Small angle neutron scattering from D2O in the critical region

Autor:	Henry E. Fischer, D. M. Sullivan, George W. Neilson, A R Rennie
Rok vydání:	2000
Předmět:	Reduced properties Condensed matter physics Scattering Chemistry Thermodynamic limit General Materials Science Ising model Condensed Matter Physics Structure factor Power law Critical exponent Small-angle neutron scattering
Zdroj:	Journal of Physics: Condensed Matter. 12:3531-3542
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/12/15/303
Popis:	Small angle neutron scattering experiments were carried out on D2 O on the critical isochore. Apparatus was used which enabled the control of temperature to ±0.01 K and pressure to 10 mbar. The corrected scattering data were used to extract values for the correlation length of the critical density fluctuations, , and the thermodynamic limit of the structure factor, S (0). Both quantities are found to show divergent power-law behaviour with reduced temperature, and have exponents = 0.62±0.03 and = 1.14±0.05, respectively. These results confirm that D2 O belongs to the three-dimensional Ising universality class. A value of 0 = 1.30±0.23 A was calculated for the characteristic correlation length of D2 O, a result that compares favourably with that inferred from thermodynamic data and calculated theoretically.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::63bf94af1147c8feeedc02e48c0276d9 https://doi.org/10.1088/0953-8984/12/15/303 Zobrazit plný text záznamu