ISOTOPIC EFFECTS IN THE STRUCTURAL PROPERTIES OF SOLIDS

Journal Article · Sat Dec 01 00:00:00 EST 1962 · Uspekhi Fizicheskikh Nauk (U.S.S.R.) For English translation of v61 1957-v65 1958 see Advan. Phys. Sci. (USSR)

OSTI ID:4749682

Kogan, V S

In general, the lattice parameter of a compound decreases when hydrogen is replaced by deuterium. Lattice parameters are given and compared for the following pairs: HfH/sub 2/ and HfD/sub 2/, NH/sub 4/Cl and ND/sub 4/Cl, NH/sub 4/ Br and ND/sub 4 /Br, NH/sub 4/I and ND/sub 4/I, KH/sub 2/PO/sub 4/ and KD/sub 2/ PO/sub 4/, KHF/sub 2/ and KDF/su b 2/, CO(NH/sub 2/)/sub 2/ and CO(ND/sub 2/)/sub 2/, and various carboxylic and hydroxy compounds. The replacement of hydrogen by deuterium generally results in a rise of the linear expansion temperature coefficient. If a polymorphic transformation is involved, this replacement causes a shift in the critical temperature of the transformation. The low- temperature transformation of the ammonium halides is discussed, After reviewing the equipment required to determine lattice parameters at liquid hydrogen or helium temperatures, the various transitions and lattice parameters are given for He/sup 3/, He/sup 4/, Li/sup 6/ Li/sup 7/, Ne/sup 20/, Ne/sup 22/, Ni/sup 58/, Ni/ sup 64/, and the hydrogen isot opes. Theoretical explanations of the isotopic effect in solids are based on the difference in zero energies for two isotopes that differ only in mass. The differences in lattice energies are given as a function of temperature and various binding energies for a number of isotopes. Phase diagrams are given for the hydrogen isotopes. (119 references.) (TTT)

• Research Organization: Originating Research Org. not identified
• NSA Number: NSA-17-014291
• OSTI ID: 4749682
• Journal Information: Uspekhi Fizicheskikh Nauk (U.S.S.R.) For English translation of v61 1957-v65 1958 see Advan. Phys. Sci. (USSR), Vol. Vol: 78; Other Information: Orig. Receipt Date: 31-DEC-63
• Country of Publication: Country unknown/Code not available
• Language: Russian

Related Subjects

CHEMISTRY
ALLOTROPY
AMMONIUM COMPOUNDS
BINDING ENERGY
BROMIDES
CHLORIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
EXPANSION
HAFNIUM HYDRIDES
HELIUM 3
HELIUM 4
HYDROGEN
IODIDES
ISOTOPE EFFECTS
ISOTOPIC EXCHANGE
LABORATORY EQUIPMENT
LATTICES
LITHIUM 6
LITHIUM 7
NEON 20
NEON 22
NICKEL 58
NICKEL 64
PHASE DIAGRAMS
POTASSIUM FLUORIDES
POTASSIUM PHOSPHATES
QUANTITATIVE ANALYSIS
SOLIDS
TEMPERATURE
TRITIUM
UREA