Strong Piezoelectricity in (1 – x)(K0.4Na0.6)(Nb0.96Sb0.04)O3-xBi0.5K0.5Zr1–ySnyO3 Lead-Free Binary System: Identification and Role of Multiphase Coexistence

2015 ◽  
Vol 7 (10) ◽  
pp. 5927-5937 ◽  
Author(s):  
Ting Zheng ◽  
Jiagang Wu ◽  
Dingquan Xiao ◽  
Jianguo Zhu ◽  
Xiangjian Wang ◽  
...  
Keyword(s):  
System Identification ◽  
Binary System ◽  
Lead Free

scholarly journals Nano-domains in lead-free piezoceramics: a review

2020 ◽  
Vol 8 (20) ◽  
pp. 10026-10073 ◽  
Author(s):  
Xiang Lv ◽  
Xi-xiang Zhang ◽  
Jiagang Wu
Keyword(s):  
Systematic Review ◽  
Lead Free ◽  
Polar Nanoregions

A systematic review summarizing and analyzing the role of recently observed nano-domains and polar nanoregions (PNRs) in lead-free piezoceramics.

scholarly journals Piezoelectric characterization of lead-free ferroelectric ceramics

2010 ◽  
Vol 4 (3) ◽  
pp. 199-207 ◽  
Author(s):  
Lorena Pardo ◽  
Alvaro García ◽  
Klaus Brebøl ◽  
Lavinia Curecheriu ◽  
Liliana Mitoseriu ◽  
...  
Keyword(s):  
Sol Gel ◽  
Complex Impedance ◽  
Experimental Spectrum ◽  
Lead Free ◽  
Ferroelectric Ceramics ◽  
Coarse Grained ◽  
Shear Mode ◽  
Fine Grained ◽  
Accuracy Test

The challenge to develop high piezoelectric sensitivity and lead-free composition ferro-piezoelectric ceramics has recently dragged new attention to some classic ferroelectrics. Here, Ba(CexTi1-x)O3 (Ce-BT) and 0.94(Bi1/2Na1/2)TiO3-0.06BaTiO3 (BNBT6) ceramics were piezoelectrically characterized from measurements of complex impedance at electromechanical resonances and their analysis by Alemany et al. software. The reconstruction of the spectra for each resonance is used as an accuracy test of the set of calculated coefficients, quantitatively characterized by the regression factor (R2) of such reconstruction to the experimental spectrum. Piezoelectric activity at room temperature (RT) was observed for Ce-BT with x=0.06 and 0.1, ferroelectrics with T(?'max)>RT, but also for x=0.2 with T(?'max)<RT, which confirms its relaxor character (Ps?0 for T?T(?'max)). BNBT6 fine grained ceramics (~1 ?m) were prepared from nanopowder obtained by sol-gel autocombustion. Results obtained for the fine grained ceramic hot-pressed at 800?C for 2 h and recrystallized at 1050?C for 1 h are d33=148 pCN-1 and kp=26.8%. Despite of its lower grain size, the properties of this material are comparable with those reported for coarse grained ceramics obtained by sintering at T>1100?C. Some measurement issues, as the role of the mode coupling on the characterization results, illustrated for the shear mode of a thickness poled plate, are discussed.

scholarly journals Role of Intermetallics in Lead-Free Alloys

2019 ◽  
Author(s):  
Dattaguru Ananthapadmanaban ◽  
Arun Vasantha Geethan
Keyword(s):  
Lead Free

The Role of Temperature on Hydration of Binary System of Metakaolin/Portland Cement

2016 ◽  
Vol 851 ◽  
pp. 51-56 ◽  
Author(s):  
Martin Boháč ◽  
Radoslav Novotný ◽  
Jakub Tkacz ◽  
Miroslava Hajdúchová ◽  
Martin Palou ◽  
...  
Keyword(s):  
Binary System ◽  
Portland Cement ◽  
Isothermal Calorimetry ◽  
Chemical Characterization ◽  
Exothermic Peak ◽  
Early Hydration ◽  
Different Temperatures ◽  
C 50

The role of temperature of metakaolin/Portland cement binary system was studied by isothermal calorimetry. Sample with 50 % of metakaolin replacement were monitored at 30 °C, 40 °C, 50 °C and 60 °C. Structural and chemical characterization of hardened pastes was obtained by scanning electron and Raman microscopy. Paper deals with kinetics of main exothermal reactions during early hydration of the system. Activation energies were calculated for processes related to each exothermic peak. The nature of hydration products at different temperatures was revealed by microstructural studies.

Toward a low cost and high performance MPC: The role of system identification

2013 ◽  
Vol 51 ◽  
pp. 124-135 ◽  
Author(s):  
Yucai Zhu ◽  
Rohit Patwardhan ◽  
Stephen B. Wagner ◽  
Jun Zhao
Keyword(s):  
System Identification ◽  
High Performance ◽  
Low Cost

Role of Stoichiometry on Ordering in Ni-Cr Alloys

2015 ◽  
Vol 1809 ◽  
pp. 7-12 ◽  
Author(s):  
Fei Teng ◽  
Julie D. Tucker
Keyword(s):  
Mechanical Property ◽  
Phase Transformation ◽  
Binary System ◽  
Nuclear Power ◽  
Experimental Methods ◽  
X Ray Diffraction ◽  
Control Rod ◽  
X Ray ◽  
Reactor Pressure

ABSTRACTMechanical property degradation due to an ordering phase transformation is a concern for alloys based on the Ni-Cr binary system (e.g., 690, 625), particularly in nuclear power applications, such as stream generator tubing, reactor pressure vessel and head control rod drive mechanism penetrations, where component lifetimes can exceed 40 years. In the present research, the disorder-order phase transformation has been studied in Ni-Cr model alloys with varying stoichiometry by experimental methods. In this paper, the effect of composition on ordering is characterized via X-ray diffraction.

scholarly journals Dramatografia

2017 ◽  
pp. 195-226
Author(s):  
Anna Krajewska
Keyword(s):  
Binary System

The article presents the concept of dramatography as being created by “writing drama”. The author treats drama as a fluid concept, historically variable, non-binary compared to theatre, establishing performative relations interwoven with other arts. Dramatography is a response to limitations resulting from the use of the concepts of adaptation, interpretation and intersemiotic translation in the former binary system in drama and theatre. Referring to Hans Ulrich Gumbrecht’s concept of “producing presence”, the author shows the role of manifesting oneself as a counterweight to meaning in the process through which dramatography emerges.

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