid solutions was carried out based on electrical and magnetic characterizations,complemented with mechanical and electromechanical measurements.An in-depth structural analysis was also accomplished when necessary.展开更多
In this work,Li_(2)O_(3)was added into 0.7BiFeO_(3)-0.3BaZr_(0.02)Ti_(0.98)O_(3)-0.01molMnO_(2)(70BFBTMn)piezoelectric ceramics to reduce their sintering temperatures.70BFBTMn ceramics were sintered by a conventional ...In this work,Li_(2)O_(3)was added into 0.7BiFeO_(3)-0.3BaZr_(0.02)Ti_(0.98)O_(3)-0.01molMnO_(2)(70BFBTMn)piezoelectric ceramics to reduce their sintering temperatures.70BFBTMn ceramics were sintered by a conventional solid reaction method,and their structural,dielectric,piezoelectric and ferroelectric properties were studied.These results indicate that 0.5%(mole)Li_(2)O_(3)is the optimized content and it can reduce the sintering temperature by 100°C,making the possibility of the piezoelectric ceramics cofiring with Ag electrodes at low temperatures to manufacture multilayer piezoelectric actuators.展开更多
基金Project supported by the National Basic Research Program of China(Grant No.2012CB933100)the National Natural Science Foundation of China(Grant Nos.51132003,61021061,and 61171047)the Second Item of Strongpoint Industry of Guangdong Province,China(Grant No.2012A090100001)
文摘Development and application of ferrite materials for low temperature co-fired ceramic （LTCC） technology are dis- cussed, specifically addressing several typical ferrite materials such as M-type barium ferrite, NiCuZn ferrite, YIG ferrite, and lithium ferrite. In order to permit co-firing with a silver internal electrode in LTCC process, the sintering temperature of ferrite materials should be less than 950 ℃. These ferrite materials are research focuses and are applied in many ways in electronics.
基金Spanish MINECO through the MAT2014-58816-R and MAT2011-2370projects.C.M.F-P.also acknowledges the financial aid of the Spanish FPI Program(BES 2012-053017).
文摘Recently,large phase-change magnetoelectric response has been anticipated by a first-principles investigation of phases in the BiFeO_(3)–BiCoO_(3)perovskite binary system,associated with the existence of a discontinuous morphotropic phase boundary(MPB)between multiferroic polymorphs of rhombohedral and tetragonal symmetries.This might be a general property of multiferroic phase instabilities,and a novel promising approach for room temperature magnetoelectricity.We review here our current inves-tigations on the identification and study of additional material systems,alternative to BiFeO_(3)–BiCoO_(3)that has only been obtained by high pressure synthesis.Three systems,whose phase diagrams were,in principle,liable to show multiferroic MPBs have been addressed:the BiMnO_(3)–PbTiO_(3)and BiFeO_(3)–PbTiO_(3)binary systems,and the BiFeO_(3)–BiMnO_(3)–PbTiO_(3)ternary one.A compre-hensive study of multiferroism across different solid solutions was carried out based on electrical and magnetic characterizations,complemented with mechanical and electromechanical measurements.An in-depth structural analysis was also accomplished when necessary.
基金supported by the National Natural Science Foundation of China(Grant Nos.11704242,51872180 and 51672169)the Natural Science Foundation of Shanghai,China(Grant Nos.17ZR1447200 and 18ZR1414800).
文摘In this work,Li_(2)O_(3)was added into 0.7BiFeO_(3)-0.3BaZr_(0.02)Ti_(0.98)O_(3)-0.01molMnO_(2)(70BFBTMn)piezoelectric ceramics to reduce their sintering temperatures.70BFBTMn ceramics were sintered by a conventional solid reaction method,and their structural,dielectric,piezoelectric and ferroelectric properties were studied.These results indicate that 0.5%(mole)Li_(2)O_(3)is the optimized content and it can reduce the sintering temperature by 100°C,making the possibility of the piezoelectric ceramics cofiring with Ag electrodes at low temperatures to manufacture multilayer piezoelectric actuators.
