Praseodymium--silver (1/2) | 12310-27-9

• 分子结构分类: 无机化合物 - 无机盐 - 无机银盐
• 英文名称: Praseodymium--silver (1/2)
• 英文别名: praseodymium;silver
• CAS: 12310-27-9
• 化学式: Ag₂Pr
• 分子量: 356.644
• InChiKey: DDTXJNCABSFMFT-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.01
• 重原子数：
  3
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为产物：
  描述：

  三氢化镨 、 银 以 neat (no solvent) 为溶剂， 生成 Praseodymium--silver (1/2)
  参考文献：
  名称：

  Ikonomou, P. F., Journal of the Less-Common Metals, 1980, vol. 72, p. P24 - P30

  摘要：

  DOI：

文献信息

• Thermochemistry of some binary alloys of silver with the lanthanide metals by high temperature direct synthesis calorimetry
  作者：S.V Meschel、O.J Kleppa

  DOI：10.1016/j.jallcom.2003.11.160

  日期：2004.8

  The standard enthalpies of formation of some lanthanide silver compounds have been measured by high temperature direct synthesis calorimetry at 1373 +/- 2 K. The following results (in kJ/mol of atoms) are reported: 1: 1 composition-AgTb (-36.5 +/- 2.9); AgDy (-37.3 +/- 1.8); AgEr (-44.9 +/- 3.2); AgTm (-43.0 +/- 2.3); 2:1 composition-Ag2Pr (-24.7 +/- 1 1.6); Ag2Nd (-21.8 +/- 1.9); Ag2Gd (-23.9 +/- 1.6); Ag2Tb (-22.7 +/- 1.8); Ag2Dy (-22.3 +/- 2.3); Ag2Ho (-25.0 +/- 2.3); Ag2Er (-24.0 +/- 2.3); Ag2Tm (-24 +/- 3); Ag2Lu (-25.6 +/- 1.9); 3:1 composition-Ag3Tb (-20.6 +/- 2.0); Ag3Dy (-22.8 +/- 1.9); Ag3Ho (-25.1 +/- 2.0); Ag3Er (-25.4 +/- 2.3); Ag3Tm (-20.2 +/- 2.3). The results are compared with the semi-empirical predicted values of Miedema and coworkers and with the values predicted by Gschneidner for lanthanide alloys. They are also compared with the enthalpies of formation of the Au-LA systems by the present authors. (C) 2003 Elsevier B.V. All rights reserved.
• Not Just Par for the Course: 73 Quaternary Germanides <i>RE</i>₄<i>M</i>₂<i>X</i>Ge₄ (<i>RE</i> = La–Nd, Sm, Gd–Tm, Lu; <i>M</i> = Mn–Ni; <i>X</i> = Ag, Cd) and the Search for Intermetallics with Low Thermal Conductivity
  作者：Dong Zhang、Anton O. Oliynyk、Gabriel M. Duarte、Abishek K. Iyer、Leila Ghadbeigi、Steven K. Kauwe、Taylor D. Sparks、Arthur Mar

  DOI：10.1021/acs.inorgchem.8b02279

  日期：2018.11.19

  total of 73 new quaternary rare-earth germanides RE4M2XGe4 (RE = rare-earth metal; M = Mn-Ni; X = Ag, Cd) were prepared through reactions of the elements. The solid solution Nd4Mn2Cd(Ge1-ySiy)(4) was also prepared under the same conditions and found to be complete over the entire range. All of these compounds adopt the monoclinic Ho4Ni2InGe4-type structure (space group C2/m, a = 14.2-16.7 angstrom, b = 4.0-4.6 angstrom, c = 6.8-7.5 angstrom, beta = 106-109 degrees), as revealed by powder X-ray diffraction analysis and single-crystal X-ray diffraction analysis on selected members. The structure determination of Nd-4(Mn0.78(1)Ag0.22(1))(2)Ag0.83(1)Ge4 disclosed disorder of Mn and Ag atoms within the tetrahedral site and Ag deficiencies within the square planar site. Within the solid solution Nd4Mn2Cd(Ge1-ySiy)(4), the end-members and two intermediate members were structurally characterized; as the Si content increases, the Cd sites become less deficient and the individual [Mn(2)Tt(2)] layers contract but become further apart from each other. Electronic band structure calculations confirm that the Ag-Ge or Cd-Ge bonds are the weakest in the structure and thus prone to distortion. Thermal property measurements confirm expectations from machine-learning predictions that these quaternary germanides should exhibit low thermal conductivity, which was found to be <10 W m(-1) for Nd4Mn2AgGe4.