X-Ray Studies on Solid Solutions of Oxygen in a-Zirconium.

Holmberg, Bo; Dagerhamn, Tore; Leppänen, Kaarina

doi:10.3891/acta.chem.scand.15-0919

Cited by 106 publications

(20 citation statements)

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“…Oxygen atoms dissolved into hexagonal zirconium or titanium are known to expand the metal lattice in the c-axis direction, as evidenced by the composition dependence of the lattice parameter Co of the zirconium-oxygen solid solution shown in the lower part of Fig. 6 (Holmberg & Dagerhamn, 1961;Yamaguchi, 1968). The spacings of successive (00.2) planes, cl and % of ZrO: shown above are both larger than the corresponding spacing 2.575 A in pure zirconium, and it seems natural that the spacing between the planes which sandwich the interstitial layer containing more oxygen is much greater than the other spacing.…”

Section: Discussionmentioning

confidence: 99%

“…Holmberg & Dagerhamn (1961) considered these atoms to occupy randomly the interstitial sites A ', B, C and C' in Fig. l, which are normally vacant at the composition Zr30.…”

Section: Discussionmentioning

confidence: 99%

“…In the composition range from Zr-21 to -24% O* an ordered structure designated as ZrOx is formed, in which the arrangement of oxygen atoms can be described as a regular stacking of interstitial layers parallel to the (00.1) plane with the sequence ...ABCABC... (Dubertret & Lehr, 1968;Yamaguchi, I968). Another type of ordered arrangement, designated as ZrOy, is formed with the stacking sequence... ABAB... in the composition range richer in oxygen than 26% (Holmberg & Dagerhamn, 1961;Yamaguchi, 1968). Several kinds of long-period stacking of layers were found to exist at compositions around Zr-25% O (Yamaguchi,.…”

Section: Introductionmentioning

confidence: 99%

“…The crystals were annealed at 600 °C for two weeks and then at 400°C for two subsequent weeks. The oxygen concentration was determined by measuring by X-ray diffraction the identity period along the c axis which has been observed to show a nearly linear dependence on the oxygen concentration (Holmberg & Dagerhamn, 1961;Yamaguchi, 1968). It is 28.2% for one kind of specimen and 29.2 % for the other.…”

Section: Specimen Preparation and Heat Treatmentmentioning

confidence: 99%

See 3 more Smart Citations

Atomic ordering and lattice distortion in the zirconium–oxygen alloys with 28.2 and 29.2 at.% oxygen

Hashimoto¹,

Iwasaki²,

Ogawa³

et al. 1974

J Appl Cryst

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The structure of the interstitially ordered lattice formed in zirconium-oxygen alloys has been studied with use of single-crystal data obtained by X-ray and neutron diffraction methods. The structure belongs to space group P312 and the lattice parameters a and c are related to a0 and c0 of the host hexagonal metal lattice by a= ]/3ao and c= c0. The ordered arrangement of interstitial oxygen atoms is described as a regular stacking of layers parallel to the (00.1) plane with the sequence (AC)B(AC)B .... which is of the same type as that of nitrogen atoms in e-Fe2N. The occupancy probability of oxygen atoms is high for interstitial sites of the A and B types while it is low for sites of the C type. The host metal lattice is distorted in such a way that spacings of successive (00.2) planes are not the same and a hexagonal network of atoms in these planes is periodically deformed.

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Section: Discussionmentioning

confidence: 99%

“…Holmberg & Dagerhamn (1961) considered these atoms to occupy randomly the interstitial sites A ', B, C and C' in Fig. l, which are normally vacant at the composition Zr30.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Specimen Preparation and Heat Treatmentmentioning

confidence: 99%

See 2 more Smart Citations

Atomic ordering and lattice distortion in the zirconium–oxygen alloys with 28.2 and 29.2 at.% oxygen

Hashimoto¹,

Iwasaki²,

Ogawa³

et al. 1974

J Appl Cryst

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“…Though a 100% change in shear modulus is not commonly observed, this enormous increase in Peierls stress can be qualitatively understood. Long-range ordering of 340 oxygen atoms has been reported [44] in zirconium-oxygen alloys containing about 26 at. % oxygen.…”

Section: 4 Sec -1 Thus Equation 9 Representingmentioning

confidence: 99%

An evaluation of rate-controlling obstacles for low-temperature deformation of zirconium

1971

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The low-temperature plastic flow of alpha-zirconium was studied by employing constantrate tensile tests and differential-stress creep experiments. The activation parameters, enthalpy and area, have been obtained as a function of stress for pure, as well as commercial zirconium. The activation area is independent of grain size and purity and -falls to about 9b 2 at high stresses. The deformation mechanism below about 700 ~ K is found to be controlled by a single thermally activated process, and not a two-stage activation mechanism. Several dislocation mechanisms are examined and it is concluded that overcoming the Peierls energy humps by the formation of kink pairs in a length of dislocation is the rate-controlling mechanism. The total energy needed to nucleate a double kink is about 0.8 eV in pure zirconium and 1 eV in commercial zirconium.

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Order-disorder transformation of oxygen atoms dissolved in zirconium studied by neutron diffraction

Hirabayashi

Yamaguchi

Arai

et al. 1974

Phys. Stat. Sol. (a)

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Neutron diffraction experiments have been made to reveal the nature of the interstitial order‐disorder transformation in the ZrO system using single crystals. The disordering transition of the alloy with O/Zr ⪅ 0.3 occurs below 450 °C, while in the composition O/Zr = 0.3 to 0.4 the disordering undergoes stepwise in such a way that the stacking sequence of the oxygen‐atom layers changes below 600 °C and subsequently the ordered distribution in the layers becomes random. A tentative phase diagram is proposed on the basis of the present results.

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X-Ray Studies on Solid Solutions of Oxygen in a-Zirconium.

Cited by 106 publications

References 0 publications

Atomic ordering and lattice distortion in the zirconium–oxygen alloys with 28.2 and 29.2 at.% oxygen

Atomic ordering and lattice distortion in the zirconium–oxygen alloys with 28.2 and 29.2 at.% oxygen

An evaluation of rate-controlling obstacles for low-temperature deformation of zirconium

Order-disorder transformation of oxygen atoms dissolved in zirconium studied by neutron diffraction

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