A 69Ga, 115In NQR study of polytypes of GaS, GaSe and InSe

Abstract Pulsed Fourier transform NQR spectroscopy has been used to study polytypism in the monochalcogenides GaS, GaSe and InSe at 77 K. The spectrum of GaS was consistent with a major contribution from the β phase but showed evidence of higher polytypes, possibly due to ϵ or γ type faulting. The GaSe spectrum is simply interpreted as an equal mixture of ϵ and γ types. The four InSe spectra ( I = 9 2 115 In), showed a multiplicity of lines. The sharpness of the NQR lines of all spectra suggests the existence of regions with a hitherto overlooked high degree of order.

[1]  R. Lieth,et al.  Structures and compounds in the system Ga1−xSex , 1972 .

[2]  S. Popović,et al.  The synthesis of In5Se6 and In2Se from InSe by zone-melting process , 1974 .

[3]  R. Chevalier,et al.  Atomic structure of a 4H GaSe polytype named δ‐type , 1975 .

[4]  R. Lieth,et al.  Preparation and crystallography of gallium sulfide–selenide solid solutions , 1971 .

[5]  Mickael Martin,et al.  Large InSe monocrystals grown from a non-stoichiometric melt , 1977 .

[6]  A. Chevy,et al.  Crystal structure and interatomic distances in GaSe , 1975 .

[7]  P. Goodman,et al.  The space‐group determination of GaS and Cu3As2S3I by convergent‐beam electron diffraction , 1980 .

[8]  E. Mooser,et al.  Excitons in GaSe polytypes , 1967 .

[9]  A. Likforman,et al.  Structure cristalline du monoséléniure d'indium InSe , 1975 .

[10]  M. Schlüter,et al.  Electrons and phonons in layered crystal structures , 1979 .

[11]  T. Bastow,et al.  Nuclear quadrupole resonance of 69Ga and 115In in chalcogenides MX and M2X3 , 1975 .

[12]  H. S. Gutowsky,et al.  Temperature Dependence of the Chlorine Pure Quadrupole Resonance Frequency in Molecular Crystals , 1960 .

[13]  S. Jandl,et al.  Neutron scattering measurements of the interlayer interaction in GaSe , 1973 .

[14]  G. Frank,et al.  Über die Kristallstruktur des GaS , 1955 .

[15]  S. Segel Nuclear electric hexadecapole interactions in solids , 1978 .

[16]  H. Hahn,et al.  Zur Polytypie des Galliummonoselenids, GaSe , 1961 .