公开(公告)号：US09938197B2

公开(公告)日：2018-04-10

申请号：US14780235

申请日：2014-03-11

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Masato Yamazaki ,  Takayuki Matsuoka ,  Kazuaki Kitamura ,  Hisashi Kozuka ,  Hideto Yamada ,  Toshiaki Kurahashi ,  Yasuyuki Okimura ,  Kazushige Ohbayashi ,  Takashi Kasashima

IPC: H01L41/187 ,  C04B35/00 ,  C04B35/495 ,  G01L23/22 ,  H01L41/43 ,  H01L41/113 ,  H01L41/047 ,  H01L41/08 ,  H01L41/09 ,  H03H9/02

CPC classification number: C04B35/495 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3215 ,  C04B2235/3232 ,  C04B2235/3234 ,  C04B2235/3236 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3262 ,  C04B2235/3272 ,  C04B2235/3279 ,  C04B2235/3281 ,  C04B2235/3284 ,  C04B2235/3293 ,  C04B2235/3294 ,  C04B2235/3418 ,  C04B2235/602 ,  C04B2235/768 ,  C04B2235/80 ,  G01L23/222 ,  H01L41/047 ,  H01L41/08 ,  H01L41/09 ,  H01L41/1132 ,  H01L41/187 ,  H01L41/1873 ,  H01L41/43 ,  H03H9/02031

Abstract: A lead-free piezoelectric ceramic composition includes a first crystal phase made of an alkali niobate/tantalate type perovskite oxide having piezoelectric properties, and a second crystal phase made of an M-Ti—O spinel compound (where the element M is a monovalent to quadrivalent element).

公开(公告)号：US10340441B2

公开(公告)日：2019-07-02

申请号：US15129877

申请日：2015-03-05

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hisashi Kozuka ,  Hideto Yamada ,  Takayuki Matsuoka ,  Kazuaki Kitamura ,  Masato Yamazaki ,  Toshiaki Kurahashi ,  Takashi Kasashima ,  Yasuyuki Okimura ,  Kazushige Ohbayashi

IPC: H01L41/047 ,  H01L41/187 ,  H01L41/43 ,  C04B35/495 ,  C04B35/64

Abstract: A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide subphase. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase assumes a value in a range represented by 0.40 direction with the main phase represented as a pseudo-cubic crystal system.

公开(公告)号：US09871187B2

公开(公告)日：2018-01-16

申请号：US14682631

申请日：2015-04-09

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Masato Yamazaki ,  Takayuki Matsuoka ,  Yoshiteru Honda ,  Kazuaki Kitamura ,  Hisashi Kozuka ,  Toshiaki Kurahashi ,  Yasuyuki Okimura ,  Hideto Yamada ,  Kazushige Ohbayashi

IPC: H01L41/187 ,  H01L41/43 ,  C04B35/495

CPC classification number: H01L41/1873 ,  C04B35/495 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3215 ,  C04B2235/3217 ,  C04B2235/3225 ,  C04B2235/3232 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3258 ,  C04B2235/3262 ,  C04B2235/3272 ,  C04B2235/3275 ,  C04B2235/3284 ,  C04B2235/602 ,  C04B2235/768 ,  C04B2235/80 ,  H01L41/43

Abstract: A lead-free piezo-electric porcelain composition which contains a main phase having voids and which is formed of a first crystal phase composed of an alkali niobate/tantalate-based perovskite oxide having piezo-electric characteristics; and a sub-phase containing a second crystal phase composed of an A2B6O13-based compound (where the element A is a monovalent element and the element B is one or more divalent to hexavalent elements). The sub-phase fills voids present in the main phase.

公开(公告)号：US10347817B2

公开(公告)日：2019-07-09

申请号：US15129943

申请日：2015-03-05

Applicant: NGK SPARK PLUG CO., LTD.

Inventor： Hisashi Kozuka ,  Hideto Yamada ,  Takayuki Matsuoka ,  Kazuaki Kitamura ,  Masato Yamazaki ,  Toshiaki Kurahashi ,  Takashi Kasashima ,  Yasuyuki Okimura ,  Kazushige Ohbayashi

IPC: H01L41/18 ,  H01L41/187 ,  H01L41/43 ,  C04B35/495 ,  C04B35/64 ,  H01L41/047

Abstract: A lead-free piezoelectric ceramic composition including an alkali niobate/tantalate perovskite oxide main phase having piezoelectric properties and a different metal oxide. The mole ratio (Na/K) between Na (sodium) and K (potassium) in the main phase is 0.40 direction with the main phase represented as a pseudo-cubic crystal system. Also, the area ratio of a crystal phase reflecting the second spots in the main phase is 33% or less, and the maximum grain size of crystals reflecting the second spots in the main phase is 25 nm or less.