Synthesis and High-Temperature Heat Capacity of Sm2Ge2O7 and Eu2Ge2O7
Source abstract
Abstract
The Sm2Ge2O7 and Eu2Ge2O7 germanates have been prepared by solid-state reactions via multistep firing of stoichiometric mixtures of Sm2O3 (Eu2O3) and GeO2 in air at temperatures from 1273 to 1473 K. The molar heat capacity of the samarium and europium germanates has been determined by differential scanning calorimetry in the range 350–1000 K and the C p (T) data have been used to evaluate their thermodynamic properties.
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Research context
OpenAlex topics: Thermal and Kinetic Analysis · Nuclear materials and radiation effects · Chemical Thermodynamics and Molecular Structure
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References (12)
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1. Bondar’, I.A., Vinogradova, N.V., Dem’yanets, L.N., et al., Soedineniya redkozemel’nykh elementov. Silikaty, germanaty, fosfaty, arsenaty, vanadaty (Rare-Earth Compounds: Silicates, Germanates, Phosphates, Arsenates, and Vanadates), Moscow: Nauka, 1983.
2. Dem’yanets, L.N., Lobachev, A.N., and Emel’chenko, G.A., Germanaty redkozemel’nykh elementov (Rare-Earth Germanates), Moscow: Nauka, 1980.
3. Kozlov, V.D., Magunov, R.L., Kovalevskaya, I.P., et al., Preparation of neodymium, samarium, and europium germanates, Ukr. Khim. Zh (Russ. Ed.), 1973, vol. 39, pp. 658–662.
4. Chirasov, M.I., Mamedov, Kh.S., and Kulieva, T.Z., Hydrothermal synthesis and crystal structure Eu2Ge2O7, Kristallografiya, 1983, vol. 28, no. 5, pp. 1035–1036.
5. Becker, U.W. and Felsche, J., Phases and structural relations of the rare earth germanates RE2Ge2O7, RE = La–Lu, J. Less-Common Met., 1987, vol. 128, pp. 269–280.10.1016/0022-5088(87)90215-3 ↗
6. Zhao, F., Guo, P., Liao, F., et al., Luminescent properties of Eu3+, Tb3+ or Bi3+ activated yttrium germanates, Mater. Res. Bull., 2003, vol. 38, pp. 931–940.10.1016/S0025-5408(03)00086-2 ↗
7. Jana, Y.M., Ghosh, M., Ghosh, D., et al., Measurements of the magnetic susceptibility and anisotropy of Tb2Ge2O7 single crystal, J. Magn. Magn. Mater., 2000, vol. 210, pp. 93–103.10.1016/S0304-8853(99)00759-3 ↗
8. Jouhet-Vetter, G. and Queyroux, F., Etude de quelques composes Ln2Ge2O7 (Ln = La, Nd, Sm, Eu, Gd), Mater. Res. Bull., 1975, vol. 10, pp. 1201–1204.10.1016/0025-5408(75)90027-6 ↗
9. Solovyov, L.A., Full-profile refinement by derivate difference minimization, J. Appl. Crystallogr., 2004, vol. 37, pp. 743–749.10.1107/S0021889804015638 ↗
10. Denisov, V.M., Denisova, L.T., Irtyugo, L.A., and Biront, V.S., Thermal physical properties of Bi4Ge3O12 single crystals, Phys. Solid State, 2010, vol. 52, no. 7, pp. 1362–1365.10.1134/S1063783410070073 ↗
11. Lietner, J., Chuchvalec, P., Sedmidubský, D., et al., Estimation of heat capacities of solid mixed oxides, Thermochim. Acta, 2003, vol. 395, pp. 27–46.10.1016/S0040-6031(02)00177-6 ↗
12. Moiseev, G.K., Vatolin, N.A., Marshuk, L.A., et al., Temperaturnye zavisimosti privedennoi energii Gibbsa nekotorykh neorganicheskikh veshchestv (al’ternativnyi bank dannykh ASTRA. OWN) (Temperature-Dependent Reduced Gibbs Energy of Some Inorganic Substances: ASTRA.OWN Alternative Database), Yekaterinburg: Ural’sk. Otd. Ross. Akad. Nauk, 1997.