Preferred Label : polytypic transition;
IUPAC definition : A transition of a crystalline structure into one or more forms which differ in the
way identical layers of atoms are stacked. Example: ZnS consists of two identical
close packings, one of Zn atoms, the other S atoms, with the one displaced to the
other along the i c /i -axis through one-quarter of the layer spacing. In sphalerite-type
ZnS the layers have the face-centred-cubic (ABC ABC) sequence, in wurtzite-type ZnS
they have the hexagonal-close-packed (AB AB) sequence. The transition of sphalerite-type
ZnS to wurtzite-type ZnS occurs at 1297 K.;
Origin ID : P04756;
See also
A transition of a crystalline structure into one or more forms which differ in the
way identical layers of atoms are stacked. Example: ZnS consists of two identical
close packings, one of Zn atoms, the other S atoms, with the one displaced to the
other along the i c /i -axis through one-quarter of the layer spacing. In sphalerite-type
ZnS the layers have the face-centred-cubic (ABC ABC) sequence, in wurtzite-type ZnS
they have the hexagonal-close-packed (AB AB) sequence. The transition of sphalerite-type
ZnS to wurtzite-type ZnS occurs at 1297 K.
