lanthanum ultraphosphate | 12501-21-2

• 英文名称: lanthanum ultraphosphate
• CAS: 12501-21-2
• 化学式: LaO₁₄P₅
• 分子量: 517.766
• InChiKey: SYRNJCMKVKWGEC-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -4.66
• 重原子数：
  12.0
• 可旋转键数：
  0.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  189.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为反应物：
  描述：

  lanthanum ultraphosphate 以 neat (no solvent, solid phase) 为溶剂， 生成 lanthanum orthophosphate
  参考文献：
  名称：

  Phase Equilibria in the System La2O3-P2O5

  摘要：

  Subsolidus phase equilibria in the system La2O3‐P2O5 were established. The system contains six intermediate compounds having molar La2O3:P2O5 ratios of 3:1,7:3,1:1,1:2,1:3, and 1:5. It was found that the 3:1 compound has a phase transformation at 935°C. The 1:2 compound decomposes to a mixture of 1:1 and 1:3 at 755°C. The 1:3 compound melts incongruently to 1:1 and liquid at 1235°C and the 1:5 compound melts congruently at 1095°C. None of the lanthanum phosphates have lower temperature limits of stability.

  DOI：

  10.1111/j.1151-2916.1984.tb19140.x
• 作为产物：
  描述：

  lanthanum metaphosphate 以 neat (no solvent, solid phase) 为溶剂， 生成 lanthanum ultraphosphate
  参考文献：
  名称：

  Balagina; Chudinova; Murashova, Russian Journal of Inorganic Chemistry, 2004, vol. 49, # 4, p. 614 - 616

  摘要：

  DOI：

文献信息

• Studies on thermal stability of mixed metaphosphates KLa(PO3)4 and K2La(PO3)5
  作者：W. Jungowska、T. Znamierowska

  DOI：10.1007/bf01914131

  日期：1990.9

  Within an investigation of the phase equilibria in the binary system La(PO3)3-KPO3, the thermal behaviour of the mixed metaphosphates KLa(PO3)4 and K2La(PO3)5 has been examined.
• Conductivity Enhancement in Lanthanum Phosphates
  作者：Satyajit R. Phadke、Juan C. Nino

  DOI：10.1111/j.1551-2916.2010.04319.x

  日期：2011.6

  Current proton exchange membranes (PEM) are based on polymeric materials such as perfluorosulfonic acid (Nafion (TM)), which have an upper limit to their temperature of operation (< 100 degrees C). To overcome this limitation, ceramic PEM materials are being investigated for transportation applications, where operating temperatures in the range of 200 degrees-600 degrees C are desired. In this study, the conductivity behavior of lanthanum orthophosphate (LaPO(4)) has been compared and contrasted with lanthanum ultraphosphate (LaP(5)O(14)) in order to better understand crystal structure-proton conduction relationships in ceramic materials. The conductivity of the lanthanum phosphates (doped and undoped) was measured using impedance spectroscopy in the temperature range 300 degrees-600 degrees C. The conductivity of 5 mol% Sr2+-doped LaP(5)O(14) (1.01 x 10-4 S/cm, 600 degrees C) was found to be an order of magnitude higher than similarly doped LaPO(4) (7.00 x 10-6 S/cm, 600 degrees C), which is a well-investigated proton conducting material. In addition, it was observed that the activation energy for protonic conduction was much lower for doped LaP(5)O(14) (0.80 +/- 0.01 eV) as compared with LaPO(4) (1.09 +/- 0.01 eV). A hypothesis relating the oxygen-to-oxygen ion distance in a material to the activation energy for proton conduction is presented and the experimental results obtained have been critically examined on the basis of the hypothesis and other relevant literature. From this analysis, it is shown that the condensed nature of the phosphate anion in LaP(5)O(14) can provide low-energy avenues for proton transport within the material leading to enhanced conductivity in the material. Limitations of the currently proposed model for proton conduction along with some other plausible explanations for the conductivity enhancement have also been discussed.
• Chudinova, N. N.; Vinogradova, N. V.; Palkina, K. K., Inorganic Materials, 1978, vol. 14, p. 1595 - 1599
  作者：Chudinova, N. N.、Vinogradova, N. V.、Palkina, K. K.

  DOI：——

  日期：——
• Valtere, A. Ya., Inorganic Materials, 1987, vol. 23, p. 250 - 253
  作者：Valtere, A. Ya.

  DOI：——

  日期：——
• Phase equilibrium in the system LaP3O9−NaPO3−P2O5
  作者：J. Kropiwnicka

  DOI：10.1007/bf02636290

  日期：1995.3

  The phase diagram of the ternary system LaP3O9-NaPO3-P2O5 was constructed through the use of a new compound NH4LaP4O12. Ammonium lanthanum phosphate NH4LaP4O12 crystallizes in the monoclinic system, space group C2/c, with a=7.941(4)Angstrom, b=12.645(13)Angstrom, c=10.702(9)Angstrom, gamma=110.00(5). The compound melts incongruently at 1198 degrees C. Lanthanum pyrophosphate melts incongruently at 1160 degrees C.