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/

Zendy Plus

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

Zendy Tools

Zendy Open

It has been proposed that single crystals of phenothiazine undergo a proper ferroelastic phase transition: Pnma(${\mathit{D}}_{2\mathit{h}}$)\ensuremath{\rightarrow}P${2}_{1}$/c(${\mathit{C}}_{2\mathit{h}}$). This premise is in conflict with Brillouin-scattering studies from both quasi- and high-symmetry longitudinal and transverse acoustic modes reported here. The ${\mathit{C}}_{55}$ elastic constant of phenothiazine as an orthorhombic crystal at ambient conditions shows no temperature dependence. The inelastic, light-scattering spectra support an order-disorder phase transition; no significantly unstable acoustic phonons were observed through the phase transition. Laser diffraction from structural domains reveals that the crystal is polysynthetically twinned above and below ${\mathit{T}}_{\mathit{c}}$. At room temperature, domain walls are made indistinct by disorder but become visible as the sample is cooled. Stress-strain hysteresis below ${\mathit{T}}_{\mathit{c}}$ is attributed to a ferrobielastic effect.

Brillouin-scattering study of the elastic constants of phenothiazine through the phase transition