Pressure-Dependent Reversible Increase in Tc for the Ferrimagnetic 2-D MnII(TCNE)I(OH2) and 3-D MnII(TCNE)3/2(I3)1/2
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- 作者：Jack G. DaSilva ; Amber C. McConnell ; Joel S. Miller
- 刊名：Inorganic Chemistry
- 出版年：2013
- 出版时间：April 15, 2013
- 年：2013
- 卷：52
- 期：8
- 页码：4629-4634
- 全文大小：467K
- 年卷期：v.52,no.8(April 15, 2013)
- ISSN：1520-510X
文摘
The pressure dependence of the magnetic properties of ferrimagnetic MnII(TCNE)I(OH2) up to 14.05 kbar and MnII(TCNE)3/2(I3)1/2路zTHF up to 14.32 kbar were studied. For MnII(TCNE)I(OH2), two distinct pressure regions separated at 1 kbar were evident in both the temperature and the field-dependent magnetic measurements. No increase of the magnetic properties was observed in the low-pressure region, while significant increases to the magnetic ordering temperature, Tc, bifurcation temperature, Tb, coercive field, Hcr, and remnant magnetization, Mr, were evident in the high-pressure region. The Tc, Tb, Hcr, Mr, and M(5 T) reversibly increased from ambient pressure values of 169 K, 169 K, 690 Oe, 620 emuOe/mol, and 13鈥?00 emuOe/mol to 257 K, 261 K, 1460 Oe, 2300 emuOe/mol, and 17鈥?00 emuOe/mol at 14.05 kbar, respectively. For MnII(TCNE)3/2(I3)1/2路zTHF, the Tc and Tb were nearly coincident and increased linearly from 173 and 173 K, respectively, at ambient pressure to 273 and 272 K, respectively, at 14.32 kbar. Thus, the Tc increased at an average rate of 6.25 and 7.18 K/kbar for MnII(TCNE)I(OH2) and MnII(TCNE)3/2(I3)1/2路zTHF, respectively. For Mn(TCNE)1/2(I3)1/2路zTHF remnant magnetization and saturation magnetization did not significantly change with applied pressure. The Hcr exhibited a linear increase from ambient pressure to 5.00 kbar, reaching 860 Oe, but only achieving 880 Oe at 14.32 kbar.