Specific heat measurements in pure and in (Cu, Mn, Fe, Ni)-doped single-crystals of l-arginine phosphate monohydrate

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dc.creatorMachado, Fernando Luis de Araujo
dc.creatorSousa, Lázaro Luis de Lima
dc.creatorCunha, R. O.
dc.creatorCabral, F. A. O.
dc.creatorRodrigues, Alexandre Ricalde
dc.creatorCarvalho, Jesiel Freitas
dc.creatorSantana, Ricardo Costa de
dc.date.accessioned2024-07-11T14:58:36Z
dc.date.available2024-07-11T14:58:36Z
dc.date.issued2010
dc.description.abstractThe influence of highly diluted impurities (Cu, Mn, Fe, Ni) on the temperature (T) dependence of the specific heat (cp) of l-arginine phosphate monohydrate (LAP) was investigated in the temperature range 1.8–300 K. The doped samples yielded values for cp in excess to those obtained for a pure LAP sample. The melting temperatures (Tm≈420 K) obtained by differential scanning calorimetry for pure and doped LAP samples were found not to be significantly affected by the impurities. The T-dependence of cp was fully accounted for by taking into consideration the Debye contribution, an Einstein term and a contribution due to both Frenkel and Schottky defects. The model fit all cp versus T data using a single value for both the Debye (θD=160 K) and the Einstein (TE=376.8 K) temperatures, and for the energy (εd=157.9 meV) required to create the defects.
dc.identifier.citationMACHADO, F. L. A.; SOUSA, L. L. L.; CUNHA, R. O.; CABRAL, F. A.O.; RODRIGUES, A. R.; CARVALHO, J. F.; SANTANA, R. C. Specific heat measurements in pure and in (Cu, Mn, Fe, Ni)-doped single-crystals of l-arginine phosphate monohydrate. Journal of Physics and Chemistry of Solids, Amsterdam, p. 862-866, 2010. DOI: 10.1016/j.jpcs.2010.03.034. Disponível em: https://www.sciencedirect.com/science/article/pii/S0022369710000806, Acesso em: 25 maio 2023.
dc.identifier.doi10.1016/j.jpcs.2010.03.034
dc.identifier.issn0022-3697
dc.identifier.issne- 1879-2553
dc.identifier.urihttps://www.sciencedirect.com/science/article/pii/S0022369710000806
dc.language.isoeng
dc.publisher.countryHolanda
dc.publisher.departmentInstituto de Física - IF (RMG)
dc.rightsAcesso Restrito
dc.subjectA. Organic compounds
dc.subjectB. Chemical synthesis
dc.subjectC. Differential scanning calorimetry (DSC)
dc.subjectD. Specific heat
dc.titleSpecific heat measurements in pure and in (Cu, Mn, Fe, Ni)-doped single-crystals of l-arginine phosphate monohydrate
dc.typeArtigo

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