Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 765, Issue -, Pages 75-81Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.06.174
Keywords
Diopside; Glass-ceramic; Reducing-atmosphere resistance; Donor; Acceptor
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Funding
- Ministry of Science and Technology of Taiwan [MOST106-2218-E-131-002, MOST105-2221-E-131-006, MOST106-2221-E-146-003]
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This work highlights a reducing-atmosphere resistance using amphoteric ion doping to reduce defects and to enhance microwave dielectric properties in CaMgSi2O6 glass-ceramics. Amphoteric Al3+ ion (Al2O3 doping) was selected with both donor and acceptor roles to restrict free electrons and oxygen vacancies in specimens sintered in reducing atmosphere. The X-ray absorption and X-ray photoelectron spectra indicate decreased oxygen vacancies and a valence shift from a mixture of Si2+ and Si3+ to Si4+ in the Al3+-doped CaMgSi2O6 glass-ceramics sintered in reducing-atmosphere. The amphoteric Al3+ ion plays an acceptor role as entering Si4+ site to form oxygen vacancies, meanwhile Al3+ plays a donor role as entering Mg2+ site to compensate free electrons. The amphoteric Al-doped diopside glass-ceramic can increase the electric resistivity and quality factors. This work can provide an efficient approach for the base-metal-electrode (BME) in low-temperature co-fired ceramics (LTCC) and multilayer ceramic capacitors (MLCC). (C) 2018 Published by Elsevier B.V.
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