Dielectric Properties of B 2 O 3 -Doped Nd(Mg 0.5 Sn 0.5 )O 3 Ceramics at Microwave Frequencies

2011

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The microwave dielectric properties of La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics were prepared with a view to their potential for mobile communication. The La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics were prepared by the conventional solid-state method. B 2 O 3 was selected as a liquid sintering aid to reduce the sintering temperature of La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics. The X-ray diffraction patterns of the La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics with 0.25 wt% B 2 O 3 additive exhibited no significant variation of phase with sintering temperature. A maximum dielectric constant and quality factor (Q × f) were obtained for La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 with 0.25 wt% B 2 O 3 additive that were sintered at 1400 • C for 4 h. A temperature coefficient of resonant frequency τ f (−77 ppm/ • C) was measured when La 2.9/3 Ba 0.05 (Mg 0.5 Sn 0.5 )O 3 ceramics with 0.25 wt% B 2 O 3 that were sintered at 1400 • C for 4 h.

Section: Introductionmentioning

confidence: 99%

Influence of B₂O₃Additions and Sintering Temperature on Microwave Dielectric Properties of La_2.9/3Ba_0.05(Mg_0.5Sn_0.5)O₃Ceramics

2011

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“…The advantages of using complex perovskite ceramics A(B 0.5 B 0.5 )O 3 (A = Me 2+ , Me 3+ ; B = Me 2+ , Me 3+ ; B = Me 4+ , Me 5+ , Me 6+ ) are reportedly associated with their excellent dielectric properties at microwave frequencies [3][4][5]. A dielectric constant of 15.6 and a Q × f of 30,600 GHz were obtained for La(Mg 0.5 Sn 0.5 )O 3 ceramics that were sintered at 1500 • C for 4 h [6].…”

Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Properties of La(Mg_0.5-xZn_xSn_0.5)O₃Ceramics

Yao

2011

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The microwave dielectric properties of La Zn x Sn 0.5 )O 3 ceramics were examined with a view to their exploitation for mobile communication. The La(Mg 0.5-x Zn x Sn 0.5 )O 3 ceramics were prepared by the conventional solid-state method with various sintering temperatures. The X-ray diffraction patterns of the La(Mg 0.45 Zn 0.05 Sn 0.5 )O 3 ceramics revealed La(Mg 0.45 Zn 0.05 Sn 0.5 )O 3 is the main crystalline phase, which is accompanied by small amounts of La 2 Sn 2 O 7 as the second phases. Apparent density of 6.59 g/cm 3 , dielectric constant (ε r ) of 19.82 and quality factor (Q × f) of 41,600 GHz were obtained for La(Mg 0.49 Zn 0.01 Sn 0.5 )O 3 ceramics that were sintered at 1550 • C for 4 h.

“…An apparent density of 6.81 g/cm 3 , a permittivity of 18.9, a quality factor of 32,300 (GHz), and a temperature coefficient of resonant frequency of −52.0 ppm/ • C were obtained for Nd(Mg 0.5 Sn 0.5 )O 3 ceramics with 0.25 wt% B 2 O 3 additive sintered at 1500 • C for 4 h [5]. Since the ionic radius of Zn 2+ (0.074 nm) is similar to that of Mg 2+ (0.072 nm) [6], the Mg 2+ ion can be substituted by the Zn 2+ ion to form Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics.…”

Section: Introductionmentioning

confidence: 99%

Microwave Dielectric Properties of CuO-Doped Nd(Mg_0.4Zn_0.1Sn_0.5)O₃Ceramics for Application in Monopole Antenna Loaded with High Permittivity Superstrate

Yao

et al. 2011

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Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics prepared by the conventional solid-state method have been investigated for application in monopole antenna loaded with high permittivity superstrate. CuO was selected as a liquid sintering aid to reduce the sintering temperature of Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics. The X-ray diffraction patterns of the Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics exhibited no significant phase difference with 0.10 and 0.25 wt% CuO additive at different sintering temperatures. A permittivity of 19.5 and a quality factor (Q × f) of 18,600 GHz can be obtained when the Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics with 0.10 wt% CuO additive that were sintered at 1450 • C for 4 h. The temperature coefficient of resonant frequency τ f (−59.0 ppm/ • C) was measured for Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics with 0.10 wt% CuO additive sintered at 1450 • C for 4 h. The measurement result of monopole antenna loaded with high permittivity superstrate at 2.42 GHz was presented. A 18.60% bandwidth (return loss < 10 dB) with a center frequency at approximately 2.42 GHz was successfully achieved.