2008
DOI: 10.1080/10584580802558134
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Influence of Monoxides Addition on Sintering of Sodium-Potassium Niobates Solid Solution

Abstract: In this paper the preparation, structure and dielectric parameters of ceramics from different powders of pure potassium sodium niobate (KNN) and KNN doped with 1.0 wt% of Li 2 O, CdO, Bi 2 O 3 , MnO 2 , V 2 O 5 and WO 3 have been studied. The dopping of sintering aids did not affect the crystallographic structure of the ceramics significantly; all ceramic samples had a single-phase perovskite structure. Added elements Li 2 O, CdO, MnO 2 , V 2 O 5 effectively decreased the sintering temperature of KNN (50 • -80… Show more

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Cited by 2 publications
(5 citation statements)
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“…Sintering aids can improve the electrical properties of KNN materials by the improvement in the densification and microstructure. ,,,, In recent decades, many aids have been used to sinter KNN ceramics (refs , , , , , , , and ), including K 4 CuNb 8 O 23 (KCN), K 5.4 CuTa 10 O 29 (KCT), ,, K 1.94 ­Zn 1.06 ­Ta 5.19 O 15 (KZT), CuNb 2 O 6 , CuO, , , Mn 3 O 4 , MnO 2 , , MoO 3 , ZnO, La 2 O 3 , Bi 2 O 3 , ,, Fe 2 O 3 , , V 2 O 5 , and ZrO 2 . Sintering aids have two main advantages for KNN materials: (i) improving the density, such as KZT, KCN, etc.…”
Section: Type and Construction Of Phase Boundariesmentioning
confidence: 99%
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“…Sintering aids can improve the electrical properties of KNN materials by the improvement in the densification and microstructure. ,,,, In recent decades, many aids have been used to sinter KNN ceramics (refs , , , , , , , and ), including K 4 CuNb 8 O 23 (KCN), K 5.4 CuTa 10 O 29 (KCT), ,, K 1.94 ­Zn 1.06 ­Ta 5.19 O 15 (KZT), CuNb 2 O 6 , CuO, , , Mn 3 O 4 , MnO 2 , , MoO 3 , ZnO, La 2 O 3 , Bi 2 O 3 , ,, Fe 2 O 3 , , V 2 O 5 , and ZrO 2 . Sintering aids have two main advantages for KNN materials: (i) improving the density, such as KZT, KCN, etc.…”
Section: Type and Construction Of Phase Boundariesmentioning
confidence: 99%
“…It is clear that a pure KNN ceramic sintered in air has a lower density than one sintered by SPS or hot press methods; ,,, thus, higher d 33 values are shown by SPS or hot-pressed samples due to the improved density. , In the past decade, some methods (e.g., sintering temperature, ,,, , rapid sintering technique, ,,, the use of sintering aids (refs , , , , , and ), and sintering atmosphere ) have been used to improve the density of KNN ceramics. Among these methods, the main goal is to suppress the loss of alkali metals ,,,, ,,,, or the formation of liquid phases ,,,, …”
Section: Type and Construction Of Phase Boundariesmentioning
confidence: 99%
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“…Abnormal grain growth, reduction in the mean grain size, and development of bimodal grain size distributions resulting from the continuous addition of Li 2 CO 3 and Bi 2 O 3 are in reasonable agreement with a continuous decrease in Δ μ C . [ 66–68 ] On the other hand, very small grains in the sample with excess sintering aid (0.3 mol% Li 2 CO 3 + 0.3 mol% Bi 2 O 3 ) are due to a very slow grain growth rate, suggesting that the driving forces for many grains are higher than the critical driving force, causing grain growth behavior to change to pseudonormal, which also slows down single‐crystal growth [ 35,58 ] [Figure 1e”]. Segregation of excess Bi at the grain boundaries may also be a reason for the slow grain growth rate due to an increase in the thickness of the solid/liquid interface across which atoms must diffuse.…”
Section: Resultsmentioning
confidence: 99%