Abstract
Microstructure and microwave dielectric properties of (1 -x)NdGaO3-xCaTiO3 ceramics have been investigated. Crystal structure of all the specimens was orthorhombic and the lattice parameters decreased with an increase of x. For specimens with x ≤ 0.5, a Nd3Ga5O12 phase was observed. The Q value of Nd3Ga5O12 ceramics was about 10,000 at 12 GHz and the dielectric constant (∈r) was about 12. A liquid phase was found in the specimens with x ≥ 0.5, containing a high concentration of Ca and Ga ions. The dielectric constant and the temperature coefficient of resonant frequency (τf) of the specimens increased with an increase of x. The Q × f value of the NdGaO3 specimen was about 85,000 GHz and it decreased inversely with x. Excellent microwave dielectric properties of Q × f = 46, 000 GHz, ∈r = 45 and τf = -2.0 ppm/°C were obtained for (1 - x)NdGaO3-xCaTiO3 ceramic.
| Original language | English |
|---|---|
| Pages (from-to) | 717-721 |
| Number of pages | 5 |
| Journal | Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers |
| Volume | 41 |
| Issue number | 2 A |
| Publication status | Published - 2002 Feb 1 |
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Keywords
- CaTiO
- Dielectric properties
- Micro-structure
- Microwave ceramics
- NdGaO
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)
Cite this
Dielectric properties of (1 - x)NdGaO3-xCaTiO3 solid solution at microwave frequencies. / Kim, Min Han; Nahm, Sahn; Choi, Chang Hak; Lee, Hwack Joo; Park, Hyun Min.
In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 41, No. 2 A, 01.02.2002, p. 717-721.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Dielectric properties of (1 - x)NdGaO3-xCaTiO3 solid solution at microwave frequencies
AU - Kim, Min Han
AU - Nahm, Sahn
AU - Choi, Chang Hak
AU - Lee, Hwack Joo
AU - Park, Hyun Min
PY - 2002/2/1
Y1 - 2002/2/1
N2 - Microstructure and microwave dielectric properties of (1 -x)NdGaO3-xCaTiO3 ceramics have been investigated. Crystal structure of all the specimens was orthorhombic and the lattice parameters decreased with an increase of x. For specimens with x ≤ 0.5, a Nd3Ga5O12 phase was observed. The Q value of Nd3Ga5O12 ceramics was about 10,000 at 12 GHz and the dielectric constant (∈r) was about 12. A liquid phase was found in the specimens with x ≥ 0.5, containing a high concentration of Ca and Ga ions. The dielectric constant and the temperature coefficient of resonant frequency (τf) of the specimens increased with an increase of x. The Q × f value of the NdGaO3 specimen was about 85,000 GHz and it decreased inversely with x. Excellent microwave dielectric properties of Q × f = 46, 000 GHz, ∈r = 45 and τf = -2.0 ppm/°C were obtained for (1 - x)NdGaO3-xCaTiO3 ceramic.
AB - Microstructure and microwave dielectric properties of (1 -x)NdGaO3-xCaTiO3 ceramics have been investigated. Crystal structure of all the specimens was orthorhombic and the lattice parameters decreased with an increase of x. For specimens with x ≤ 0.5, a Nd3Ga5O12 phase was observed. The Q value of Nd3Ga5O12 ceramics was about 10,000 at 12 GHz and the dielectric constant (∈r) was about 12. A liquid phase was found in the specimens with x ≥ 0.5, containing a high concentration of Ca and Ga ions. The dielectric constant and the temperature coefficient of resonant frequency (τf) of the specimens increased with an increase of x. The Q × f value of the NdGaO3 specimen was about 85,000 GHz and it decreased inversely with x. Excellent microwave dielectric properties of Q × f = 46, 000 GHz, ∈r = 45 and τf = -2.0 ppm/°C were obtained for (1 - x)NdGaO3-xCaTiO3 ceramic.
KW - CaTiO
KW - Dielectric properties
KW - Micro-structure
KW - Microwave ceramics
KW - NdGaO
UR - http://www.scopus.com/inward/record.url?scp=0036478521&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0036478521&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0036478521
VL - 41
SP - 717
EP - 721
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 - 2 A
ER -