Published March 1986
| Version v1
Journal article
The thermal behaviour of the quadrupole hyperfine interaction in (NH4)2HfF6
Creators
- 1. La Plata Univ. Nacional (Argentina). Dept. de Fisica
Description
A TDPAC investigation has been accomplished on (NH4)2HfF6 between 14 and 620 K. A phase transition was observed below 390 K. The low temperature phase is characterized by two non-equivalent sites for hafnium atoms in a 1:1 ratio. The high temperature phase, on the other hand, is depicted by a unique quadrupole interaction. Above 400 K, the compound decomposes successively to NH4HfF5, NH4Hf2F9 and HfF4. An enthalpy of 76 +- 4 kJ/mol could be determined for the (NH4)2HfF6 → NH4HfF5 + NH4F chemical reaction. The hyperfine interaction and thermal evolution of (NH4)2HfF6 was found to be quite similar to that of (NH4)2ZrF6. (Auth.)
Additional details
Publishing Information
- Journal Title
- Hyperfine Interact.
- Journal Volume
- 30
- Journal Issue
- 1
- Series
- Hyperfine Interact.
- Journal Page Range
- 9-16
- ISSN
- 0304-3843
- CODEN
- HYIND
INIS
- Country of Publication
- Netherlands
- Country of Input or Organization
- Switzerland
- INIS RN
- 17056211
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Descriptors DEI
- AMMONIUM FLUORIDES; DIFFERENTIAL PAC; HAFNIUM FLUORIDES; HAFNIUM 181; HIGH TEMPERATURE; HYPERFINE STRUCTURE; LOW TEMPERATURE; MEDIUM TEMPERATURE; PHASE TRANSFORMATIONS; QUADRUPOLE MOMENTS; VERY LOW TEMPERATURE
- Descriptors DEC
- AMMONIUM COMPOUNDS; AMMONIUM HALIDES; ANGULAR CORRELATION; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; CORRELATIONS; DAYS LIVING RADIOISOTOPES; EVEN-ODD NUCLEI; FLUORIDES; FLUORINE COMPOUNDS; HAFNIUM COMPOUNDS; HAFNIUM ISOTOPES; HALIDES; HALOGEN COMPOUNDS; HEAVY NUCLEI; ISOTOPES; NUCLEI; PERTURBED ANGULAR CORRELATION; RADIOISOTOPES; TRANSITION ELEMENT COMPOUNDS