On the Phase Transition in Cuprous Iodide

Miyake, Susumu; Hoshino, Satoshi; Takenaka, Tohru

doi:10.1143/jpsj.7.19

Cited by 171 publications

(82 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…et 01. (16) reported that CuI, which has nornlally the zinc blende type (y) structure at room temperature, changes co~npletely to the hexagonal wurzite (p) at 369 "C. However, anomalous changes in the crystal structure were said to begin at about 200 "C. From the present results one would say that the anomalous behavior of CuI starts at 138 "C. Three runs were perfornled and identical results were obtained. …”

Section: Mercuric Iodidesupporting

confidence: 66%

Study of phase changes in some iodides by the Hahn emanation technique

Narang¹,

Yaffe²

1968

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

Section: Mercuric Iodidesupporting

confidence: 66%

Study of phase changes in some iodides by the Hahn emanation technique

Narang¹,

Yaffe²

1968

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

“…From the X-ray structural investigations by Miyake, Hoshino & Takenaka (1952), Hoshino (1952Hoshino ( , 1954Hoshino ( , 1955Hoshino ( , 1957 and Miyake & Hoshino (1958) on powder specimens of CuI and CuBr, it appears that the cuprous halides exhibit 'structural disorder' quite similar to that proposed for fl-AgI by Helmoholz (1935) and for c~-AgI by Strock (1936). Although the zincblende type of structure is accepted for the y-phases, analysis of integrated intensities invariably yields high values for the cation mean square displacements (u 2) at both room and elevated temperatures.…”

Section: Introductionmentioning

confidence: 67%

Neutron diffraction study of partial radial densities in γ-CuCl, including an appendix on the effect of instrumental resolution on radial density analysis

Schreurs¹,

Mueller²,

Schwartz³

1976

Acta Cryst Sect A

View full text Add to dashboard Cite

Neutron diffraction has been used to study the structural disorder in ~,-CuC1 at 25 and 366°C. Powder patterns of 63CuNC1, NCuNC1 and 65CuNCI (N= natural abundance) were treated by integrated intensity (II) and radial density (RD) analyses. Using II, a satisfactory fit to these 366°C data was made with the anharmonic model described by Sakata, Hoshino & Harada [Acta Cryst. (1974). A30, 655-661]. This fit resulted in an anharmonic parameter flcu = 1.2 + 0.6 x 10-lz erg A,-3, which is in excellent agreement with the value of flcu = 1.15+0.66 x 10 -lz erg A, -3 obtained from a single-crystal study at room temperature by Sakata et al. (1974). To eliminate the indistinguishability of the anharmonic and statistically disordered models inherent in II, an energy analysis was made of the diffuse scattering. It was found that at 25 °C, 50 to 70 % of the diffuse scattering is elastic. The non-monotonic x dependence of this elastic diffuse scattering implies a model of correlated static displacements of Cu atoms and is inconsistent with the anharmonic model. Radial density analyses of the three spectra were fitted to a model based on harmonic vibration to obtain partial radial densities 0cucu, 0c~c~ and 0cuc~. Although the 0c~c~ was typical of that expected for a solid structure, ecuc, at 3660C was found to be more 'liquid-like'. Quantitative conclusions from this radial density analysis are limited by the strong dependence of the results on instrumental resolution. An estimate of the effect of instrumental resolution on the measured radial density function is contained in Appendix B.

show abstract

“…In connexion with the interesting ionic properties, the structural investigations of the phase transition in these crystals have been carried out using powder samples of CuI and CuBr (Miyake, Hoshino & Takenaka, 1952;Hoshino, 1952;Miyake & Hoshino, 1958). In these studies, an anomalous increase of a meansquare displacement (u 2) for copper atoms with increasing temperature was found from the analysis of measurements of the temperature dependence of X-ray Bragg intensities.…”

Section: Introductionmentioning

confidence: 99%

Neutron diffraction study of asymmetric anharmonic vibration of the copper atom in cuprous chloride

Sakata¹,

Hoshino²,

Harada³

1974

Acta Cryst Sect A

View full text Add to dashboard Cite

Neutron diffraction measurements of CuCI with the zincblende structure were carried out at room temperature and the results examined on the basis of three possible structure models: (1) harmonic thermal vibration of atoms, (2) asymmetric anharmonic vibrations and (3) statistical disorder arrangement of the copper atom. It was found that the anharmonic model was the most plausible for the structure of CuC1. The final R value in the least-squares analysis was 0.037. The parameters in the effective oneatomic-potential fields for the zincblende structure Vj(r) = 1 2 2 ... Voj + :r~s(ul + uz + u~) + Psu~u2u3 +were obtained as ~cu=0.74+0.01, ~c,=1.35+0.02x 10-nerg /~-2, and flcu=l'15+0.66, flc~=0.0+ 1.6 × 10-12erg A -3. It is also shown that the temperature dependence of the Bragg reflexion observed from room temperature to 523 °K can be explained very well with the use of the above parameters.

show abstract

On the Phase Transition in Cuprous Iodide

Cited by 171 publications

References 3 publications

Study of phase changes in some iodides by the Hahn emanation technique

Study of phase changes in some iodides by the Hahn emanation technique

Neutron diffraction study of partial radial densities in γ-CuCl, including an appendix on the effect of instrumental resolution on radial density analysis

Neutron diffraction study of asymmetric anharmonic vibration of the copper atom in cuprous chloride

Contact Info

Product

Resources

About