Mechanics of Fracture from Dislocation in Nano-scale Ceramics Single Crystal Specimen

2018 ◽  
Vol 2018.9 (0) ◽  
pp. 31pm2PN74
Author(s):  
Takashi Sumigawa ◽  
Takahiro Shimada ◽  
Yuki Mizuno ◽  
Shohei Hagiwara ◽  
Takayuki Kitamura
Keyword(s):  
Single Crystal ◽  
Nano Scale ◽  
Single Crystal Specimen

Reexamination of the crystal structure of semseyite, Pb9Sb8S21

2018 ◽  
Vol 233 (3-4) ◽  
pp. 279-284 ◽  
Author(s):  
Yoshitaka Matsushita
Keyword(s):  
Crystal Structure ◽  
Chemical Composition ◽  
Single Crystal ◽  
Structure Refinement ◽  
Unit Cell ◽  
Crystal Structure Refinement ◽  
Cell Level ◽  
Single Crystal Specimen ◽  
Cation Sites ◽  
Occupancy Behavior

AbstractThe crystal structure of semseyite, Pb9Sb8S21was successfully refined using a single-crystal specimen from Wolfsberg, Harz, Germany, having chemical composition (EPMA) Pb9.01(1)Sb8.00(3)S21.05(5). The structure belongs to the monoclinicC2/cspace group (a=13.6267(10) Å,b=11.9742(9) Å,c=24.5891(18) Å,β=105.997(3)°,V=3856.8(5) Å3,Z=4,Dc=6.048 g/cm3). Crystal structure refinement with all atoms refined anisotropically converged toR1=4.64% (I>2σ(I)). The crystal structure is built of two subunits (A and B) showing TlSbS2-like topology. Each of them stacks parallel to (001), andc/2 in thickness. Two cation sites (Pb1 and Sb5) located at central part of the subunit, show mixed occupancy behavior as 95% Pb and 5% Sb at the Pb5 site, and 95% Sb and 5% Pb at the Sb1 site, respectively. Each of subunits are related by unit cell-level twinning mechanism “tropochemical cell twinning” with the TlSbS2-like subunits alternatively parallel to (1 1 −4) and (−1 1 4) planes.

Evaluation of fracture strength of nano-scale SrTiO3 single crystal with sessile dislocation

2017 ◽  
Vol 2017 (0) ◽  
pp. OS1512
Author(s):  
Hiroki UNNO ◽  
Yuki MIZUNO ◽  
Takashi SUMIGAWA ◽  
Takayuki KITAMURA
Keyword(s):  
Single Crystal ◽  
Fracture Strength ◽  
Nano Scale
Sign in / Sign up

Export Citation Format

Share Document