Enhanced photogeneration ofE′ centers from neutral oxygen vacancies in the presence of hydrogen in high-purity silica glass

1993 ◽  
Vol 48 (5) ◽  
pp. 2968-2973 ◽  
Author(s):  
Hiroyuki Nishikawa ◽  
Ryuta Nakamura ◽  
Yoshimichi Ohki ◽  
Yoshimasa Hama
Keyword(s):  
High Purity ◽  
Silica Glass ◽  
Oxygen Vacancies

Hydroxyl groups in high-purity silica glass

2000 ◽  
Vol 36 (4) ◽  
pp. 404-410 ◽  
Author(s):  
V. G. Plotnichenko ◽  
V. O. Sokolov ◽  
E. M. Dianov
Keyword(s):  
High Purity ◽  
Silica Glass ◽  
Hydroxyl Groups

Relation between the 1.9 eV luminescence and 4.8 eV absorption bands in high‐purity silica glass

1989 ◽  
Vol 54 (17) ◽  
pp. 1650-1652 ◽  
Author(s):  
Ryoichi Tohmon ◽  
Yasushi Shimogaichi ◽  
Shuji Munekuni ◽  
Yoshimichi Ohki ◽  
Yoshimasa Hama ◽  
...  
Keyword(s):  
High Purity ◽  
Silica Glass ◽  
Absorption Bands

Luminescence of different surface flaws in high purity silica glass under UV excitation

2011 ◽  
Author(s):  
J. Fournier ◽  
J. Néauport ◽  
P. Grua ◽  
V. Jubera ◽  
E. Fargin ◽  
...  
Keyword(s):  
High Purity ◽  
Silica Glass ◽  
Surface Flaws ◽  
Uv Excitation

Preparation of high purity, low water content fused silica glass

2001 ◽  
Vol 296 (1-2) ◽  
pp. 102-106 ◽  
Author(s):  
Minoru Tomozawa ◽  
Dong-Lae Kim ◽  
Victor Lou
Keyword(s):  
Water Content ◽  
High Purity ◽  
Silica Glass ◽  
Fused Silica ◽  
Fused Silica Glass

Exponential structural relaxation of a high purity silica glass

2008 ◽  
Vol 354 (40-41) ◽  
pp. 4685-4690 ◽  
Author(s):  
M. Tomozawa ◽  
A. Koike ◽  
S.-R. Ryu
Keyword(s):  
Structural Relaxation ◽  
High Purity ◽  
Silica Glass

scholarly journals Evidence of a green luminescence band related to surface flaws in high purity silica glass

2010 ◽  
Vol 18 (21) ◽  
pp. 21557 ◽  
Author(s):  
J. Fournier ◽  
J. Néauport ◽  
P. Grua ◽  
E. Fargin ◽  
V. Jubera ◽  
...  
Keyword(s):  
High Purity ◽  
Silica Glass ◽  
Luminescence Band ◽  
Green Luminescence ◽  
Surface Flaws

Doubly positively charged oxygen vacancies in silica glass

2009 ◽  
Vol 355 (18-21) ◽  
pp. 1103-1106 ◽  
Author(s):  
Anna V. Kimmel ◽  
Alexander L. Shluger
Keyword(s):  
Silica Glass ◽  
Oxygen Vacancies ◽  
Positively Charged

scholarly journals Na2co3 and Er2o3 Modified Lead Free Knn Piezoelectric Ceramic Obtained by Hot Pressing

2020 ◽  
Author(s):  
Paweł Rutkowski ◽  
Jan Huebner ◽  
Adrian Graboś ◽  
Dariusz Kata ◽  
Bogdan Sapiński
Keyword(s):  
Grain Growth ◽  
High Purity ◽  
Hot Pressing ◽  
Piezoelectric Ceramic ◽  
Oxygen Vacancies ◽  
Lead Free ◽  
Low Density ◽  
Sintering Aid ◽  
Protection Layer ◽  
Green Sample

Abstract Analysis of dense KNN ceramic obtained by hot pressing (HP) methodat 1100°C are presented in this paper. The synthesis of KNN-based piezoelectrics meets following challenges: low density of material, uncontrolled K/Na ratio, multiphase composition and formation of different KNN structures. Classical hot pressing approach results incontaminationby carbon originating from graphite moulds. The proposed h-BN protection layer between green sample and graphite mouldprevented carbon reaction with powder. Additionally, h-BN presence may decrease formation of oxygen vacancies which allows to maintain semiconductor features of KNN structure. Remaining issues were addressed with the addition of excess Na and Er2O3 doping. The results showed that excessNa addition allowed to compensate evaporation of sodium during the synthesis and sintering. Er2O3 was added as sintering aid to limit abnormal grain growth. The modification of amount of Na and Er2O3 addition resulted in high purity KNN samples with tetragonal structure andapparent density higher than 97%. Finally, piezoelectric features of prepared dense samples were measured and presented.

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