Davidson Royce A, Miller Joel S
Department of Chemistry, University of Utah, 315 S 1400 East, Salt Lake City, Utah 84112-0850, United States.
Inorg Chem. 2021 Sep 6;60(17):12766-12771. doi: 10.1021/acs.inorgchem.1c00777. Epub 2021 Aug 16.
The pressure dependence of the magnetic properties of rhombohedral NaMn[Mn(CN)] up to 10 kbar has been studied. The magnetic ordering temperature, , for NaMn[Mn(CN)] reversibly increases with increasing applied hydrostatic pressure, , by 9.0 K (15.2%) to 68 K at 10 kbar with an average rate of increase, d/d, of 0.86 K/kbar. The magnetization at 50 kOe and remanent magnetization, (), remain constant with an average value of 13,100 ± 200 and 8500 ± 200 emuOe/mol. The coercive field increases by 12% from 13,400 to 15,000 Oe. The increase and rate of increase of for rhombohedral NaMn[Mn(CN)] are reduced with respect to monoclinic AMn[Mn(CN)] (A = K and Rb), but they are still greater than those of cubic CsMn[Mn(CN)]. This is attributed to the compression of the MnNC framework bonding without decreasing ∠Mn-N≡C, maintaining the unit cell in accord with cubic A = Cs at lower applied pressures, and not due to reduction in ∠Mn-N≡C, which correlates with increasing that is reported for A = K and Rb as well as Cs at higher applied pressures.
研究了菱面体NaMn[Mn(CN)]在高达10千巴压力下的磁性能与压力的关系。NaMn[Mn(CN)]的磁有序温度(T_N)随外加静水压力(P)的增加而可逆增加，在10千巴时增加了9.0 K（15.2%），达到68 K，平均增加速率(dT_N/dP)为0.86 K/千巴。50 kOe下的磁化强度和剩余磁化强度(M_r)保持恒定，平均值分别为13100±200和8500±200 emuOe/mol。矫顽场(H_c)从13400 Oe增加了12%，达到15000 Oe。菱面体NaMn[Mn(CN)]的(T_N)增加量和增加速率相对于单斜晶系的AMn[Mn(CN)]（A = K和Rb）有所降低，但仍大于立方晶系的CsMn[Mn(CN)]。这归因于MnNC框架键合的压缩，而不降低∠Mn-N≡C，在较低外加压力下保持与立方晶系A = Cs一致的晶胞，而不是由于∠Mn-N≡C的减小，后者与A = K、Rb以及Cs在较高外加压力下报道的(T_N)增加相关。
