La2O3掺杂SiO2-B2O3-Nb2O5复相微晶玻璃相界及储能性能研究

摘要/Abstract

摘要： 采用可控析晶法制备了La₂O₃掺杂的SiO₂-B₂O₃-Nb₂O₅ (SBN)复相微晶玻璃,利用DSC、Raman、XRD、SEM、铁电和介电性能测试等分析表征了La₂O₃掺杂对SBN复相微晶玻璃结构与储能性能的影响。结果表明:La₂O₃掺杂能够有效提高复相微晶玻璃的热稳定性,随着La₂O₃含量增加,系统析晶势垒增大,热膨胀系数先降低后升高,价键振动加剧,介电常数先增大后减小,介电损耗先减小后增大;掺杂1.00%(摩尔分数)La₂O₃时,复相微晶玻璃在40 kV/cm电场下的储能密度和储能效率最大,分别为0.031 J·cm^-3和77.6%;储能性能主要通过介电常数和击穿场强的协同作用来评价,La₂O₃能通过提高结构热稳定性和降低介电损耗来提高介电常数,当其引入体系后处于玻璃网络的空隙中,可有效增强材料耐击穿性能;复相微晶玻璃结构可以增加结构无序度,从而降低弛豫损耗,有效提高材料的储能性能。

关键词: SiO₂-B₂O₃-Nb₂O₅微晶玻璃, La₂O₃掺杂, 储能材料, 复相, 相界, 铁电材料, 析晶

Abstract: La₂O₃ doped SiO₂-B₂O₃-Nb₂O₅ (SBN) complex phase glass-ceramics were prepared by controlled crystallization method. The effects of La₂O₃ doping on structure and energy storage performance of SBN complex phase glass-ceramics were characterized by DSC, Raman, XRD, SEM, ferroelectric and dielectric tests. The results show that La₂O₃ doping can effectively improve the thermal stability of complex phase glass-ceramics. With the increase of La₂O₃ content, the crystallization barrier of the system increases, the thermal expansion coefficient decreases first and then increases,the valence bond vibration intensifies, the dielectric constant increases first and then decreases, and the dielectric loss decreases first and then increases. When doped with 1.00% (mole fraction) La₂O₃, the energy storage density and energy storage efficiency of complex phase glass-ceramics under 40 kV/cm are the highest, which are 0.031 J·cm^-3 and 77.6%, respectively. The energy storage performance is mainly evaluated by the synergistic effect of dielectric constant and breakdown field strength. La₂O₃ can improve the dielectric constant by improving structure stability and reducing dielectric loss. When La₂O₃ is introduced into the system, it is in the voids of glass network, which can effectively enhance the breakdown resistance of material. The complex phase glass-ceramic structure can increase structural disorder, thereby reducing relaxation loss and effectively improving the energy storage performance of material.

Key words: SiO₂-B₂O₃-Nb₂O₅ glass-ceramics, La₂O₃ doping, energy storage material, complex phase, phase boundary, ferroelectric material, crystallization

中图分类号:

TQ171

郭宏伟, 白赟, CHI Longxing, 赵志龙, 刘帅, 王毅, 李荣悦. La₂O₃掺杂SiO₂-B₂O₃-Nb₂O₅复相微晶玻璃相界及储能性能研究[J]. 硅酸盐通报, 2022, 41(11): 3826-3833.

GUO Hongwei, BAI Yun, CHI Longxing, ZHAO Zhilong, LIU Shuai, WANG Yi, LI Rongyue. Phase Boundary and Energy Storage Performance of La₂O₃ Doped SiO₂-B₂O₃-Nb₂O₅ Complex Phase Glass-Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(11): 3826-3833.

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La₂O₃掺杂SiO₂-B₂O₃-Nb₂O₅复相微晶玻璃相界及储能性能研究

Phase Boundary and Energy Storage Performance of La₂O₃ Doped SiO₂-B₂O₃-Nb₂O₅ Complex Phase Glass-Ceramics

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