Abstract
Dysprosium hafnate is a candidate material for as control rods in nuclear reactor because dysprosium (Dy) and hafnium (Hf) have very high absorption cross-sections for neutrons. Dysprosium hafnate (Dy2O3·2HfO2-fluorite phase solid solution) was prepared by solid-state as well as wet chemical routes. The fluorite phase of the compound was characterized by using X-ray diffraction (XRD). Thermal expansion characteristics were studied using high temperature X-ray diffraction (HTXRD) in the temperature range 298–1973 K. Heat capacity measurements of dysprosium hafnate were carried out using differential scanning calorimetry (DSC) in the temperature range 298–800 K. The room temperature lattice parameter and the coefficient of thermal expansion are 0.5194 nm and 7.69 × 10−6 K−1, respectively. The heat capacity value at 298 K is 232 J mol−1 K−1.
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References
Colin M. Materianx absorbants neutroniques pour le pilotage des reacteurs nucleaires, Techniques de l’lngenieur. Genie nucleaires. 1989;B8-2:3720–5.
Syamala KV, Panneerselvam G, Subramanian GGS, Antony MP. Synthesis, characterization and thermal expansion studies on europium titanate. Thermochim Acta. 2008;475:76–9.
Panneerselvam G, Venkata Krishnan R, Antony MP, Nagarajan K, Vasudevan T, Vasudeva Rao PR. Thermophysical measurements on dysprosium and gadolinium titanates. J Nucl Mater. 2004;327(2–3):220–5.
Risovany VD, Varlashova EE, Suslov DN. Dysprosium titanate as an absorber materials for control rods. J Nucl Mater. 2000;281:84–9.
Perova EB, Spiridonov LN, Komisarova LN. Phase equilibria in the system HfO2 – Dy2O3. Inorg Mater. 1972;8:1878–80.
Risovany VD, Zakharov AV, Muraleva EM, Kosenkov VM, Latypov RN. Dysprosium hafnate as an absorbing material for control rods. J Nucl Mater. 2006;355:163–70.
DRSprink, JHSchemel. The development of rare earth pyrohafnates for power reactor control-rod materials. J Nucl Mater 1973/74;49:1–9.
Xue B, Li XF, Wang JY, Yu SJ, Tan ZC, Sun LX. Heat capacities and thermodynamic properties of trans-(R)-3-(2,2-dichloroethenyl)-2,2-dimethylcyclopropanecarboxylic acid. J Therm Anal Calorim. 2008;94:529–34.
Qiu SJ, Chu HL, Zhang J, Qi YN, Sun LX, Xu F. Heat capacities and thermodynamic properties of CoPc and CoTMPP. J Therm Anal Calorim. 2008;91:841–8.
Panneerselvam G, Antony MP, Vasudevan T. Studies on lattice thermal expansion and XPS of ThO2-NdO1.5 solid solutions. Thermochim Acta. 2006;443:109–15.
Venkata Krishnan R, Nagarajan K. Heat capacity measurements on uranium-cerium mixed oxides by differential scanning calorimetry. Thermochim Acta. 2006;440:141–5.
Powder diffraction files (Inorganic Phases), Joint Committee on Powder Diffraction Data (JCPDS), International Centre for Diffraction Data (1999). ICDD card number: 24-0360.
Cullity BD. Elements of X-ray diffraction, Chapter 11. 2nd ed. Reading, MA: Addison Weseley Publishing Co.; 1978.
Venkata Krishnan R, Nagarajan K, Vasudeva Rao PR. Heat capacity measurements on BaThO3 and BaCeO3. J Nucl Mater. 2001;299:28–31.
Spencer PJ. Thermochemical properties. In: Komarek KL, editor. Hafnium: physico-chemical properties of its compounds and alloys, Atomic Energy Reviews, vol. 8. Vienna: International Atomic Energy Agency; 1981, p. 424–7.
Pankratz LB. Thermodynamic properties of elements and oxides, Bull US Bur Mines. 1982.
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Panneerselvam, G., Venkata Krishnan, R., Nagarajan, K. et al. Thermal expansion and heat capacity of dysprosium hafnate. J Therm Anal Calorim 101, 169–173 (2010). https://doi.org/10.1007/s10973-009-0430-8
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DOI: https://doi.org/10.1007/s10973-009-0430-8