Long-period structural modulation on the global length scale as the characteristic feature of the morphotropic phase boundaries in the Na0.5Bi0.5TiO3 based lead-free piezoelectrics

2019 ◽  
Vol 164 ◽  
pp. 749-760 ◽  
Author(s):  
Gobinda Das Adhikary ◽  
Dipak Kumar Khatua ◽  
Anatoliy Senyshyn ◽  
Rajeev Ranjan
2015 ◽  
Vol 44 (10) ◽  
pp. 4440-4448 ◽  
Author(s):  
Xiang Lv ◽  
Jiagang Wu ◽  
Dingquan Xiao ◽  
Hong Tao ◽  
Yuan Yuan ◽  
...  

In this work, the KNNST-BNKZ-xyz ceramics were obtained, and the composition dependence of their phase structures and electrical properties was discussed.


2021 ◽  
Author(s):  
Min-Ku Lee ◽  
Byung-Hoon Kim ◽  
Gyoung-Ja Lee

Abstract The piezoelectric voltage constant (g33) is a material parameter critical to piezoelectric voltage-type sensors for detecting vibrations or strains. Here, we report a lead-free (K,Na)NbO3 (KNN)-based piezoelectric accelerometer with voltage sensitivity enhanced by taking advantage of a high g33. To achieve a high g33, the magnitudes of piezoelectric charge constant d33 and dielectric permittivity er of KNN were best coupled by manipulating the intrinsic polymorphic phase boundaries effectively with the help of Bi-based perovskite oxide additives. For the KNN composition that derives benefit from the combination of er and d33, the value of g33 was found to be 46.9 ´ 10-3 V·m/N, which is significantly higher than those (20 - 30 ´ 10−3 V·m/N) found in well-known polycrystalline lead-based ceramics including commercial Pb(Zr,Ti)O3 (PZT). Finally, the accelerometer sensor prototype built using the modified KNN composition demonstrated higher voltage sensitivity (183 mV/g) when measuring vibrations, showing a 29% increase against the PZT-based sensor (142 mV/g).


Langmuir ◽  
2008 ◽  
Vol 24 (16) ◽  
pp. 8991-8997 ◽  
Author(s):  
Surojit Pande ◽  
Achintya Kumar Sarkar ◽  
Mrinmoyee Basu ◽  
Subhra Jana ◽  
Arun Kumar Sinha ◽  
...  

Author(s):  
P.S. Ghosh ◽  
A. Arya ◽  
U.D. Kulkarni ◽  
G.K. Dey ◽  
S. Hata ◽  
...  
Keyword(s):  

2015 ◽  
Vol 3 (5) ◽  
pp. 1868-1874 ◽  
Author(s):  
Ting Zheng ◽  
Jiagang Wu ◽  
Dingquan Xiao ◽  
Jianguo Zhu ◽  
Xiangjian Wang ◽  
...  

The obvious conflicts between large piezoelectricity and high strain could be solved by developing new phase boundaries in potassium–sodium niobate materials.


1896 ◽  
Vol 16 ◽  
pp. 335-347
Author(s):  
B. Pharmakovsky

The past year has not been productive of any momentous discovery, excepting only the bronze statue at Delphi, which will be described more fully in its own place; but a great amount of useful work has been done in various directions, and, indeed, the great variety of what has been achieved may be regarded as the characteristic feature of the year.In Athens, the excavations in the neighbourhood of the Pnyx and the Areopagus have reached their third season. In the later months of 1894 the entire shrine which Dörpfeld identifies as that of Dionysos was laid bare, with its temple, altar, and wine-press. The archaic structure seems to have been in existence down to late Greek times, when its site was covered by a building which is identified by an inscription as the assembly house of the Iobacchi. From the different methods of construction which can be traced in the walls, it would seem that this building must have stood for a long period; the base of the altar, belonging to the earlier stage, is fairly well preserved; it consisted of a table supported on four slender columns, replaced later by four larger supports; at one side on the step are sinkings for two stelæ; Dörpfeld points out that according to Demosthenes (?) (Neaera, 76) the oath which the Gerairai had to swear at the sacred marriage of the Basilinna in the Anthesteria was inscribed on a stelè set up an expression which suits the proposed identification.


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