Structures and microwave dielectric properties of Ca(1-x)Nd2x/3TiO3 ceramics

R. Lowndes; F. Azough; R. Cernik; R. Freer

doi:10.1016/j.jeurceramsoc.2012.05.024

Structures and microwave dielectric properties of Ca(1-x)Nd2x/3TiO3 ceramics

R. Lowndes, F. Azough, R. Cernik, R. Freer

Materials Engineering

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

Abstract

Ca(1-x)Nd2x/3TiO3 microwave dielec. ceramics were prepd. by the mixed oxide route; powders were calcined at 1100°C and sintered at 1450-1500°C. High d., single phase products were obtained for all compns. Grain sizes ranged from 1 μm to 100 μm. There was evidence of significant discontinuous grain growth in mid range compns.; all ceramics were characterized by complex domain structures. With increasing Nd content there was a evidence of a transition from an orthorhombic Pbnm structure to a monoclinic C2/m structure. This was accompanied by a decrease in relative permittivity (εr) from 180 to 78, and decrease in the temp. coeff. of resonant frequency (τf) from +770 ppm K-1 to +200 ppm K-1. The product of dielec. Q value and resonant frequency (Q × f) varied in a grossly non-systematic way, exhibiting a peak at 13,000 GHz in Ca0.7Nd0.2TiO3. [on SciFinder(R)]

Original language	English
Pages (from-to)	3791-3799
Number of pages	9
Journal	J. Eur. Ceram. Soc.
Volume	32
Issue number	14
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2012.05.024 https://doi.org/10.1016/j.jeurceramsoc.2012.05.024
Publication status	Published - Nov 2012

Keywords

Perovskites
Dielectric properties
Electron microscopy
X-ray methods

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@article{2860897570434a82af56595f50c4ba0f,

title = "Structures and microwave dielectric properties of Ca(1-x)Nd2x/3TiO3 ceramics",

abstract = "Ca(1-x)Nd2x/3TiO3 microwave dielec. ceramics were prepd. by the mixed oxide route; powders were calcined at 1100°C and sintered at 1450-1500°C. High d., single phase products were obtained for all compns. Grain sizes ranged from 1 μm to 100 μm. There was evidence of significant discontinuous grain growth in mid range compns.; all ceramics were characterized by complex domain structures. With increasing Nd content there was a evidence of a transition from an orthorhombic Pbnm structure to a monoclinic C2/m structure. This was accompanied by a decrease in relative permittivity (εr) from 180 to 78, and decrease in the temp. coeff. of resonant frequency (τf) from +770 ppm K-1 to +200 ppm K-1. The product of dielec. Q value and resonant frequency (Q × f) varied in a grossly non-systematic way, exhibiting a peak at 13,000 GHz in Ca0.7Nd0.2TiO3. [on SciFinder(R)]",

keywords = "Perovskites, Dielectric properties, Electron microscopy, X-ray methods",

author = "R. Lowndes and F. Azough and R. Cernik and R. Freer",

note = "CAN 158:346339 Electric Phenomena 12049-50-2 (Calcium titanium oxide); 195392-24-6 (Calcium neodymium titanium oxide (Ca1.22Nd0.52Ti2O6)); 400707-40-6 (Calcium neodymium titanium oxide (Ca0.7Nd0.2TiO3)); 1021150-05-9 (Calcium neodymium titanium oxide (Ca0.52Nd0.32TiO3)); 1422284-18-1 (Calcium neodymium titanium oxide (Ca0.1Nd0.6TiO3)); 1422540-43-9 (Calcium neodymium titanium oxide (Ca0.79Nd0.14TiO3)); 1422540-44-0 (Calcium neodymium titanium oxide (Ca0.43Nd0.38TiO3)) Role: PEP (Physical, engineering or chemical process), PRP (Properties), TEM (Technical or engineered material use), PROC (Process), USES (Uses) (structures and microwave dielec. properties of Ca(1-x)Nd2x/3TiO3 ceramics)",

year = "2012",

month = nov,

doi = "10.1016/j.jeurceramsoc.2012.05.024",

language = "English",

volume = "32",

pages = "3791--3799",

journal = "European Ceramic Society. Journal",

issn = "0955-2219",

publisher = "Elsevier BV",

number = "14",

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TY - JOUR

T1 - Structures and microwave dielectric properties of Ca(1-x)Nd2x/3TiO3 ceramics

AU - Lowndes, R.

AU - Azough, F.

AU - Cernik, R.

AU - Freer, R.

N1 - CAN 158:346339 Electric Phenomena 12049-50-2 (Calcium titanium oxide); 195392-24-6 (Calcium neodymium titanium oxide (Ca1.22Nd0.52Ti2O6)); 400707-40-6 (Calcium neodymium titanium oxide (Ca0.7Nd0.2TiO3)); 1021150-05-9 (Calcium neodymium titanium oxide (Ca0.52Nd0.32TiO3)); 1422284-18-1 (Calcium neodymium titanium oxide (Ca0.1Nd0.6TiO3)); 1422540-43-9 (Calcium neodymium titanium oxide (Ca0.79Nd0.14TiO3)); 1422540-44-0 (Calcium neodymium titanium oxide (Ca0.43Nd0.38TiO3)) Role: PEP (Physical, engineering or chemical process), PRP (Properties), TEM (Technical or engineered material use), PROC (Process), USES (Uses) (structures and microwave dielec. properties of Ca(1-x)Nd2x/3TiO3 ceramics)

PY - 2012/11

Y1 - 2012/11

N2 - Ca(1-x)Nd2x/3TiO3 microwave dielec. ceramics were prepd. by the mixed oxide route; powders were calcined at 1100°C and sintered at 1450-1500°C. High d., single phase products were obtained for all compns. Grain sizes ranged from 1 μm to 100 μm. There was evidence of significant discontinuous grain growth in mid range compns.; all ceramics were characterized by complex domain structures. With increasing Nd content there was a evidence of a transition from an orthorhombic Pbnm structure to a monoclinic C2/m structure. This was accompanied by a decrease in relative permittivity (εr) from 180 to 78, and decrease in the temp. coeff. of resonant frequency (τf) from +770 ppm K-1 to +200 ppm K-1. The product of dielec. Q value and resonant frequency (Q × f) varied in a grossly non-systematic way, exhibiting a peak at 13,000 GHz in Ca0.7Nd0.2TiO3. [on SciFinder(R)]

AB - Ca(1-x)Nd2x/3TiO3 microwave dielec. ceramics were prepd. by the mixed oxide route; powders were calcined at 1100°C and sintered at 1450-1500°C. High d., single phase products were obtained for all compns. Grain sizes ranged from 1 μm to 100 μm. There was evidence of significant discontinuous grain growth in mid range compns.; all ceramics were characterized by complex domain structures. With increasing Nd content there was a evidence of a transition from an orthorhombic Pbnm structure to a monoclinic C2/m structure. This was accompanied by a decrease in relative permittivity (εr) from 180 to 78, and decrease in the temp. coeff. of resonant frequency (τf) from +770 ppm K-1 to +200 ppm K-1. The product of dielec. Q value and resonant frequency (Q × f) varied in a grossly non-systematic way, exhibiting a peak at 13,000 GHz in Ca0.7Nd0.2TiO3. [on SciFinder(R)]

KW - Perovskites

KW - Dielectric properties

KW - Electron microscopy

KW - X-ray methods

U2 - 10.1016/j.jeurceramsoc.2012.05.024

DO - 10.1016/j.jeurceramsoc.2012.05.024

M3 - Article

VL - 32

SP - 3791

EP - 3799

JO - European Ceramic Society. Journal

JF - European Ceramic Society. Journal

SN - 0955-2219

IS - 14

ER -

Structures and microwave dielectric properties of Ca(1-x)Nd2x/3TiO3 ceramics

Abstract

Keywords

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