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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The type B structure of the single rare earth element disilicates has been revised using room temperature and pressure single-crystal X-ray diffraction measurements on Gd 2 Si 2 O 7 , Tb 2 Si 2 O 7  and Ho 2 Si 2 O 7  synthesized at 2–2.5 GPa, 1400–1500 °C in a piston-cylinder apparatus and Dy 2 Si 2 O 7  synthesized hydrothermally at 0.1 GPa. Crystal data are: triclinic, space group  P 1̅,  Z  = 4; Gd 2 Si 2 O 7  –  a  = 6.6609(2),  b  = 6.7081(2),  c  = 12.1390(4) Å,  α  = 94.277(1),  β  = 90.577(1),  γ  = 91.441(1)°,  R  = 0.033, and  D x   = 5.929 g/cm 3 ; Tb 2 Si 2 O 7  –  a  = 6.6331(3),  b  = 6.6799(2),  c  = 12.0967(2) Å,  α  = 94.128(1),  β  = 90.609(2),  γ  = 91.541(1)°,  R  = 0.038, and  D x   = 6.041 g/cm 3 ; Dy 2 Si 2 O 7  –  a  = 6.6158(2),  b  = 6.6604(2),  c  = 12.0551(4) Å,  α  = 94.373(2),  β  = 90.836(2),  γ  = 91.512(2)°,  R  = 0.031, and  D x   = 6.156 g/cm 3 ; and Ho 2 Si 2 O 7  –  a  = 6.5960(2),  b  = 6.6328(3),  c  = 12.0214(6) Å,  α  = 94.479(1),  β  = 90.856(1),  γ  = 91.749(2)°,  R  = 0.034, and  D x   = 6.313 g/cm 3 . Substitution of Gd 3+ , Tb 3+ , Dy 3+ , and Ho 3+  cations into the type B structure results in proportional linear decrease in size of the REEO n  polyhedra and unit-cell parameters, and leaves the silicate stereochemistry essentially unchanged.

Rare earth disilicates R 2 Si 2 O 7 ( R = Gd, Tb, Dy, Ho): type B