Thick film fabrication of ferroelectric phase shifter materials

Sengupta, L. C.; Stowell, S.; Ngo, E.

doi:10.1080/10584589608012316

Cited by 18 publications

(12 citation statements)

References 3 publications

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“…To reduce the dielectric constant and dielectric loss, it has been proposed [1,3,4] to use composite materials. However, the effectiveness of using these materials has not been determined because of the absence of information on the possible values of the average control of composites.…”

Section: Control Coefficient Of a Nonlinear Composite Dielectricmentioning

confidence: 99%

“…This quantity characterizes the change in the dielectric properties of a material under the action of a constant electric field, which is used in the design of control devices [1,3,4]. The function ε(E) is usually adopted in the form…”

Section: Control Coefficient Of a Nonlinear Composite Dielectricmentioning

confidence: 99%

“…We consider a composite which consists of a matrix with a periodic system of spherical inclusions. Similar composites of irregular structure were considered in [1,2,4,7,8].…”

Section: Numerical Analysis Of the Problem And Design Of Compositesmentioning

confidence: 99%

“…In the electrotechnical industry, use is made of materials with a nonlinear dependence of the dielectric constant on the intensity of the applied electric field [1][2][3][4]. A characteristic of nonlinearity is the quantity T , which is called the relative control of a nonlinear dielectric [1, 2]:…”

Section: Control Coefficient Of a Nonlinear Composite Dielectricmentioning

confidence: 99%

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Enhancing the controllability of a composite dielectric

Kolpakov

2008

J Appl Mech Tech Phy

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The possibility of increasing the control coefficient of a nonlinear dielectric is studied. Composite structures are designed for which the control coefficient of the composite is considerably (5-20 times) higher than the control coefficients of its components are developed. Control Coefficient of a Nonlinear Composite Dielectric.In the electrotechnical industry, use is made of materials with a nonlinear dependence of the dielectric constant on the intensity of the applied electric field [1][2][3][4]. A characteristic of nonlinearity is the quantity T , which is called the relative control of a nonlinear dielectric [1, 2]:depending on the dimension of the problem]. This quantity characterizes the change in the dielectric properties of a material under the action of a constant electric field, which is used in the design of control devices [1, 3, 4]. The function ε(E) is usually adopted in the formHere ε 0 is the dielectric constant at zero (more precisely, at E → 0). Although experimental curves for large values of E do not coincide with the curve described by dependence (2), the latter can be used for weak fields as an approximation [in many studies, (2) is used for arbitrary field magnitudes]. If the function ε(E) is chosen in the form of (2), formula (1) becomesMaterials with high control coefficients (for the currently used materials, a control coefficient of 10-20% is considered high) are characterized by a large dielectric constant (ε 0 = 500-1000) and fairly large losses [tan δ = (50-100)·10 −4 ].To reduce the dielectric constant and dielectric loss, it has been proposed [1, 3, 4] to use composite materials. However, the effectiveness of using these materials has not been determined because of the absence of information on the possible values of the average control of composites. Tagantsev et al. give the following formulas for calculating the dielectric constant ε mix and control T mix for a medium filled with spheres:(q is the volume fraction of spheres). Formulas (3) are based on the solution of the electrostatic problem for one sphere [5] and were obtained under the assumption of smallness of q. According to (3), the possible increase in the

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Section: Control Coefficient Of a Nonlinear Composite Dielectricmentioning

confidence: 99%

Section: Control Coefficient Of a Nonlinear Composite Dielectricmentioning

confidence: 99%

“…We consider a composite which consists of a matrix with a periodic system of spherical inclusions. Similar composites of irregular structure were considered in [1,2,4,7,8].…”

Section: Numerical Analysis Of the Problem And Design Of Compositesmentioning

confidence: 99%

Section: Control Coefficient Of a Nonlinear Composite Dielectricmentioning

confidence: 99%

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Enhancing the controllability of a composite dielectric

Kolpakov

2008

J Appl Mech Tech Phy

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“…For application in LTCC technology and at microwave frequencies (GHz), appropriate dielectric constant and high Q value are required. Literature survey [9][10][11] reveals that MgO is an effective additive for BST ceramic that decreases dielectric constant and the dissipation factor.…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Mg-Doped Ba_0.6Sr_0.4TiO₃Ceramic Sintered at a Low Temperature with Li₂O Additve

Chou¹,

Zhai²,

Sun³

et al. 2007

Ferroelectrics

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Dielectric properties of Mg-doped Ba 0.6 Sr 0.4 TiO 3 ceramics with the aid of Li 2 O have been investigated. 3.0wt% Li 2 O additive samples can be sintered at 900 • C for 4h and sintering temperature remarkably decrease. Phase and microstructure of these samples were analyzed using XRD and SEM. Results show no obvious secondary phase and decreased grain-size as MgO content increased. Dielectric constant is decreased and the Curie temperature is shifted to low temperature and the peaks are suppressed and broaden with the increase of MgO. Tunability is decreased from about 30% to 15% with MgO content increasing from 0.15wt% to 5.0wt% under applied electric field of 40 kV/cm.

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Effects of B₂O₃–Li₂O additions on the dielectric properties of screen printing Ba_0.6Sr_0.4TiO₃ thick films

Zeng

Gao

Zhang

et al. 2011

Physica Status Solidi (a)

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Ba 0.6 Sr 0.4 TiO 3 (BST) thick films were fabricated on Al 2 O 3 substrate via the screen printing technology by using B 2 O 3 -Li 2 O additions as liquid-phase sintering aids. The effects of doping of B 2 O 3 and Li 2 CO 3 on the phase compositions, microstructures, and dielectric tunable properties of the thick films were investigated systematically. The X-ray diffraction patterns showed that BST diffraction peaks shifted toward higher angle with the B 2 O 3 -Li 2 O doping content, which indicated the substitution of B 3þ and Li þ in Ba 2þ site. It was also found that the grain size and electrical properties of the thick film were strongly affected by the glass content. The grain size and the relative permittivity decreased obviously with the increase of B 2 O 3 -Li 2 O additive. In addition, for the thick film with 4.5 wt% glass content, optimized sintering, and electrical properties were obtained: the sintering temperature of 900 8C, relative permittivity of 312 (at 10 kHz), dielectric loss of 0.0039, tunability of 16.2% (at 3 kV/mm). These good sintering and electrical properties indicate that BST thick film with B 2 O 3 -Li 2 O addition is benefit for the development of LTCC technology and tunable devices.

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Thick film fabrication of ferroelectric phase shifter materials

Cited by 18 publications

References 3 publications

Enhancing the controllability of a composite dielectric

Enhancing the controllability of a composite dielectric

Dielectric Properties of Mg-Doped Ba_0.6Sr_0.4TiO₃Ceramic Sintered at a Low Temperature with Li₂O Additve

Effects of B₂O₃–Li₂O additions on the dielectric properties of screen printing Ba_0.6Sr_0.4TiO₃ thick films

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Thick film fabrication of ferroelectric phase shifter materials

Cited by 18 publications

References 3 publications

Enhancing the controllability of a composite dielectric

Enhancing the controllability of a composite dielectric

Dielectric Properties of Mg-Doped Ba0.6Sr0.4TiO3Ceramic Sintered at a Low Temperature with Li2O Additve

Effects of B2O3–Li2O additions on the dielectric properties of screen printing Ba0.6Sr0.4TiO3 thick films

Contact Info

Product

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Dielectric Properties of Mg-Doped Ba_0.6Sr_0.4TiO₃Ceramic Sintered at a Low Temperature with Li₂O Additve

Effects of B₂O₃–Li₂O additions on the dielectric properties of screen printing Ba_0.6Sr_0.4TiO₃ thick films