SDS Volume
Volume 73. Metal and Ammonium Formate Systems, p None
Source Publication
Plyushchev, V. E.; Shklover, P. P.; Shkolnikova, L. M.; Kuznetsova, C. P.; Nadezhdina, G. V.; Dokl. Akad. Nauk SSR 160, 366-9 (1965).
Conditions:
Room Temp: 25 - 50 °C
Compilers:
St. Trendafilova, Chr. Balarew
Methodology:
The isothermal method was used. The mixtures were stirred for one week. $\ce{Eu^{3+}}$ was determined complexometrically [1]. $\ce{Nd^{3+}}$ and $\ce{Sm^{3+}}$ were determined gravimetrically as $\ce{Nd2O3}$ and $\ce{Sm2O3}$, respectively. The solid phases were analyzed by DTA and IR spectroscopy.
Sample Information:
- The formate salts were prepared by reacting the respective hydroxide with formic acid. The $\ce{Nd2O3}$, $\ce{Sm2O3}$ and $\ce{Eu2O3}$ had 0.05-1.5 mass% impurities. The formic acid has $n_{D}^{20}$ = 1.3712.
Measurement Errors:
Ambient temperature: The temperature was controlled to within ±0.1°C.
Methodology Citation
1 Martinenko, L. I.; Nauchn. Dokl. Vyssh. Shk. Khim. Khim. Tekhnol. N4, 718 (1958).
System Components:
- Neodymium formate, $\ce{ Nd(CHO2)3 }$; [3252-53-7] NIST WebBook
- Samarium formate, $\ce{ Sm(CHO2)3 }$; [3252-54-8] NIST WebBook
- Europium formate, $\ce{ Eu(CHO2)3 }$; [3252-55-9] NIST WebBook
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
Authors' Comment: The solubility is expressed as % oxide because at 50°C, hydrolysis possibly occurs. Analysis of crystal phases dried at room temperature shows a composition Me(CHO2)3·nH2O where n = 0-0.5 for the formates from La to Ho. However the presence of water could not be confirmed by IR spectroscopy. For Eu and Gd, n = 0.
| $T$ (°C) | 100w1' | 100w1 | m1 (mol/kg) a | m2 (mol/kg) a | Phase (s) () b |
|---|---|---|---|---|---|
| 25 | 0.24 | 0.40a | 7 x 10-3 | 0.014 | A |
| 40 | 0.26 | 0.43 | 8 x 10-3 | 0.015 | A |
| 50 | 0.26 | 0.43 | 8 x 10-3 | 0.015 | A |
(a) These values were calculated by the compilers.
(a) These values were calculated by the compilers.
(a) These values were calculated by the compilers.
(b) The solid phase is: B = Sm(CHO2)3.
(b) The solid phase is: C = Eu(CHO2)3.
(b) The solid phase is: A = Nd(CHO2)3.
