The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 04, 1986
Filed:
Feb. 29, 1984
Toshio Ogawa, Nagaokakyo, JP;
Murata Manufacturing Co, Ltd., Kyato, JP;
Abstract
A piezoelectric ceramic for acoustic surface wave devices which consists essentially of a solid solution of the ternary system Pb(Sn.sub..alpha. Sb.sub.1-.alpha.)O.sub.3 -PbTiO.sub.3 -PbZrO.sub.3 having a composition showing a phase transition between a ferroelectric rhombohedral low temperature phase (F.sub.R(LT)) and a ferroelectric rohombohedral high temperature phase (F.sub.R(HT)) at a temperature within the range from -20.degree. C. to +80.degree. C. The solid solution consists essentially of a main component expressed by the formula: xPb(Sn.sub..alpha. Sb.sub.1-.alpha.)O.sub.3 -yPbTiO.sub.3 -zPbZrO.sub.3 where in x+y+z=1.00, 1/4.ltoreq..alpha..ltoreq.3/4, and contains, as an additive, manganese in oxide form in an amount of 0.05 to 5.0 wt % when converted into MnO.sub.2 and, if necessary, further contains at least one element selected, from magnesium and chromium in oxide form in respective amounts of 0.05 to 5.0 wt % when respectively converted into MgO and Cr.sub.2 O.sub.3.