文档介绍：Journal of the European Ceramic Society 23 (2003) 2589–2592
ate/jeurceramsoc
Microwave dielectric properties of Ca2P2O7
Jian-jiang Bian, Dong-Wan Kim, Kug Sun Hong*
School of Materials Science and Engineering, College of Engineering, Seoul National University, Seoul, South Korea
Abstract
Microwave dielectric properties of - and b-Ca2P2O7 ceramic materials were investigated, by work analyzer at the frequency
of 10 GHz. It was found that b-Ca2P2O7 could be sintered at 1150 C for 2 h with high bulk density (98% TD) and -Ca2P2O7
could be sintered at 1290 C/4h with bulk density of % TD. The dielectric constant ("r)ofb-Ca2P2O7 sintered at 1150 C/2his
, the temperature coefficient of resonant frequency ( f)isÀ53 ppm/ C, and the QÂf value is 53,500 GHz. -Ca2P2O7 sintered at
1290 C/4 h has "r of , f of À97 ppm/ C and QÂf value of 14,115 GHz.
# 2003 Elsevier Ltd. All rights reserved.
Keywords: Bond valence; Calcium pyrophosphate; Microwave dielectric properties
1. Introduction Lattice parameters of the two crystal phases are listed
in Table 1. The crystal structures of and b-Ca2P2O7
With the rapid development of modern microwave generated using the ATOMS software developed by
8
communication system, such as mobile telephones, high Eric Dowty, are shown in Fig. 1. b-Ca2P2O7 is tetra-
quality microwave dielectric ceramics have att