Mitsubishi Materials Corporation

Mitsubishi Denki Kabushiki Kaisha

Nippon Telegraph and Telephone Corporation

Dai Nippon Insatsu Kabushiki Kaisha

Kouichi Ishiyama

Takuo Takeshita

Satoru Mori

Masami Miyake

Yuuki Yoshida

Takanori Endo

Kazunori Igarashi

Tomohiro Mori

Shigeyuki Osawa

Yoshinari Ishii

Takashi Inaguchi

Masashi Nagao

Norikazu Komada

Hideto Yoshimura

Tadashi Yonezawa

Muneaki Watanabe

Seiro Yahata

Ginya Ishiguro

Yasuhiro Hanaue

Kiyoyuki Ookubo

Takeshi Soe

Minoru Nakazato

Yasuaki Yoshioka

Hachiro Saito

Etsuji Kimua

Provided are a sputtering target composed of a Cu&#x2014;Ga sintered compact that has a further reduced oxygen content and can suppress abnormal discharges, and a method for producing the same. The sintered compact has a component composition containing a Ga content of 20 at % or higher and less than 30 at % with the balance being Cu and inevitable impurities, and has an oxygen content of 100 ppm or lower and an average grain size of 100 &#x3bc;m or less, and exhibits the diffraction peaks assigned to the &#x3b3; and &#x3b6; phases of CuGa as observed in X-ray diffraction, wherein the main peak intensity of the diffraction peaks assigned to the &#x3b6; phase is 10% or higher relative to that of the diffraction peaks assigned to the &#x3b3; phase.

Sputtering target and method for producing same

The present invention provides a sputtering target of a Cu&#x2014;Ga sintered body in which the oxygen content is further reduced and the abnormal discharging can be suppressed, and a method for producing the same. The sputtering target according to the present invention is a sintered body having: a texture in which Na compound phases are dispersed in a matrix with a &#x3b3; phase and a &#x3b6; phase of a Cu&#x2014;Ga alloy; and a component composition made of: 20 atomic % to 30 atomic % of Ga; 0.05 atomic % to 10 atomic % of Na; and the Cu balance and inevitable impurities including elements other than Na in the Na compound, wherein an average grain size of the &#x3b3; phase is 30 &#x3bc;m to 100 &#x3bc;m, and an average grain size of the Na compound phases is equal to or less than 8.5 &#x3bc;m.

Cu&#x2014;Ga alloy sputtering target, and method for producing same

According to the present invention, a Cu&#x2014;Ga alloy sputtering target which is a sintered body has a composition with 29.5 atom % to 43.0 atom % of Ga and a balance of Cu and inevitable impurities. A Cu&#x2014;Ga alloy crystal particle in the sintered body has a structure in which &#x3b3; phase particles are dispersed in a &#x3b3;-phase crystal particle. A method for producing the sputtering target includes a step of performing normal pressure sintering by heating a molded body formed of a powder mixture of a pure Cu powder and a Cu&#x2014;Ga alloy powder in a reducing atmosphere, and a step of cooling the obtained sintered body at a cooling rate of 0.1&#xb0; C./min to 1.0&#xb0; C./min, at a temperature having a range of 450&#xb0; C. to 650&#xb0; C.

Cu&#x2014;Ga alloy sputtering target and method for producing same

A burglar detection apparatus has a tag,that includes a resonance circuit. The tag is preferably contained with an object,whose theft is desired to be detected. The tagged object may be placed in a drawer,which is contained in a box,. A tag detection sensor,is installed in the box and detects whether the tag,is present in the drawer,. Also, a drawer sensor,detects whether the drawer is opened. Based on respective detection outputs of the tag detection sensor,and the drawer sensor,, a control circuit,controls an alarm,. Advantageously, the apparatus can be installed in a comparatively small space, does not malfunction even if subjected to large amounts of electrical noise, and reliably detects the presence or absence of a tag even if the tag is located near a metal object.

Apparatus for detecting theft by a radio wave

The resonance frequency of a resonant circuit section does not change even if the surface of an article whose theft is monitored is formed of any material. An antitheft tag mounted on the article (,) whose theft is monitored includes a resonant circuit section resonating with the radio wave having a particular frequency and transmitted from a transmitting antenna. An electromagnetic shield layer formed of an insulating material is interposed between the mounting surface of the article and the resonant circuit section. The electromagnetic shield layer may be formed of ferrite powder or soft magnetic powder which has a particle size of 10 &mgr;m or less and plastic or rubber or may be formed by laminating a first layer composed of a composite material and a second layer composed of plastic or rubber. Preferably, the soft magnetic powder is any of amorphous alloy, Permalloy, soft magnetic iron, silicon steel, Sendust alloy and Fe&mdash;Al alloy.

Theft preventive tag and method for attaching the same

A tag disclosed in this invention detects theft of bills, notes, or securities positioned therewith in a cash register, a safe, or the like. The capability of a tag-detecting sensor is not affected by a conductive or magnetic auxiliary member disposed between the sensor and the tag. The tag for detecting theft, which has one or more resonant circuit sections on an insulating base sheet, is positioned with an article in a specified place. An alarm is not activated when the tag is detected by the sensor, while it is activated when the tag is not detected by the sensor. At least one of the resonant circuit sections is disposed apart from the conductive or magnetic auxiliary member, with respect to the auxiliary member to be disposed between the sensor and the tag. The specified place refers to a case positioned in a cash register or a safe; the article includes bills, notes, or securities; and the auxiliary member is a metal retainer. A fold line is formed on the insulating base sheet, and the resonator circuit sections are arranged apart from the fold line on the sheet.

Theft detecting bag

This invention relates to a magnetic recording powder having a low Curie temperature and a high saturation magnetization (.sigma.s). The magnetic recording powder of this invention is of a composite oxide having a hexagonal ferrite type crystal structure comprises: (a) between 14 and 20 atomic % of at least one of strontium oxide and barium oxide, (b) between 15 and 40 atomic % of chromium oxide, (c) between 2 and 15 atomic % of at least one member of the group consisting of zinc oxide, magnesium oxide and copper oxide, (d) between 2 and 15 atomic % of at least one member of the group consisting of titanium oxide, zirconium oxide and tin oxide, with substantial remainder being iron oxide and unavoidable impurities. Further, the magnetic recording powder of this invention is of a composite oxide having saturation magnetization (.sigma.s) of 15 emu/g or higher, and a Curie temperature (Tc) of 155.degree. C. or lower.

Magnetic recording powder having low curie temperature and high

A magnetic recording powder for use as a material for magnetic recording media including magnetic tapes and magnetic cards, the powder having a high coercive force at room temperatures and a low Curie point, consists of at least one element selected from the group consisting of Y and rare-earth elements (R): 5-20 atomic %, B: 5-20 atomic %, Mn: 4-20 atomic %; and Fe and inevitable impurities: the balance. If required, the powder may further contain Al: 1-10 atomic %, and/or Cr: 1-10 atomic %. The powder has a mean particle size of 0.5-2 .mu.m and a mean crystal grain size of 0.1-0.4 .mu.m.

Magnetic recording powder having a high coercive force at room

The present invention provides heat reserving materials comprising alloys of Ru and at least one rare earth metal which are represented by the formula (I):

Heat reserving materials usuable at very low temperatures

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Saitama, Japan

Kouichi Ishiyama