Low-temperature sintering of temperature-stable LaNbO4 microwave dielectric ceramics

Hang Won Lee, Jeong Hyun Park, Sahn Nahm, Dong-Wan Kim, Jae Gwan Park

Research output: Contribution to journalArticle

35 Citations (Scopus)

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 languageEnglish
Pages (from-to)21-24
Number of pages4
JournalMaterials Research Bulletin
Volume45
Issue number1
DOIs
Publication statusPublished - 2010 Jan 1

Fingerprint

sintering
Sintering
Microwaves
ceramics
microwaves
Temperature
phase transformations
temperature
resonant frequencies
dielectric properties
Q factors
Focused ion beams
ion beams
Dielectric properties
electron energy
permittivity
Energy dispersive spectroscopy
Natural frequencies
transmission electron microscopy
microstructure

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 journalArticle

Lee, Hang Won ; Park, Jeong Hyun ; Nahm, Sahn ; Kim, Dong-Wan ; Park, Jae Gwan. / Low-temperature sintering of temperature-stable LaNbO4 microwave dielectric ceramics. In: Materials Research Bulletin. 2010 ; Vol. 45, No. 1. pp. 21-24.
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