Lead-Free Relaxor Ferroelectric Na0.47K0.47Li0.06Nb0.94Sb0.06O3 Crystals for Optoelectronic Applications

被引：16
作者：
Ray, Geeta [1 ]
Sinha, Nidhi [1 ,2 ]
Singh, Budhendra [1 ,3 ]
Bdikin, Igor [3 ]
Kumar, Binay [1 ]
机构：
[1] Univ Delhi, Sgtb Khalsa Coll, Dept Phys & Astrophys, Crystal Lab, Delhi 7, India
[2] Univ Delhi, Sgtb Khalsa Coll, Dept Elect, Delhi 7, India
[3] Univ Aveiro, Aveiro Inst Nanotechnol, Dept Mech Engn, TEMA NRD, P-3810193 Aveiro, Portugal
来源：
CRYSTAL GROWTH & DESIGN | 2015年 / 15卷 / 04期
关键词：
SINGLE-CRYSTALS; PIEZOELECTRIC PROPERTIES; (NA0.5K0.5)NBO3-LINBO3 CERAMICS; PEROVSKITE OXIDES; FLUX GROWTH; BEHAVIOR; TEMPERATURE; PERFORMANCE; DEPENDENCE; MOLYBDATE;
D O I：
10.1021/cg501891r
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
In the present study, we found that Na0.47K0.47Li0.06Nb0.94Sb0.06O3 (NKLNS) crystals are good piezo-/pyro-/ferroelectric candidate for various electronic and optical applications. Its large single crystals (up to 9 x 8 x 4 mm(3)) were successfully grown by self-flux method. Relaxor type broad and diffused Curie phase transition with maximum dielectric constant around 355 degrees C was obtained. High values of dielectric constant, d(33) coefficient (125 pC/N), and pyroelectric coefficient (similar to 821 mu C m(-2) degrees C-1) were measured. Fatigue-free ferroelectric properties via hysteresis loops and piezoresponse force microscopy were observed. The crystals were found to show good transparency in the UV-visible region and a wide direct-energy band gap of 3.8 eV, along with sharp UV, blue, and green emissions. The crystals exhibited reverse indentation size effect with Meyers index n = 2.19. Thus, NKLNS crystals are a promising lead-free alternative for dielectric, piezo/ferroelectric, and optical applications.
引用
收藏
页码：1852 / 1860
页数：9
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