English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The high temperature modifications  β -SnS and  β -SnSe crystallize in the orthorhombic TlI-type structure [ Cmcm , No. 63; SnS at 905 K:  a  = 4.148(2),  b  = 11.480(5),  c  = 4.177(2) Å; SnSe at 825 K:  a  = 4.410(6),  b  = 11.705(7),  c  = 4.318(4) Å]. For the  λ -type phase transition  α  →  β  from the GeS-type (B16) to the TlI-type (B33) the atomic shifts were determined from about 200° below the critical temperature to  T c   (878 K and 807 K). They show a continuous transition from threefold to fivefold bonded atoms. This change in topology and bond character corresponds to the model of a S N 2 chemical reaction. There is an indication of a possible first-order transition near  T c  .

The high temperature structure of β -SnS and β -SnSe and the B16-to-B33 type λ -transition path