Article
Physics, Multidisciplinary
Liu Rong-Zhao, Fan Zhen-Jun, Wang Hao-Cheng, Ning Hao-Ming, Mi Zhen-Yu, Liu Guang-Yao, Song Xiao-Hui
Summary: Zn doped Co-based metal organic framework single-crystal samples are synthesized, and it is found that Zn ions are uniformly doped into Co-based MOFs crystals. The magnetic experiments show that the antiferromagnetic phase transition temperature of Co-based MOFs decreases with the increasing doping of Zn ions. A series of steps on the hysteresis loop of DMCo0.9Zn0.1F sample is observed, which gradually disappears with the increase of temperature, similar to the quantum tunneling phenomenon of a single molecule magnet.
ACTA PHYSICA SINICA
(2023)
Article
Chemistry, Physical
Zhiying Zhang, Hongliang Yu, Xin Shen, Lei Sun, Shumin Yue, Hao Tang
Summary: Elastic properties are crucial mechanical properties that depend on the structure, with the coupling of ferroelasticity with ferroelectricity and ferromagnetism playing a vital role in the development of multiferroic metal-organic frameworks (MOFs). Studying [NH4][Mg(HCOO)(3)] and [(CH3)(2)NH2][Mg(HCOO)(3)] revealed a coupling between elastic anomalies and energy loss with ferroelectric and structural phase transitions.
Article
Chemistry, Physical
Zhiying Zhang, Xin Shen, Hongliang Yu, Xiaoming Wang, Lei Sun, Shumin Yue, Dongpeng Cheng, Hao Tang
Summary: The study investigated the elastic properties and energy dissipation of ferroelectric transition in [(CH3)(2)NH2][Fe(HCOO)(3)] using DSC, XRD, and DMA. The results showed a transition near 164 K, a structural transition, and elastic anomalies and energy dissipation near the ferroelectric transition temperature.
Article
Chemistry, Physical
Sanath K. Ramakrishna, Krishnendu Kundu, Jasleen K. Bindra, Steven A. Locicero, Daniel R. Talham, Arneil P. Reyes, Riqiang Fu, Naresh S. Dalal
Summary: The study used high-resolution solid-state NMR to investigate the mechanism of dielectric phase transition in a metal-organic framework material with a DMA(+) cation, revealing characteristics of both order-disorder and displacive features during the phase transition. The Mg-25 NMR spectra showed changes in line width with the dynamics of the DMA(+) cation, but no changes in chemical shift, indicating a constant local environment.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Tianyu Liu, Yuan Yuan, Xiaofan Sun, Zheng Tang, Hongling Cai, Fan Zhang, Yu Lu, Ruobai Liu, Jiarui Chen, Linao Huang, Lujun Wei, Yong Hu, Wei Zhang, Biao You, Qingyu Xu, Jun Du
Summary: In this study, an intriguing exchange bias effect in Mn-doped metal-organic framework is reported, where the bias changes from positive to negative with increasing cooling field. By finely tuning the exchange interactions between magnetic ions, the exchange bias can be controlled, which is beneficial for designing novel magnetic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Physics, Multidisciplinary
Zhenjun Fan, Rongzhao Liu, Qingying Wang, Xiangyu Wu, Zhenyu Mi, Guangyao Liu, Xiaohui Song
Summary: In this study, Mg-doped metal-organic frameworks (MOFs) single crystals were synthesized, and the effects of Mg ion doping on the magnetic properties of MOFs were investigated. The results showed that Mg ion is uniformly doped into the Co-based MOFs crystal, leading to a decrease in the antiferromagnetic phase transition temperature and the emergence of abnormal magnetic hysteresis behavior.
Article
Nanoscience & Nanotechnology
Komalavalli Thirunavukkuarasu, Rachael Richardson, Zhengguang Lu, Dmitry Smirnov, Nan Huang, Nicholas Combs, Ganesh Pokharel, David Mandrus
Summary: In this study, magneto-Raman spectroscopic investigations were conducted on a metal-organic framework compound belonging to the metal-formate family. The results showed that the formate bending mode shifted to higher energies with increasing magnetic field, and anomalies in the magneto-response of the phonon were observed at specific magnetic fields corresponding to magnetic phase transitions. These findings suggest that the formate bending mode plays a role in facilitating the saturation of magnetic states similar to its Mn and Ni analogs.
Article
Materials Science, Multidisciplinary
Rebecca Scatena, Michal Andrzejewski, Roger D. Johnson, Piero Macchi
Summary: The study demonstrates a pressure-induced orbital reordering phase transition in [(CH3)(2)NH2]Cu(HCOO)(3) above 5.20 GPa, driven primarily by unconventional octahedral tilts and shifts in the framework. This transition differs from previously reported Jahn-Teller switching in coordination polymers, and may lead to undiscovered orbital reorientation phenomena in this family of materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
Hoai Thuong Nguyen
Summary: A composite material consisting of a ferroelectric metal-organic framework and nanocellulose at various cellulose concentrations was synthesized to study the changes in phase transition and ferroelectric switching over time. The results showed that increasing the cellulose content led to higher phase transition temperature and increased coercive field. After 288 hours, the phase transition decreased significantly and the coercive field decreased. The interaction between the ferroelectric part and cellulose weakened over time, leading to the observed phenomena.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Materials Science, Multidisciplinary
Kun Liu, Xiaozhong Huang, Wei Yang, Peisheng Wang, Honghui Xu
Summary: The phase equilibria of the Fe-Mn-Zn system at 600°C were investigated, and the ε phase and three new ternary compounds were discovered.
Article
Chemistry, Physical
Houjian Zhou, Hao Ding, Xin Gao, Zhiwei Shen, Kun Zhai, Bochong Wang, Congpu Mu, Fusheng Wen, Jianyong Xiang, Tianyu Xue, Yu Shu, Lin Wang, Zhongyuan Liu
Summary: This study investigates the spin-driven magnetoelectric effects of the perovskite-like metal-organic framework [CH3NH3][Co(HCOO)(3)]. The magnetic properties and crystal structure of [CH3NH3][Co(HCOO)(3)] under high pressure are studied. It is found that high pressure can alter the crystal structure and magnetic properties of perovskite type MOF materials.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Vikas Malik, Sarmistha Maity, Ratnamala Chatterjee
Summary: We demonstrate the nonlinear resistance behavior of multiferroic MOF (CH3)2NH2Fe(HCOO)3 crystals with a high peak to valley ratio. The phase pure millimeter-sized crystals were grown using a hydrothermal process. Magnetic and dielectric measurements confirmed the multiferrioc conduction of the crystals, with a paramagnetic-antiferromagnetic transition at TN = 19 K and a paraelectric-ferroelectric transition at Tc = 171 K. The conduction mechanism was studied through current-voltage characteristics measurements from 100 K to 250 K, with the largest peak to valley ratio of 47 observed at 140 K. This high peak to valley ratio was explained based on onsite coulomb interactions in a 1D Hubbard model.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Physical
Muhammad Waqas Khan, Bao Yue Zhang, Kai Xu, Md Mohiuddin, Azmira Jannat, Farjana Haque, Turki Alkathiri, Naresha Pillai, Yichao Wang, Syed Zahin Reza, Jing Li, Xavier Mulet, Ravichandar Babarao, Nasir Mahmood, Jian Zhen Ou
Summary: Plasmonic MOFs, enabled by noble metal nanostructures, are a promising class of MOF nanocomposites with high solar light-harvesting efficiency. This study introduces a novel plasmonic MOF nanocomposite with an ultra-thin degenerately doped molybdenum oxide core and a flexible iron MOF shell, exhibiting low cost, easy synthesis, and non-toxicity. The incorporation of plasmonic oxides in the highly porous MOF structure enhances visible light absorbability, improving photobleaching performance of various dyes and gas sensing capabilities. This work expands the potential applications of plasmonic MOF nanocomposites in solar energy harvesting, environmental remediation, and monitoring.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Tian Luo, Zi Wang, Yinlin Chen, Hengzhao Li, Mengqi Peng, Floriana Tuna, Eric J. L. Mcinnes, Sarah J. Day, Jie An, Martin Schroeder, Sihai Yang
Summary: This study reports a method for photocatalytic dehalogenative deuteration using a metal-organic framework, MFM-300(Cr), as the catalyst. The catalyst shows high deuterium incorporation and excellent tolerance to various functional groups. Synchrotron X-ray powder diffraction and in situ electron paramagnetic resonance spectroscopy reveal the mechanism and reaction pathway.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Inorganic & Nuclear
Eman M. Abou Hussein, Sameh M. Gafar
Summary: Two alkali strontium borate glasses containing Cu2+ or Zn2+ ions were prepared and their dosimetric properties were studied. The glasses showed sensitivity to absorbed dose and exhibited changes in optical properties and electrical conductivity upon irradiation. The presence of transition metal ions contributed to the trapping of radiolytic electrons or holes. The glasses demonstrated stability and potential for use as dosimeters in medical sterilization and food irradiation processing.