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Dielectric Tunability, Expanding the Function of Metal‐Organic Frameworks (Phys. Status Solidi RRL 6/2018)
Author(s) -
Guo JiangBin,
Chen LiHong,
Ke Hao,
Wang Xuan,
Zhao HaiXia,
Long LaSheng,
Zheng LanSun
Publication year - 2018
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201870318
Subject(s) - dielectric , materials science , ferroelectricity , electric field , optoelectronics , microwave , nanotechnology , telecommunications , physics , quantum mechanics , computer science
Dielectric tunability has potential applications in electrically tunable microwave devices, such as voltage‐controlled oscillators, band pass filters, phase shifters. Although dielectric tunability has been reported in inorganic oxides, it has never been observed in metal‐organic frameworks (MOFs). The obstacle to MOFs acting as electric‐field dielectric tunability materials is attributed to that, (i) the dielectric tunability in MOFs often occurs at the temperature far below room‐temperature, due to the ferroelectric phase in the MOFs often occurring at low temperature (often less than 200 K); (ii) a high dielectric tunability in the MOFs‐based conventional ferroelectric materials often requires a large d.c. electric field (about 10 to 100 kV∙cm −1 ). As a result, the application of the MOFs in dielectric tunability is greatly limited. Jiang‐Bin Guo et al. (article no. 1700425 ) have observed a large aboveroom‐ temperature dielectric tunability under a small d.c. bias electric field in the niccolite‐type formate frameworks for the first time, and the electron hopping between two adjacent metal ions and magnetic exchange interaction play a key role in their dielectric tunability. The present work not only provides a new route for the design of dielectric tunability materials, but also expands the function of MOFs.