Abstract
The sintering behaviors and microwave dielectric properties of V 2O5-added and -substituted ZnNb2O6, ceramics with columbite structure (abbreviated as ZNV and ZVN, respectively) have been investigated. It was found that the addition or substitution of V 2O5 to ZnNb2O6 ceramics lowers the sintering temperature from 1150°C to ∼900°C, but the sintering mechanisms are different. The formation of a ternary liquid phase is attributed to enhanced sintering in ZNV samples. Interaction between ZnNb2O 6 and V2O5 also led to the formation of a second phase, V3Nb17O50. In contrast, it has been observed that with up to 8 mol% substitution of V2O5 in ZnNb2O6, a complete solid solution is formed. The sintering temperature for the ZVN sample becomes lower due to the decreased temperature of liquidus according to the substitution of V for Nb ions. The microwave dielectric properties of ZNV samples are seriously degraded due to the presence of a V3Nb17O50 second phase. This was confirmed by measuring the dielectric properties of V3Nb 17O50 second phase. However, V-substituted Zn(Nb 0.94V0.06)2O6 samples sintered at 875°C for 2 h exhibit excellent microwave dielectric properties: Q × f of 65,000 GHz, εr of 24, and τf of -72 ppm/°C.
| Original language | English |
|---|---|
| Pages (from-to) | 3511-3515 |
| Number of pages | 5 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 43 |
| Issue number | 6 A |
| Publication status | Published - 2004 Jun 1 |
| Externally published | Yes |
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Keywords
- Columbite ZnNbO
- Dielectric properties
- Low-temperature sintering
- Microwave
- VO
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
Low-temperature sintering of V2O5-added and -substituted ZnNb2O6 microwave ceramics. / Wee, Sung Hun; Kim, Dong-Wan; Yoo, Sang Im; Hong, Kug Sun.
In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 43, No. 6 A, 01.06.2004, p. 3511-3515.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low-temperature sintering of V2O5-added and -substituted ZnNb2O6 microwave ceramics
AU - Wee, Sung Hun
AU - Kim, Dong-Wan
AU - Yoo, Sang Im
AU - Hong, Kug Sun
PY - 2004/6/1
Y1 - 2004/6/1
N2 - The sintering behaviors and microwave dielectric properties of V 2O5-added and -substituted ZnNb2O6, ceramics with columbite structure (abbreviated as ZNV and ZVN, respectively) have been investigated. It was found that the addition or substitution of V 2O5 to ZnNb2O6 ceramics lowers the sintering temperature from 1150°C to ∼900°C, but the sintering mechanisms are different. The formation of a ternary liquid phase is attributed to enhanced sintering in ZNV samples. Interaction between ZnNb2O 6 and V2O5 also led to the formation of a second phase, V3Nb17O50. In contrast, it has been observed that with up to 8 mol% substitution of V2O5 in ZnNb2O6, a complete solid solution is formed. The sintering temperature for the ZVN sample becomes lower due to the decreased temperature of liquidus according to the substitution of V for Nb ions. The microwave dielectric properties of ZNV samples are seriously degraded due to the presence of a V3Nb17O50 second phase. This was confirmed by measuring the dielectric properties of V3Nb 17O50 second phase. However, V-substituted Zn(Nb 0.94V0.06)2O6 samples sintered at 875°C for 2 h exhibit excellent microwave dielectric properties: Q × f of 65,000 GHz, εr of 24, and τf of -72 ppm/°C.
AB - The sintering behaviors and microwave dielectric properties of V 2O5-added and -substituted ZnNb2O6, ceramics with columbite structure (abbreviated as ZNV and ZVN, respectively) have been investigated. It was found that the addition or substitution of V 2O5 to ZnNb2O6 ceramics lowers the sintering temperature from 1150°C to ∼900°C, but the sintering mechanisms are different. The formation of a ternary liquid phase is attributed to enhanced sintering in ZNV samples. Interaction between ZnNb2O 6 and V2O5 also led to the formation of a second phase, V3Nb17O50. In contrast, it has been observed that with up to 8 mol% substitution of V2O5 in ZnNb2O6, a complete solid solution is formed. The sintering temperature for the ZVN sample becomes lower due to the decreased temperature of liquidus according to the substitution of V for Nb ions. The microwave dielectric properties of ZNV samples are seriously degraded due to the presence of a V3Nb17O50 second phase. This was confirmed by measuring the dielectric properties of V3Nb 17O50 second phase. However, V-substituted Zn(Nb 0.94V0.06)2O6 samples sintered at 875°C for 2 h exhibit excellent microwave dielectric properties: Q × f of 65,000 GHz, εr of 24, and τf of -72 ppm/°C.
KW - Columbite ZnNbO
KW - Dielectric properties
KW - Low-temperature sintering
KW - Microwave
KW - VO
UR - http://www.scopus.com/inward/record.url?scp=4344563217&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=4344563217&partnerID=8YFLogxK
M3 - Article
VL - 43
SP - 3511
EP - 3515
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 6 A
ER -