La(Nb_(0.9)V0.1)O_(4)has been shown by in situ Raman spectroscopy and X-ray diffraction to undergo a ferroelastic phase transition from monoclinic fergusonite to tetragonal scheelite(T_(M–T))at 350°C,accompanied...La(Nb_(0.9)V0.1)O_(4)has been shown by in situ Raman spectroscopy and X-ray diffraction to undergo a ferroelastic phase transition from monoclinic fergusonite to tetragonal scheelite(T_(M–T))at 350°C,accompanied by 3.55%spontaneous strain and an abrupt change in the thermal expansion coefficient(α_(L))from+15.5 ppm°C^(−1)to+11._(4)ppm°C^(−1).展开更多
Lead-based electroceramics such as Pb(Zr.Ti)O_(3)(PZT)and its derivatives have excellent piezoelectric,pyroelectric and energy storage properties and can be used in a wide range of applications.Potential lead-free rep...Lead-based electroceramics such as Pb(Zr.Ti)O_(3)(PZT)and its derivatives have excellent piezoelectric,pyroelectric and energy storage properties and can be used in a wide range of applications.Potential lead-free replacements for PZT such as potassium sodium niobate(KNN)and sodium bismuth titanate(NBT)have a much more limited range of useful properties and have been optimized primarily for piezoelectric applications.Here,we review the initial results on a new generation of lead-free electroceramics based on BiFeO_(3)-BaTiO_(3)(BF-BT)highlighting the essential crystal chemistry that permits a wide range of functional properties.We demonstrate that with the appropriate dopants and heat treatment,BF-BT can be used to fabricate commercially viable ceramics for applications,ranging from sensors,multilayer actuators,capacitors and high-density energy storage devices.We also assess the potential of BF-BT-based ceramics for electrocaloric and pyroelectric applications.展开更多
基金supported by the National Key Research and Development Program of China(Grant 2017YFB0406301)the Sustainability and Substitution of Functional Materials and Devices EPSRC(EP/L017s563/1)+2 种基金the National Natural Science Foundation of China(51972260,52072295)the State Key Laboratory of Electrical Insulation and Power Equipment(Grant EIPE19210)the Fundamental Research Funds for the Central University,and the 111 Project of China(B14040).
文摘La(Nb_(0.9)V0.1)O_(4)has been shown by in situ Raman spectroscopy and X-ray diffraction to undergo a ferroelastic phase transition from monoclinic fergusonite to tetragonal scheelite(T_(M–T))at 350°C,accompanied by 3.55%spontaneous strain and an abrupt change in the thermal expansion coefficient(α_(L))from+15.5 ppm°C^(−1)to+11._(4)ppm°C^(−1).
基金supported by the Engineering and Physical Sciences Research Council(EP/L017563/1 and EP/N010493/1)and National Natural Science Foundation of China(51602060 and 51402005).D.Wang,G.Wang and S.Murakami contributed equally to this work and should be considered as co-first authors.
文摘Lead-based electroceramics such as Pb(Zr.Ti)O_(3)(PZT)and its derivatives have excellent piezoelectric,pyroelectric and energy storage properties and can be used in a wide range of applications.Potential lead-free replacements for PZT such as potassium sodium niobate(KNN)and sodium bismuth titanate(NBT)have a much more limited range of useful properties and have been optimized primarily for piezoelectric applications.Here,we review the initial results on a new generation of lead-free electroceramics based on BiFeO_(3)-BaTiO_(3)(BF-BT)highlighting the essential crystal chemistry that permits a wide range of functional properties.We demonstrate that with the appropriate dopants and heat treatment,BF-BT can be used to fabricate commercially viable ceramics for applications,ranging from sensors,multilayer actuators,capacitors and high-density energy storage devices.We also assess the potential of BF-BT-based ceramics for electrocaloric and pyroelectric applications.
