The heat capacity of NdPO4

Solubility measurements of synthetic neodymium monazite as a function of temperature at 2kbars, and aqueous neodymium speciation in equilibrium with monazite

“…It is apparent in Fig. 3 that our experimental results obtained at high temperature are in good agreement with the calculated solubilities at 25°C using the D f G°given by Poitrasson et al (2004) and the calculated value from calorimetric data of Ushakov et al (2001) and Popa et al (2006). Thus, it appears from Fig.…”

“…However, the coherence of our results obtained at high temperature can be checked with the calculated solubility at 25°C and 1 bar in pure water or in H 2 ONaCl ± HCl ± NaOH, using the various thermodynamic data available. For these calculations, values of association constants for aqueous Nd-species and phosphoric acid are the same (indicated in Table 1), the only variable in addition to the sodium molality (mNa = 0 and 0.2 m), is the Gibbs energy of formation (D f G°) of Nd-monazite with values of À1839.5, À1824 and À1816 kJ mol À1 taken from Poitrasson et al (2004), Ousoubalyev et al (1975) and Marinova and Yaglov (1976), respectively, and finally D f G°= À1849.1 kJ mol À1 , which is the value calculated from calorimetric data of Ushakov et al (2001) and Popa et al (2006) (Table 2). It is apparent in Fig.…”

“…For dilute solutions and neutral species, the activity a is equal to the molality m as the activity coefficient tends towards 1, K ¼ m NdðOHÞ 3 0 Â m H 3 PO 4 0 , and thus the equilib-Poitrasson et al, 2004;Haas et al, 1995) H 2 O-NaCl 0.2m(Poitrasson et al, 2004;Haas et al, 1995) H 2 O(Ushakov et al, 2001 ;Popa et al, 2006;Haas et al, 1995) …”

Heat capacity, thermal expansion, and thermal diffusivity of NaUO2BO3

“…All measured enthalpy increment data were fitted using a combined linear regression together with the room temperature heat capacity data obtained from the PPMS measurements performed as part of this study. A Maier-Kelly-type second-order polynomial equation was used, similar to our previous studies for alkaline and alkaline-earths uranates [14,15]. The following heat capacity equations were obtained: The error indicated is the standard deviation of the average value from several sample drops 0 100 200 300 400 500 600 700 800 900 1000 1100 1200 …”

Flux growth and characterizations of NdPO4 single crystals

“…Therefore, self-activated Nd-stoichiometric laser crystals with high Nd-concentration and low concentration quenching have attracted people's interest. Many Nd-stoichiometric laser crystals were reported, such as NdP 5 O 14 (NdPP) [1], LiNdP 4 O 12 (LNP) [2][3], NdAl 3 (BO 3 ) 4 (NAB) [4] and KNdP 4 O 12 (KNP) [4].…”