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Mechanism study of the Mn‐substituted magnesium borate: Decreased sintering temperature and improved dielectric property
Author(s) -
Peng Rui,
Lu Yongcheng,
Li Yuanxun,
Su Hua,
Shi Liang,
Yu Guoliang,
Lai Yuanming,
Zhao Qiang,
Shi Xiaolei,
Zhang Huaiwu
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17875
Subject(s) - sintering , manganese , dielectric , materials science , crystallite , microstructure , magnesium , differential thermal analysis , scanning electron microscope , mineralogy , analytical chemistry (journal) , diffraction , composite material , metallurgy , chemistry , organic chemistry , optics , physics , optoelectronics
The influence of manganese substitution on the sintering and dielectric properties of Mg 3 B 2 O 6 (MBO) was studied, and the detailed mechanism of variation was discussed using density functional theory calculations. The characterization method involved a network analyser, differential–thermal analyses, thermomechanical analyses, X‐ray diffraction, and scanning electron microscopy. Manganese substitution formed a two‐phase system (MBO and Mg 2 B 2 O 5 ), improved the dielectric property, densified the microstructure, lowered the activation energy, decreased the crystallite size, modified the band structure property, and strengthened the covalency of MgO 6 octahedron. The 7% mole substitution of manganese to magnesium improved the dielectric properties of MBO to 7.06 for ε r and 61 100 GHz at 15 GHz for Q × f , −54.8 ppm/°C for τ f . The intrinsic densification temperature decreased from 1350 to 1175°C with 97.7% relative density.