The formation of "dark holes" and their significant influences on microwave dielectric properties of Ba4.2Nd9.2Ti18O54 ceramics

Baoyu Huang; Xiaochi Lu; Yan Zhang; Lixi Wang; Zhenxiao Fu; Zhefei Wang; Qitu Zhang

doi:10.1016/j.matchar.2015.11.016

The formation of "dark holes" and their significant influences on microwave dielectric properties of Ba_4.2Nd_9.2Ti₁₈O₅₄ ceramics

Baoyu Huang, Xiaochi Lu, Yan Zhang, Lixi Wang, Zhenxiao Fu, Zhefei Wang, Qitu Zhang

College of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

Ba_4.2Nd_9.2Ti₁₈O₅₄ (BNT) ceramics have been prepared by solid-state ceramic method. Dark holes were observed in the center of the ceramics. All the samples showed typical columnar grain morphology in SEM images. TEM and XRD analysis indicated that there was only a BaNd₂Ti₄O₁₂ (JCPDS Card No. 44-0061) phase in the ceramics. In HRTEM images, the grain boundary was clear and no impurities and defects were observed. The XPS results showed the difference in valence of Ti. Ti^{3 +} ions appeared in all the samples. The Q × f value significantly dropped when the amount of Ti^{3 +} ions was considerable. BNT ceramics sintered at high temperature (1300°C to 1400°C) usually contain dark holes in the center (caused by Ti^{3 +} ions) which could lead to a significant drop in Q × f value.

Original language	English
Pages (from-to)	81-85
Number of pages	5
Journal	Materials Characterization
Volume	111
DOIs	https://doi.org/10.1016/j.matchar.2015.11.016
State	Published - Jan 2016

Keywords

BaNdTiO
Ceramic
Microwave dielectric properties
Oxygen vacancy
TEM
XPS

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10.1016/j.matchar.2015.11.016

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title = "The formation of {"}dark holes{"} and their significant influences on microwave dielectric properties of Ba4.2Nd9.2Ti18O54 ceramics",

abstract = "Ba4.2Nd9.2Ti18O54 (BNT) ceramics have been prepared by solid-state ceramic method. Dark holes were observed in the center of the ceramics. All the samples showed typical columnar grain morphology in SEM images. TEM and XRD analysis indicated that there was only a BaNd2Ti4O12 (JCPDS Card No. 44-0061) phase in the ceramics. In HRTEM images, the grain boundary was clear and no impurities and defects were observed. The XPS results showed the difference in valence of Ti. Ti3 + ions appeared in all the samples. The Q × f value significantly dropped when the amount of Ti3 + ions was considerable. BNT ceramics sintered at high temperature (1300°C to 1400°C) usually contain dark holes in the center (caused by Ti3 + ions) which could lead to a significant drop in Q × f value.",

keywords = "BaNdTiO, Ceramic, Microwave dielectric properties, Oxygen vacancy, TEM, XPS",

author = "Baoyu Huang and Xiaochi Lu and Yan Zhang and Lixi Wang and Zhenxiao Fu and Zhefei Wang and Qitu Zhang",

year = "2016",

month = jan,

doi = "10.1016/j.matchar.2015.11.016",

language = "英语",

volume = "111",

pages = "81--85",

journal = "Materials Characterization",

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T1 - The formation of "dark holes" and their significant influences on microwave dielectric properties of Ba4.2Nd9.2Ti18O54 ceramics

AU - Huang, Baoyu

AU - Lu, Xiaochi

AU - Zhang, Yan

AU - Wang, Lixi

AU - Fu, Zhenxiao

AU - Wang, Zhefei

AU - Zhang, Qitu

PY - 2016/1

Y1 - 2016/1

N2 - Ba4.2Nd9.2Ti18O54 (BNT) ceramics have been prepared by solid-state ceramic method. Dark holes were observed in the center of the ceramics. All the samples showed typical columnar grain morphology in SEM images. TEM and XRD analysis indicated that there was only a BaNd2Ti4O12 (JCPDS Card No. 44-0061) phase in the ceramics. In HRTEM images, the grain boundary was clear and no impurities and defects were observed. The XPS results showed the difference in valence of Ti. Ti3 + ions appeared in all the samples. The Q × f value significantly dropped when the amount of Ti3 + ions was considerable. BNT ceramics sintered at high temperature (1300°C to 1400°C) usually contain dark holes in the center (caused by Ti3 + ions) which could lead to a significant drop in Q × f value.

AB - Ba4.2Nd9.2Ti18O54 (BNT) ceramics have been prepared by solid-state ceramic method. Dark holes were observed in the center of the ceramics. All the samples showed typical columnar grain morphology in SEM images. TEM and XRD analysis indicated that there was only a BaNd2Ti4O12 (JCPDS Card No. 44-0061) phase in the ceramics. In HRTEM images, the grain boundary was clear and no impurities and defects were observed. The XPS results showed the difference in valence of Ti. Ti3 + ions appeared in all the samples. The Q × f value significantly dropped when the amount of Ti3 + ions was considerable. BNT ceramics sintered at high temperature (1300°C to 1400°C) usually contain dark holes in the center (caused by Ti3 + ions) which could lead to a significant drop in Q × f value.

KW - BaNdTiO

KW - Ceramic

KW - Microwave dielectric properties

KW - Oxygen vacancy

KW - TEM

KW - XPS

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U2 - 10.1016/j.matchar.2015.11.016

DO - 10.1016/j.matchar.2015.11.016

M3 - 文章

AN - SCOPUS:84951851660

SN - 1044-5803

VL - 111

SP - 81

EP - 85

JO - Materials Characterization

JF - Materials Characterization

ER -

The formation of "dark holes" and their significant influences on microwave dielectric properties of Ba_4.2Nd_9.2Ti₁₈O₅₄ ceramics

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Keywords

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