Effective piezoelectric properties,electromechanical coupling factors(ECF)and figures of merit(FOM)are studied in leadfree 0-3-type composites based on novel ferroelectric 0.965(K_(0.48)Na_(0.52))(Nb_(0.96)Sb_(0.04))O...Effective piezoelectric properties,electromechanical coupling factors(ECF)and figures of merit(FOM)are studied in leadfree 0-3-type composites based on novel ferroelectric 0.965(K_(0.48)Na_(0.52))(Nb_(0.96)Sb_(0.04))O_(3)-0.035Bi_(0.5)Na_(0.5)Zr_(0.15)Hf_(0.75)O_(3) ceramic.Systems of prolate ceramic inclusions are surrounded by a large polymer matrix that can be either monolithic(in the 0-3 composite)or porous(in the 0-3-0 composite).Non-monotonic volume-fraction dependences of the effective piezoelectric coefficients g_(3j)^(*),ECF k_(3j)^(*),squared FOM d_(3j)^(*)g_(3j)^(*)and their modified analogs for stress-driven systems are analysed,and examples of the high longitudinal piezoelectric sensitivity(g33^(*)>100 mV.m/N)are considered.A role of microgeometrical factors,that promote the large effective parameters and anisotropy of properties in the 0-3-type composites,is highlighted.New“aspect ratio-volume fraction”diagrams are first built to describe conditions for high piezoelectric sensitivity,large modified FOM and their anisotropy in the studied composites.These advanced materials can be of value for piezoelectric sensor,energy-harvesting and related applications.展开更多
Piezoelectric properties and related figures of merit are studied in novel 1-3-type composites based on ferroelectric domain-engineered lead-free single crystal with the relatively large longitudinal piezoelectric coe...Piezoelectric properties and related figures of merit are studied in novel 1-3-type composites based on ferroelectric domain-engineered lead-free single crystal with the relatively large longitudinal piezoelectric coefficient d_(33).Relationships between the piezoelectric properties and the set of figures of merit are analyzed for the 1-3 and 1-3-0 composites that contain the same single-crystal and polymer components.For a composite characterized by 1-3-0 connectivity,an influence of a porous piezo-passive matrix on the figures of merit and their volume-fraction behavior is considered additionally.A large anisotropy of figures of merit is observed in the 1-3-0 composite with specific porous matrices.A diagram is put forward to show volume-fraction regions of the large anisotropy of figures of merit of the studied 1-3-0 composite.Due to large figures of merit and their considerable anisotropy,the studied lead-free composites can be applied in piezoelectric energy-harvesting systems,sensors,transducers,and so on.展开更多
In the present work,piezoelectric composite films made of Polyaniline(PAni)coated Lead Zirconate Titanate(PZT)particles immersed into polyvinylidene fluoride(PVDF)matrix were characterized by mechanical tests,and the ...In the present work,piezoelectric composite films made of Polyaniline(PAni)coated Lead Zirconate Titanate(PZT)particles immersed into polyvinylidene fluoride(PVDF)matrix were characterized by mechanical tests,and the connectivity of the com-posite sample was determined using dielectric measurements and applying the Poon–Shin model.The composite was considered a binary system with coated PZT particles as one phase and the polymer matrix the other one.To support the result obtained from theoretical analysis,scanning electron microscopy of the composites were done.It was observed a decrease up to 85%on the mechanical resistance when the ceramic volume fraction increases from 0%to 40%.Furthermore,the composite film no longer can be considered with 0–3 connectivity when the ceramic content is 30 vol.%or over.展开更多
文摘Effective piezoelectric properties,electromechanical coupling factors(ECF)and figures of merit(FOM)are studied in leadfree 0-3-type composites based on novel ferroelectric 0.965(K_(0.48)Na_(0.52))(Nb_(0.96)Sb_(0.04))O_(3)-0.035Bi_(0.5)Na_(0.5)Zr_(0.15)Hf_(0.75)O_(3) ceramic.Systems of prolate ceramic inclusions are surrounded by a large polymer matrix that can be either monolithic(in the 0-3 composite)or porous(in the 0-3-0 composite).Non-monotonic volume-fraction dependences of the effective piezoelectric coefficients g_(3j)^(*),ECF k_(3j)^(*),squared FOM d_(3j)^(*)g_(3j)^(*)and their modified analogs for stress-driven systems are analysed,and examples of the high longitudinal piezoelectric sensitivity(g33^(*)>100 mV.m/N)are considered.A role of microgeometrical factors,that promote the large effective parameters and anisotropy of properties in the 0-3-type composites,is highlighted.New“aspect ratio-volume fraction”diagrams are first built to describe conditions for high piezoelectric sensitivity,large modified FOM and their anisotropy in the studied composites.These advanced materials can be of value for piezoelectric sensor,energy-harvesting and related applications.
基金The authors are grateful to Prof.Dr.I.A.Parinov and Prof.Dr.A.E.Panich(Southern Federal University,Russia),and Prof.Dr.C.R.Bowen(University of Bath,UK)for their interest in the field of modern piezo-active materials and applications.Research was financially supported by Southern Federal University,grant No.VnGr-07/2020-04-IM(Ministry of Science and Higher Education of the Russian Federation).
文摘Piezoelectric properties and related figures of merit are studied in novel 1-3-type composites based on ferroelectric domain-engineered lead-free single crystal with the relatively large longitudinal piezoelectric coefficient d_(33).Relationships between the piezoelectric properties and the set of figures of merit are analyzed for the 1-3 and 1-3-0 composites that contain the same single-crystal and polymer components.For a composite characterized by 1-3-0 connectivity,an influence of a porous piezo-passive matrix on the figures of merit and their volume-fraction behavior is considered additionally.A large anisotropy of figures of merit is observed in the 1-3-0 composite with specific porous matrices.A diagram is put forward to show volume-fraction regions of the large anisotropy of figures of merit of the studied 1-3-0 composite.Due to large figures of merit and their considerable anisotropy,the studied lead-free composites can be applied in piezoelectric energy-harvesting systems,sensors,transducers,and so on.
文摘In the present work,piezoelectric composite films made of Polyaniline(PAni)coated Lead Zirconate Titanate(PZT)particles immersed into polyvinylidene fluoride(PVDF)matrix were characterized by mechanical tests,and the connectivity of the com-posite sample was determined using dielectric measurements and applying the Poon–Shin model.The composite was considered a binary system with coated PZT particles as one phase and the polymer matrix the other one.To support the result obtained from theoretical analysis,scanning electron microscopy of the composites were done.It was observed a decrease up to 85%on the mechanical resistance when the ceramic volume fraction increases from 0%to 40%.Furthermore,the composite film no longer can be considered with 0–3 connectivity when the ceramic content is 30 vol.%or over.
