Abstract

Commercial manufacturers add transition metals and other impurities to high performance microwave ceramic compounds to improve their manufacturability. Measurements of microwave loss tangent were performed on Ba(Zn 1/3Ta2/3)O3, ZrTiO4-ZnNb 2O6, Ba(Zn1/3Nb2/3)O3, and BaTi4O9-BaZn2Ti4O11 ceramics. A marked increase in the loss at low temperatures is found in materials containing transition metal with unpaired d-electrons as a result of resonant spin excitations in isolated atoms (light doping) or exchange coupled clusters (moderate to high doping). The loss tangent can be drastically reduced by applying static magnetic fields. Our measurements also show that this mechanism significantly contributes to room temperature loss, but does not dominate.

Original languageEnglish (US)
Article number252901
JournalApplied Physics Letters
Volume101
Issue number25
DOIs
StatePublished - Dec 17 2012

Fingerprint

cryogenic temperature
ceramics
microwaves
tangents
transition metals
impurities
room temperature
magnetic fields
excitation
atoms
electrons

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

Cite this

The dominance of paramagnetic loss in microwave dielectric ceramics at cryogenic temperatures. / Liu, Lingtao; Matusevich, Alena; Garg, Chirag; Newman, Nathan.

In: Applied Physics Letters, Vol. 101, No. 25, 252901, 17.12.2012.

Research output: Contribution to journalArticle

@article{352ebd1287014017ab625a0ac58284f4,
title = "The dominance of paramagnetic loss in microwave dielectric ceramics at cryogenic temperatures",
abstract = "Commercial manufacturers add transition metals and other impurities to high performance microwave ceramic compounds to improve their manufacturability. Measurements of microwave loss tangent were performed on Ba(Zn 1/3Ta2/3)O3, ZrTiO4-ZnNb 2O6, Ba(Zn1/3Nb2/3)O3, and BaTi4O9-BaZn2Ti4O11 ceramics. A marked increase in the loss at low temperatures is found in materials containing transition metal with unpaired d-electrons as a result of resonant spin excitations in isolated atoms (light doping) or exchange coupled clusters (moderate to high doping). The loss tangent can be drastically reduced by applying static magnetic fields. Our measurements also show that this mechanism significantly contributes to room temperature loss, but does not dominate.",
author = "Lingtao Liu and Alena Matusevich and Chirag Garg and Nathan Newman",
year = "2012",
month = "12",
day = "17",
doi = "10.1063/1.4772491",
language = "English (US)",
volume = "101",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "25",

}

TY - JOUR

T1 - The dominance of paramagnetic loss in microwave dielectric ceramics at cryogenic temperatures

AU - Liu, Lingtao

AU - Matusevich, Alena

AU - Garg, Chirag

AU - Newman, Nathan

PY - 2012/12/17

Y1 - 2012/12/17

N2 - Commercial manufacturers add transition metals and other impurities to high performance microwave ceramic compounds to improve their manufacturability. Measurements of microwave loss tangent were performed on Ba(Zn 1/3Ta2/3)O3, ZrTiO4-ZnNb 2O6, Ba(Zn1/3Nb2/3)O3, and BaTi4O9-BaZn2Ti4O11 ceramics. A marked increase in the loss at low temperatures is found in materials containing transition metal with unpaired d-electrons as a result of resonant spin excitations in isolated atoms (light doping) or exchange coupled clusters (moderate to high doping). The loss tangent can be drastically reduced by applying static magnetic fields. Our measurements also show that this mechanism significantly contributes to room temperature loss, but does not dominate.

AB - Commercial manufacturers add transition metals and other impurities to high performance microwave ceramic compounds to improve their manufacturability. Measurements of microwave loss tangent were performed on Ba(Zn 1/3Ta2/3)O3, ZrTiO4-ZnNb 2O6, Ba(Zn1/3Nb2/3)O3, and BaTi4O9-BaZn2Ti4O11 ceramics. A marked increase in the loss at low temperatures is found in materials containing transition metal with unpaired d-electrons as a result of resonant spin excitations in isolated atoms (light doping) or exchange coupled clusters (moderate to high doping). The loss tangent can be drastically reduced by applying static magnetic fields. Our measurements also show that this mechanism significantly contributes to room temperature loss, but does not dominate.

UR - http://www.scopus.com/inward/record.url?scp=84871750784&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84871750784&partnerID=8YFLogxK

U2 - 10.1063/1.4772491

DO - 10.1063/1.4772491

M3 - Article

VL - 101

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 25

M1 - 252901

ER -