Abstract
We demonstrate the correlation between sintering behavior and microstructural observations in low-temperature sintered, LaNbO4 microwave ceramics. Small CuO additions to LaNbO4 significantly lowered the sintering temperature from 1250 to 950 °C. To elucidate the sintering mechanism, the internal microstructure of the sample manipulated by a focused ion beam (FIB) was investigated using transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS). LaNbO4 with 3 wt% CuO sintered at 950 °C for 2 h possessed the following excellent microwave dielectric properties: a quality factor (Qxf) of 49,000 GHz, relative dielectric constant (εr) of 19.5, and temperature coefficient of resonant frequency (τf) of 1 ppm/°C. The ferroelastic phase transformation was also investigated using in situ X-ray diffraction (XRD) to explain the variation of τf in low-temperature sintered LaNbO4 as a function of CuO content.
| Original language | English |
|---|---|
| Pages (from-to) | 21-24 |
| Number of pages | 4 |
| Journal | Materials Research Bulletin |
| Volume | 45 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2010 Jan 1 |
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Keywords
- A. Ceramics
- A. Oxides
- C. Electron microscopy
- D. Dielectric properties
- D. Microstructure
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanical Engineering
- Mechanics of Materials
Cite this
Low-temperature sintering of temperature-stable LaNbO4 microwave dielectric ceramics. / Lee, Hang Won; Park, Jeong Hyun; Nahm, Sahn; Kim, Dong-Wan; Park, Jae Gwan.
In: Materials Research Bulletin, Vol. 45, No. 1, 01.01.2010, p. 21-24.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low-temperature sintering of temperature-stable LaNbO4 microwave dielectric ceramics
AU - Lee, Hang Won
AU - Park, Jeong Hyun
AU - Nahm, Sahn
AU - Kim, Dong-Wan
AU - Park, Jae Gwan
PY - 2010/1/1
Y1 - 2010/1/1
N2 - We demonstrate the correlation between sintering behavior and microstructural observations in low-temperature sintered, LaNbO4 microwave ceramics. Small CuO additions to LaNbO4 significantly lowered the sintering temperature from 1250 to 950 °C. To elucidate the sintering mechanism, the internal microstructure of the sample manipulated by a focused ion beam (FIB) was investigated using transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS). LaNbO4 with 3 wt% CuO sintered at 950 °C for 2 h possessed the following excellent microwave dielectric properties: a quality factor (Qxf) of 49,000 GHz, relative dielectric constant (εr) of 19.5, and temperature coefficient of resonant frequency (τf) of 1 ppm/°C. The ferroelastic phase transformation was also investigated using in situ X-ray diffraction (XRD) to explain the variation of τf in low-temperature sintered LaNbO4 as a function of CuO content.
AB - We demonstrate the correlation between sintering behavior and microstructural observations in low-temperature sintered, LaNbO4 microwave ceramics. Small CuO additions to LaNbO4 significantly lowered the sintering temperature from 1250 to 950 °C. To elucidate the sintering mechanism, the internal microstructure of the sample manipulated by a focused ion beam (FIB) was investigated using transmission electron microscopy (TEM) and energy-dispersive spectroscopy (EDS). LaNbO4 with 3 wt% CuO sintered at 950 °C for 2 h possessed the following excellent microwave dielectric properties: a quality factor (Qxf) of 49,000 GHz, relative dielectric constant (εr) of 19.5, and temperature coefficient of resonant frequency (τf) of 1 ppm/°C. The ferroelastic phase transformation was also investigated using in situ X-ray diffraction (XRD) to explain the variation of τf in low-temperature sintered LaNbO4 as a function of CuO content.
KW - A. Ceramics
KW - A. Oxides
KW - C. Electron microscopy
KW - D. Dielectric properties
KW - D. Microstructure
UR - http://www.scopus.com/inward/record.url?scp=70449127059&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=70449127059&partnerID=8YFLogxK
U2 - 10.1016/j.materresbull.2009.09.008
DO - 10.1016/j.materresbull.2009.09.008
M3 - Article
AN - SCOPUS:70449127059
VL - 45
SP - 21
EP - 24
JO - Materials Research Bulletin
JF - Materials Research Bulletin
SN - 0025-5408
IS - 1
ER -