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

Lingtao Liu; Alena Matusevich; Chirag Garg; Nathan Newman

doi:10.1063/1.4772491

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

Lingtao Liu, Alena Matusevich, Chirag Garg, Nathan Newman

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

19 Scopus citations

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 _1/3Ta_2/3)O₃, ZrTiO₄-ZnNb ₂O₆, Ba(Zn_1/3Nb_2/3)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 language	English (US)
Article number	252901
Journal	Applied Physics Letters
Volume	101
Issue number	25
DOIs	https://doi.org/10.1063/1.4772491
State	Published - Dec 17 2012

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.4772491

Cite this

@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",

note = "Funding Information: We would like to thank Marco Flores for discussion of scientific issues on EPR, Richard Hanley for improving the electronic performance of our systems, and Lynda Williams for her SIMS measurements. We also greatly acknowledge the Army Research Office for support of this work under Contract W911NF-11-1-0508. The use of facilities in the LeRoy Eyring Center for Solid State Science (LE-CSSS) at Arizona State University is also acknowledged. ",

year = "2012",

month = dec,

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

N1 - Funding Information: We would like to thank Marco Flores for discussion of scientific issues on EPR, Richard Hanley for improving the electronic performance of our systems, and Lynda Williams for her SIMS measurements. We also greatly acknowledge the Army Research Office for support of this work under Contract W911NF-11-1-0508. The use of facilities in the LeRoy Eyring Center for Solid State Science (LE-CSSS) at Arizona State University is also acknowledged.

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

AN - SCOPUS:84871750784

SN - 0003-6951

VL - 101

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 25

M1 - 252901

ER -

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

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this