SU1364611A1 - Charge of ferroelectric ceramic material mixture - Google Patents

Abstract

The invention relates directly to electronic industry as well as to radio engineering and can be used in the manufacture of ceramic capacitors. It allows to increase the dielectric constant of the material and extend the range of operating temperatures. To ensure these high characteristics, the material including Pb ,,, Pb Fe,; 2Nb, / jO ,, Pb Tie ,, contains the addition of MpSO3-Mn (OH) g-n in the following ratio of components, wt.%: PbMg ,,, No, „03 86,4l-88,13iPbFe ,, Nb ,, e-3 9.74-9.92; PbTiOj 1.87-3.73; MpSO, - x№i (OH) -n HjO 0.08-0.12. The material has the following properties: go from 16600-18000, operating temperature range from -60 to +125 Ci tgS 0.02- 0.05. The use of this material will make it possible to increase the specific capacity of capacitors manufactured from it and to expand the field of application of capacitors. 2 tab. (L

Description

one

The invention relates to electronic, as well as related and adjacent radio engineering and can be used in the manufacture of ceramic capacitors type II of the group H-90, including for the manufacture of multi-layer monolithic capacitors.

The purpose of the invention is to increase the dielectric constant and expand the working temperature range.

The material from the charge is obtained according to the usual ceramic technology. At first, stoichiometric compounds are synthesized from a mixture of oxides: lead magnoniobate (Pb (Mg, (5Nbi (9) 0), lead ferro-niobate (Pb (Fe ,,. 1) 03) , lead titanium (PbTiO,). At the same time, the synthesis temperature is 750-900 s. The resulting materials are crushed by dry grinding in a vibrating mill for 2-4 hours.

The components of the material are mixed in a mortar in an environment of ethyl alcohol or by dry grinding in a vibrating mill

2

at 1220-1250 ° C in a closed

volume (to prevent lead oxide from evaporating). Silver electrodes are applied to the burned samples by firing silver-containing paste.

In tab. 1 shows the composition of the mixture, in table. 2, respectively, the properties of the material obtained from the mixture.

Invention Formula

The mixture of a ferroelectric ceramic material includes; and Pb (Mg ,, Nb ,,,) 0 ,, Pb (Fe ,,,) 0, FBTiO, and a manganese-containing additive, so that the dielectric constant and expansion of the working temperature range, it contains as an additive MpSON) - nH, jO in the following ratio of components, wt.%:

table 2

Claims (1)

Claim A mixture of a ferroelectric ceramic material including Pb (Mg _{f / i} Nb _z „) O ,, Pb (Fe _{) / 2} Nb, _{/ g} ) 0 ,, PBTiO, and a manganese-containing additive, characterized in that, in order to increase the dielectric permeability and expansion of the working temperature range, it contains as an additive MpCO, · Μη (0Η) ₂ · η N _g 0 in the following ratio, wt.%: Pb (Mg „, Nb _2l ,) 0, Pb (Fe _{l / 2} Nb, _{/ 2} ) 0, PbTiO, MnCO i 'Mn (0H) ₂ · η Η ₂ 0 Τ a 6 components, 86.41-88.13 9.74-9.92 1.87-3.73 0.08-0.12. faces g Composition Content, wt.%, In the composition Pb (Mg, „Nb _{2 (3} ) 0, 1 Pb (Fe _ti2 Nb, _{/ 2} ) 0, PbTiO, MnCO, · Μη (0Η) ₂ · η H ₂ 0 1 86.41 9.74 3.73 0.12 2 88.13 9.92 1.87 0.08 3 87.27 9.83 2.80 0.10 table 2 Composition ^£ 20 ° C & ε / ε,% in the temperature range -60 ... + 125 ° С tg 8 - - Pv20 ° C, Ohm cm 1 16600-17100. -79.1 ... + 8.5 0.005-0.006 (3,5-3,9) X 10 42 2 17100-18000 -78.6 ... + 1.5 0.002-0.003 7.3 x 10 - b 1 x 10 3 16800-18000 -81.6 ... + 2.0 0.003-0.005 (2.0-7.8) X Yu Famous NEW 14145 -7-5 ... + 24.8 * 0.051 * In the temperature range -30 ... + 85 ° С.