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您的检索式：作者名="Andrew J.Bell"
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| 1 | Requirements for the transfer of lead-free piezoceramics into application显示文摘The recent review for the Restriction of Hazardous Substances Directive(RoHS)by the expert committee,appointed by the European Union,stated that the replacement of PZT“…may be scientifically and technologically practical to a certain degree…”,although replacement“…is scientifically and technically still impractical in the majority of applications.”Thus,two decades of sustained research and development may be approaching fruition,at first limited to a minority of applications.Therefore,it is of paramount importance to assess the viability of lead-free piezoceramics over a broad range of application-relevant properties.These are identified and discussed in turn:1.Cost,2.Reproducibility,3.Mechanical and Thermal Properties,4.Electrical Conductivity,and 5.Lifetime.It is suggested that the worldwide efforts into the development of lead-free piezoceramics now require a broader perspective to bring the work to the next stage of development by supporting implementation into real devices.Guidelines about pertinent research requirements into a wide range of secondary properties,measurement techniques,and salient literature are provided. | Jurij Koruza Andrew J.Bell Till Fromling Kyle G.Webber Ke Wang Jürgen Rodel | 2018 | Journal of Materiomics2018，4，1： | 14 |
| 2 | An equivalent dipole analysis of PZT ceramics and lead-free piezoelectric single crystals显示文摘The recently proposed Equivalent Dipole Model for describing the electromechanical properties of ionic solids in terms of 3 ions and 2 bonds has been applied to PZT ceramics and lead-free single crystal piezoelectric materials,providing analysis in terms of an effective ionic charge and the asymmetry of the interatomic force constants.For PZT it is shown that,as a function of composition across the morphotropic phase boundary,the dominant bond compliance peaks at 52%ZrO_(2).The stiffer of the two bonds shows little composition dependence with no anomaly at the phase boundary.The effective charge has a maximum value at 50%ZrO_(2),decreasing across the phase boundary region,but becoming constant in the rhombohedral phase.The single crystals confirm that both the asymmetry in the force constants and the magnitude of effective charge are equally important in determining the values of the piezoelectric charge coefficient and the electromechanical coupling coefficient.Both are apparently temperature dependent,increasing markedly on approaching the Curie temperature. | Andrew J.Bell | 2016 | Journal of Advanced Dielectrics2016，6，2： | 0 |
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