Sol-gel derived Bi2NiNb2O9 pyrochlore: Synthesis, characterization and dielectric properties

被引:0
作者
Zhuk, N. A. [1 ]
Badanina, K. A. [1 ]
Korolev, R. I. [1 ]
Krzhizhanovskaya, M. G. [2 ]
Sekushin, N. A. [3 ]
Belyy, V. A. [3 ]
Makeev, B. A. [4 ]
机构
[1] Syktyvkar State Univ, Tversky prospect 55, Syktyvkar 167001, Russia
[2] St Petersburg State Univ, Univ Emb 7-9, St Petersburg 199034, Russia
[3] RAS, Inst Chem, Komi Sci Ctr UB, Pervomaiskaya st 48, Syktyvkar 167982, Russia
[4] RAS, Inst Geol, Komi Sci Ctr UB, Pervomaiskaya st 54, Syktyvkar 167982, Russia
关键词
Ceramics; Sol-gel synthesis; Pyrochlore; Bismuth niobate; Dielectric properties; CRYSTAL-CHEMISTRY; PHASE-FORMATION; SYSTEM; NI; MG; ELECTROLYTES; RELAXATION;
D O I
10.1016/j.ceramint.2024.09.385
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
The Pechini method was used for the first time to synthesize the phase-pure nickel-containing cubic pyrochlore Bi2NiNb2O9 (space group Fd-3m, a = 10.5371(5) angstrom), while the solid-phase reaction method provided no possibility to obtain impurities-free pyrochlore. At a synthesis temperature of 950 degrees C, low-porosity ceramics with indistinct grain boundaries were formed. The results of elemental mapping indicated a uniform distribution of metal atoms on the surface of the sample. The X-ray energy dispersive analysis showed that the chemical composition of the synthesized sample corresponded to the predetermined theoretical composition. The calcination of the sample synthesized by the Pechini method was studied by the thermal analysis up to 1100 degrees C. The functional composition of intermediate synthesis products was analyzed by vibrational spectroscopy (FTIR). In the FTIR spectrum of pyrochlore (4000-400 cm-1), absorption bands were identified at 829, 540, 654, and 490 cm-1. The dielectric properties of the pyrochlore were studied using an impedance spectroscopy. Pyrochlore Bi2NiNb2O9 has the high relative dielectric permittivity of 145 and low dielectric losses of 0.001 (at 24 degrees C, 1 MHz), which make it a promising for dielectric in multilayer ceramic capacitors.
引用
收藏
页码:50397 / 50409
页数:13
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