Dielectric and piezoelectric perfomance of lead-free ceramics of boron sodium gadolinate niobate at morphotropic phase boundary

被引：2
作者：
Kunnath, Nissamuddeen [1 ,2 ]
Philip, Jacob [1 ,3 ]
机构：
[1] Cochin Univ Sci & Technol, Dept Instrumentat, Cochin 682022, Kerala, India
[2] PSMO Coll Tirurangadi, Dept Phys, Malappuram 676306, India
[3] Amal Jyothi Coll Engn, Kottayam 686518, Kerala, India
来源：
JOURNAL OF ADVANCED DIELECTRICS | 2020年 / 10卷 / 04期
关键词：
Piezoceramic nanocomposites; morphotropic phase boundary; Boron Sodium Gadolinium Niobate; lead-free ceramics; piezoelectric strain coefficient; rhombohedral-monoclinic phase boundary; FREE PIEZOCERAMICS; ORIGIN;
D O I：
10.1142/S2010135X20500149
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
New lead-free piezoceramic nanocomposites of Boron Sodium Gadolinium Niobate (BNGN), with general formula (1-x)B0.5Na0.5GdO3-xB(0.5)Na(0.5)NbO(3), exhibiting a Morphotropic Phase Boundary (MPB), have been synthesized following hydrothermal method followed by solid state sintering. The occurrence of MPB at the composition with x = 0.55, at which rhombohedral and monoclinic phases are found to coexist, has been confirmed using powder XRD. This accounts for the occurrence of large remnant polarization when the sintered ceramic pellets are subjected to electric poling at 2KV/mm. Uniform microstructure of various compositions is confirmed by SEM imaging. Dielectric and piezoelectric properties of the samples are found to be comparable to those of commercial grade PZT. At the MPB, the d(33) coefficient is found to be 556 pC/N, which is close to that of commercial grade PZT, which makes BNGN a promising material to substitute lead containing PZT in the near future.
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页数：9
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