High tunable dielectric properties of Zn and Mg alternately doped Ba0.6Sr0.4TiO3 film varactors

Wang, Hongzhe; Dong, Yaoxuan; Wang, Zengmei

doi:10.1016/j.jallcom.2018.02.077

Cited by 19 publications

(4 citation statements)

References 38 publications

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“…In summary, La/Mn codoped BST ceramics were fabricated via a conventional solid-state reaction method and the semi-solution method. The semisolution method played an important role in (Pb,Sr)TiO 3 70 0.001 700 [13] Pb(Zr,Ti)O 3 55 0.001 550 [14] Pb[(Mg,Nb)(Sc,Nb)]O 3 75 0.003 250 [54] Pb(Ni,Nb)O 3 -PbZrO 3 87 0.007 124 [64] Pure BST 45 0.0101 44 [19] Mg-doped BST 22 0.007 31 [65] La-doped BST 74 0.015 49 [26] Mn-doped BST 27 0.0045 60 [66] Fe-doped BST 20 0.003 67 [24] Co-doped BST 32 0.008 40 [67] Zn/Mg codoped BST 46.8 0.0073 64 [68] Mn/Y codoped BST 63.3 0.078 81 [69] La/Fe codoped BST 80.2 0.0038 211 [42] La/Mn co-doped BST 85.0 0.0011 773 This work the microstructures of the BST ceramics. Denser microstructures, more homogeneous grains, and more uniform dopant distributions could be obtained by the semi-solution method.…”

Section: Discussionmentioning

confidence: 99%

Lead-free (Ba,Sr)TiO ₃-based ceramics with superior tunable properties by the semi-solution method

Zhao,

Liu,

Ran

et al. 2024

Journal of Advanced Ceramics

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High-performance dielectric tunable materials with both high dielectric tunability and low dielectric loss are urgently needed for new-generation electronic tunable devices. In the present study, a new system, (Ba 0.675 Sr 0.325 ) 1−x La x Ti 1−x Mn x O 3 (x = 0.25%, 0.5%, 0.75%, and 1.0%), was designed. The acceptor dopant Mn was added to lower dielectric loss, while the donor dopant La was introduced to enhance dielectric tunability. The samples were prepared using the conventional solid-state (CS) reaction method and the semisolution (SS) method. The experimental results showed that the morphology of the ceramics was optimized by further improving the processing procedure. Dense microstructures, homogeneous grains, and uniform dopant distributions could be achieved successfully by the semisolution method. Moreover, a significant enhancement in the tunable properties was realized owing to the improved microstructure mentioned above. The optimum tunable properties occurred in the samples prepared by the semi-solution method at x = 0.75%, with a high dielectric tunability of 85.0%, a low dielectric loss of 0.0011, and an excellent figure of merit (FOM) of 773. The tunable properties of (Ba,Sr)TiO 3 (BST) ceramics were even superior to those of lead-based materials, with an FOM of approximately 700. All the results suggested that the semi-solution method rendered BST ceramics more promising for applications in tunable devices.

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Section: Discussionmentioning

confidence: 99%

Lead-free (Ba,Sr)TiO ₃-based ceramics with superior tunable properties by the semi-solution method

Zhao,

Liu,

Ran

et al. 2024

Journal of Advanced Ceramics

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“…When combined with Figure 4, it can be concluded that the film's ferroelectric property is directly tied to its microstructure, with a thick and compact film providing better ferroelectric properties. According to the literature [58], as the surface roughness lowers, the film capacitance rises and favourable ferroelectric characteristics can be produced due to [25] Sol-gel 1 Hz 4915 1.91 Ba 0.6 Sr 0.4 TiO 3 [48] PLD 1 MHz 232 0.028 Ba 0.6 Sr 0.4 TiO 3 [49] Sol-gel 100 kHz 560 0.022 Ba 0.6 Sr 0.4 TiO 3 [50] RF-magnetron sputtering 1 MHz 324 0.04…”

Section: Ferroelectric Propertiesmentioning

confidence: 99%

Effects of Ba²⁺/Sr²⁺ ratio on the microstructure, dielectric and ferroelectric properties of Ba_xSr_(1−x)TiO₃ films prepared by micro-arc oxidation

Wang

Zuo

et al. 2021

Surface Engineering

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Ba x Sr (1-x) TiO 3 (BST) thin films are in situ deposited on a Ti matrix through the micro-arc oxidation technique, using a mixed aqueous solution of Ba(OH) 2 •8H 2 O, Sr(OH) 2 •8H 2 O and 0.05 M EDTA as the electrolyte. The influence of the Ba 2+ /Sr 2+ ratio on the phase composition, microstructure and properties of the BST thin films is investigated. Ba 0.6 Sr 0.4 TiO 3 , Ba 0.5 Sr 0.5 TiO 3 , and Ba 0.4 Sr 0.6 TiO 3 thin films have a cubic phase, while Ba 0.8 Sr 0.2 TiO 3 and Ba 0.7 Sr 0.3 TiO 3 thin films have a tetragonal phase. When the concentration of Ba 2+ in the electrolyte surpasses that of Sr 2+ , the width of micro-arc holes and the surface roughness of the film grow as the Ba 2+ concentration rises. Furthermore, the dielectric and ferroelectric properties of BST films are favorably connected with the surface morphology. When the Ba 2+ concentration is 0.06 M, the film has the best compactness and smoothness. In addition, the highest capacitance and lowest dielectric loss are achieved.

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“…The various properties can be modi ed by substituting various selected ions on either A site or B site [9,10]. The high tangent loss and permittivity of BST have hindered its application [11]. To meet the requirements, elements of different groups are added or their composites are synthesized to minimize the value of dielectric constant and put down the tangent loss [12].…”

Section: Introductionmentioning

confidence: 99%

Observation of high dielectric properties of Mg-substituted BST ceramic synthesized by conventional solid-state route

Karol

Prakash

Sharma

2021

J Mater Sci: Mater Electron

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Barium Strontium Titanate exhibits ferroelectric or paraelectric behaviour that depends upon the composition and other factors, making it suitable for a number of applications. We have adopted conventional solid state reaction route to synthesize magnesium substituted barium strontium titanate with low concentration of Mg (Mg= 0.005, 0.010 and 0.015). X-ray diffraction has con rmed the perovskite cubic single phase. The dielectric studies were carried out as a function of temperature at different xed frequencies (1kHz, 10kHz, 50kHz and 100kHz) and as a function of frequency at room temperature. The Curie's temperature of pure BST was 96°C and for Mg substituted BST samples it dropped from 85°C to 63°C. The dielectric permittivity rstly suppressed and then maximum value observed for Mg content 0.015 and dielectric loss is also less than one. The remanance (P r ) and coercivity (E c ) are obtained and analysed for ceramics samples. Improvement in dielectric properties due to substitution of Magnesium is observed.

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High tunable dielectric properties of Zn and Mg alternately doped Ba0.6Sr0.4TiO3 film varactors

Cited by 19 publications

References 38 publications

Lead-free (Ba,Sr)TiO ₃-based ceramics with superior tunable properties by the semi-solution method

Lead-free (Ba,Sr)TiO ₃-based ceramics with superior tunable properties by the semi-solution method

Effects of Ba²⁺/Sr²⁺ ratio on the microstructure, dielectric and ferroelectric properties of Ba_xSr_(1−x)TiO₃ films prepared by micro-arc oxidation

Observation of high dielectric properties of Mg-substituted BST ceramic synthesized by conventional solid-state route

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High tunable dielectric properties of Zn and Mg alternately doped Ba0.6Sr0.4TiO3 film varactors

Cited by 19 publications

References 38 publications

Lead-free (Ba,Sr)TiO 3-based ceramics with superior tunable properties by the semi-solution method

Lead-free (Ba,Sr)TiO 3-based ceramics with superior tunable properties by the semi-solution method

Effects of Ba2+/Sr2+ ratio on the microstructure, dielectric and ferroelectric properties of BaxSr(1−x)TiO3 films prepared by micro-arc oxidation

Observation of high dielectric properties of Mg-substituted BST ceramic synthesized by conventional solid-state route

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Lead-free (Ba,Sr)TiO ₃-based ceramics with superior tunable properties by the semi-solution method

Lead-free (Ba,Sr)TiO ₃-based ceramics with superior tunable properties by the semi-solution method

Effects of Ba²⁺/Sr²⁺ ratio on the microstructure, dielectric and ferroelectric properties of Ba_xSr_(1−x)TiO₃ films prepared by micro-arc oxidation