Microwave Dielectric Properties of Tungsten Bronze-Type Ba&lt;sub&gt;6-3&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;&lt;i&gt;R&lt;/i&gt;&lt;sub&gt;8+2&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Ti&lt;sub&gt;18&lt;/sub&gt;O&lt;sub&gt;54&lt;/sub&gt; (&lt;i&gt;R&lt;/i&gt;=La, Pr, Nd and Sm) Solid Solutions

Ohsato, Hitoshi; Mizuta, Makoto; Ikoma, Takashi; Onogi, Yoshinari; Nishigaki, Susumu; Okuda, Takashi

doi:10.2109/jcersj.106.178

Cited by 53 publications

(35 citation statements)

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“…In the case when a defect perovskite Ln 2/3 TiO 3 is stabilized by alkaline-earth ions, for instance barium ions, solid solutions Ba 6−x Ln 8+2x/3 Ti 18 O 54 (known as barium lanthanide titanates -BLTs) with the structure of tetragonal tungsten bronze are formed [7,8]. Both sign and magnitude of temperature coefficient τ of the above materials strongly depend on chemical composition, particularly on the ionic radii of rare-earth elements [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Both sign and magnitude of temperature coefficient τ of the above materials strongly depend on chemical composition, particularly on the ionic radii of rare-earth elements [7][8][9]. Moreover, in the materials Ba 6−x Sm 8+2x/3 Ti 18 O 54 , temperature anomalies of the dependencies of the dielectric parameters ( , tan δ) have been revealed, and have shown a direct effect on the temperature coefficient τ [9].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temperature Trends of the Permittivity in Complex Oxides of Rare-Earth Elements With Perovskite-Type Structure

Belous¹,

Ovchar²,

Mischuk³

2003

Condens. Matter Phys.

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Ceramic materials based on complex oxides with both the perovskite structure (Ln 2/3 Nb 2 O 6 ) and the structure of tetragonal tungsten bronze (Ba 6−x Ln 8+2x/3 Ti 18 O 54 ) have been investigated over a wide frequency and temperature ranges. The results obtained for certain structures denote the presence of the temperature anomalies of dielectric parameters ( , tan δ). These anomalies occur over the wide frequency range including submilimeter (SMM) wavelength range, and are related neither with the processing peculiarities nor with the presence of the phase transitions. Temperature behavior of the permittivity has been considered in terms of the polarization mechanism based on the elastic-strain lattice oscillations. It has been assumed that the observed anomalies could be ascribed to a superposition of harmonic and anharmonic contribution to lattice oscillations that determines τ sign and magnitude.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature Trends of the Permittivity in Complex Oxides of Rare-Earth Elements With Perovskite-Type Structure

Belous¹,

Ovchar²,

Mischuk³

2003

Condens. Matter Phys.

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“…However, the restriction of Q × f and f  values impedes their commercial application [10][11][12][13]. Furthermore, there are a large number of active atoms at the solid solution surface, which has a high interfacial dielectric loss induced by interface polarization [14,15].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and microwave dielectric properties of (Ba1−xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 solid solutions

Huang

Liu

et al. 2017

J Adv Ceram

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“…Ti 18 O 54 solid solutions (known as barium lanthanide titanates -BLTss) are, to date, the most promising candidates for the synthesis of new high--permittivity (ε ≈ 70-100) dielectric ceramics with near--zero temperature coefficient of resonant frequency (τ f ) [1][2][3]. BLTss have the structure of tetragonal tungsten bronze with three types of structural sites in the complex A-sublattice: pentagonal sites filled with Ba 2+ ions, tetragonal sites shared by Ba 2+ and Ln 3+ ions, and empty trigonal sites [4][5][6]. In the BLTss the dielectric properties strongly depend on the size of the A-site ions (r A ) [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…BLTss have the structure of tetragonal tungsten bronze with three types of structural sites in the complex A-sublattice: pentagonal sites filled with Ba 2+ ions, tetragonal sites shared by Ba 2+ and Ln 3+ ions, and empty trigonal sites [4][5][6]. In the BLTss the dielectric properties strongly depend on the size of the A-site ions (r A ) [6,7]. For a fixed x, both the permittivity and dielectric loss (tg δ) demonstrate an increase with the increasing ionic size of rare-earth element from Sm to La [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Low-Loss Microwave Dielectrics for Different Frequency Ranges

Белоус¹,

Ovchar²

2010

Acta Phys. Pol. A

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Depending on the operating frequency range of modern communication systems various microwave elements are required for effective operation of radio equipment. In this work potential ways of developing the microwave dielectric materials for different frequency ranges are discussed. It has been shown that temperature stable dielectrics with the permittivity of about 100, which are intended for the utilization in the decimetre wavelength band, can be developed by means of alio-and isovalent substitution in the cation sublattices of barium lanthanide titanates (BLTss) Ba 6−x Ln 8+2x/3 Ti 18 O 54 (Ln = La-Gd). The temperature behaviour of the permittivity and dielectric loss in the BLTss has been discussed in terms of both harmonic and anharmonic contributions to the phonons of the BLT crystal lattice. It has been shown that a slight deviation from the compositional stoichiometry in both A-site and B-site deficient perovskites Ba(M 2+ 1/3 Nb 2/3 )O 3 (M = Co, Zn, Mg) allows a prominent enhancement of their microwave quality factor (Q). As a consequence, new dielectrics with the extremely high quality factor (Qxf = 90 000-150 000 GHz), which are intended for the utilization in the centimetre wavelength band, can be developed. Some examples of the possible implementation of the developed materials are also discussed.

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Microwave Dielectric Properties of Tungsten Bronze-Type Ba<sub>6-3<i>x</i></sub><i>R</i><sub>8+2<i>x</i></sub>Ti<sub>18</sub>O<sub>54</sub> (<i>R</i>=La, Pr, Nd and Sm) Solid Solutions

Cited by 53 publications

References 0 publications

Temperature Trends of the Permittivity in Complex Oxides of Rare-Earth Elements With Perovskite-Type Structure

Temperature Trends of the Permittivity in Complex Oxides of Rare-Earth Elements With Perovskite-Type Structure

Microstructures and microwave dielectric properties of (Ba1−xSrx)4(Sm0.4Nd0.6)28/3Ti18O54 solid solutions

Low-Loss Microwave Dielectrics for Different Frequency Ranges

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