Elastic properties of polycrystalline Gd₂O

Abstract

A r e s o n a n t .frequency t e c h n i q u e was u s e d t o d e t e r m i n e t h e e f f e c t . t h a t t e m p e r a t u r e and p o r o s i t y have on t h e e1asti.c p r o p e r t i e s , o f g a d o l i n i a , w h i l e t h e t e m p e r a t u r e dependence o f t h e r m a l d i f f u s i v i t y was i n v e s t i g a t e d by a f l a s h method.Young's . . modulus, s h e a r modulus, and P o i s s o n ' s r a t i o were s t u d i e d from 2.48% t o 36.78% p o r o s i t y t o y i e l d p o r o s i t y dependence c u r v e s , w i t h t h e e x t r a p o l a t e d 0 % p o r o s i t y v a l u e s e n a b l i n g t h e c a l c u l a t 2 o n of t h e Debye t e m p e r a t u r e . S e l e c t e d spec-imenswere chosen t o be a n a l y z e d from room t e m p e r a t u r e t o 135Z°C t o d e t e r m i n e c u r v e s f o r the' t e m p e r a t u r e 'dependence o f , Young's . .modulus, s h e a r modulus, Poi.ss,onts r a t i -o , bulk' modu'lus,. and t h e f i r s t -(y) and second' ( 8 ) .Griinefsen c o n s t a n t s .

Elastic Properties of Model Porous Ceramics

“…Hunter et al [36,37,38,39] have studied the Young's modulus of several different oxides. In all cases, the porous material was created by sintering a powder of the pure oxide.…”

“…Micrographs of the ceramic indicate a granular structure similar to that of the model microstructure (although the grains appear more like polyhedra, not spheres). [36,37,38,39] compared with the FEM theories for overlapping spherical pores (--), and overlapping solid spheres (---). Sm [40].…”

“…Figure 11: Data for various oxides measured by Hunter et al[36,37,38,39] compared with the FEM theories for overlapping spherical pores (--), and overlapping solid spheres (---). Sm 2 O 3[36] E s =145 GPa (⋄); Lu 2 O 3 [37] E s =193 GPa (∆); Gd 2 O 3 [38] E s =150 GPa (•); HfO 2 [39] E s =246 GPa (2);…”