JP4078555B2 - ニオブ酸カリウム堆積体の製造方法 - Google Patents
ニオブ酸カリウム堆積体の製造方法 Download PDFInfo
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- UKDIAJWKFXFVFG-UHFFFAOYSA-N potassium;oxido(dioxo)niobium Chemical compound [K+].[O-][Nb](=O)=O UKDIAJWKFXFVFG-UHFFFAOYSA-N 0.000 title claims description 156
- 238000004519 manufacturing process Methods 0.000 title claims description 23
- 239000000758 substrate Substances 0.000 claims description 121
- 229910052594 sapphire Inorganic materials 0.000 claims description 48
- 239000010980 sapphire Substances 0.000 claims description 48
- 239000013078 crystal Substances 0.000 claims description 44
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 32
- 239000000395 magnesium oxide Substances 0.000 claims description 22
- 239000006104 solid solution Substances 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 9
- 230000010287 polarization Effects 0.000 claims description 8
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 2
- 239000010409 thin film Substances 0.000 description 40
- 230000005540 biological transmission Effects 0.000 description 39
- 238000004891 communication Methods 0.000 description 21
- 239000010955 niobium Substances 0.000 description 20
- 238000012545 processing Methods 0.000 description 19
- 230000008878 coupling Effects 0.000 description 16
- 238000010168 coupling process Methods 0.000 description 16
- 238000005859 coupling reaction Methods 0.000 description 16
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 239000012071 phase Substances 0.000 description 14
- 210000002381 plasma Anatomy 0.000 description 14
- 238000010586 diagram Methods 0.000 description 13
- 229910004121 SrRuO Inorganic materials 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- 230000010355 oscillation Effects 0.000 description 9
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 8
- 238000002441 X-ray diffraction Methods 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000001514 detection method Methods 0.000 description 8
- 238000000608 laser ablation Methods 0.000 description 8
- 229910052749 magnesium Inorganic materials 0.000 description 8
- 239000011777 magnesium Substances 0.000 description 8
- 239000000203 mixture Substances 0.000 description 8
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910002367 SrTiO Inorganic materials 0.000 description 6
- 229910052758 niobium Inorganic materials 0.000 description 6
- 239000003960 organic solvent Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910052712 strontium Inorganic materials 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000151 deposition Methods 0.000 description 4
- 230000001678 irradiating effect Effects 0.000 description 4
- 229910052746 lanthanum Inorganic materials 0.000 description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000002128 reflection high energy electron diffraction Methods 0.000 description 4
- 239000011734 sodium Substances 0.000 description 4
- 229910018921 CoO 3 Inorganic materials 0.000 description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 125000004429 atom Chemical group 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000005238 degreasing Methods 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 229910001882 dioxygen Inorganic materials 0.000 description 3
- 235000019441 ethanol Nutrition 0.000 description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical group [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 229920006332 epoxy adhesive Polymers 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 229910052741 iridium Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000001459 lithography Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 125000004430 oxygen atom Chemical group O* 0.000 description 2
- 239000006089 photosensitive glass Substances 0.000 description 2
- BITYAPCSNKJESK-UHFFFAOYSA-N potassiosodium Chemical compound [Na].[K] BITYAPCSNKJESK-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052707 ruthenium Inorganic materials 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010897 surface acoustic wave method Methods 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 238000001039 wet etching Methods 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001312 dry etching Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005496 eutectics Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- QUCZBHXJAUTYHE-UHFFFAOYSA-N gold Chemical compound [Au].[Au] QUCZBHXJAUTYHE-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- -1 gold-aluminum Chemical compound 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000002488 metal-organic chemical vapour deposition Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000010363 phase shift Effects 0.000 description 1
- 238000007517 polishing process Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000004506 ultrasonic cleaning Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000001947 vapour-phase growth Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/171—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator implemented with thin-film techniques, i.e. of the film bulk acoustic resonator [FBAR] type
- H03H9/172—Means for mounting on a substrate, i.e. means constituting the material interface confining the waves to a volume
- H03H9/174—Membranes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02007—Details of bulk acoustic wave devices
- H03H9/02015—Characteristics of piezoelectric layers, e.g. cutting angles
- H03H9/02031—Characteristics of piezoelectric layers, e.g. cutting angles consisting of ceramic
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/01—Manufacture or treatment
- H10N30/07—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base
- H10N30/074—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing
- H10N30/079—Forming of piezoelectric or electrostrictive parts or bodies on an electrical element or another base by depositing piezoelectric or electrostrictive layers, e.g. aerosol or screen printing using intermediate layers, e.g. for growth control
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10N30/00—Piezoelectric or electrostrictive devices
- H10N30/80—Constructional details
- H10N30/85—Piezoelectric or electrostrictive active materials
- H10N30/853—Ceramic compositions
- H10N30/8542—Alkali metal based oxides, e.g. lithium, sodium or potassium niobates
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49126—Assembling bases
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49147—Assembling terminal to base
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49147—Assembling terminal to base
- Y10T29/49149—Assembling terminal to base by metal fusion bonding
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49117—Conductor or circuit manufacturing
- Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
- Y10T29/49155—Manufacturing circuit on or in base
Description
基板と、
前記基板の上方に形成された電極層と、
前記電極層の上方に形成された、ニオブ酸カリウム層またはニオブ酸カリウム固溶体層と、
を含む。
サファイア基板からなる第1基板上に、岩塩構造の金属酸化物からなるバッファ層を形成する工程と、
前記バッファ層の上方に、多結晶もしくは単結晶のニオブ酸カリウム層またはニオブ酸カリウム固溶体層を形成する工程と、
前記ニオブ酸カリウム層の上方に電極層を形成する工程と、
前記電極層の上方に第2基板を接合する工程と、
前記バッファ層をエッチングで除去して、前記第1基板を分離する工程と、
を含む。
さらに、前記ニオブ酸カリウム層またはニオブ酸カリウム固溶体層の表面を研磨する工程を有することができる。
前記基板の上方に形成された第1電極層と、
前記第1電極層の上方に形成された、ニオブ酸カリウム層またはニオブ酸カリウム固溶体層と、
前記ニオブ酸カリウム層またはニオブ酸カリウム固溶体層の上方に形成された第2電極層と、
を含み、
前記第1および第2電極層は、少なくとも前記空隙部の上方に位置する。
図1(A)〜(E)は、本実施の形態にかかるニオブ酸カリウム堆積体およびその製造方法を模式的に示す断面図である。
図1(E)に示すように、本実施の形態に係るニオブ酸カリウム堆積体100は、基板15と、基板15上に形成された電極層14と、電極層14上に形成されたニオブ酸カリウム層13とを含む。
つぎに、ニオブ酸カリウム堆積体の製造方法について述べる。
(1)第1の実施例
以下の方法によって、ニオブ酸カリウム堆積体を形成した、この実施例では、単相の多結晶ニオブ酸カリウム層を得ることができた。
以下の方法によって、ニオブ酸カリウム堆積体を形成した、この実施例では、単結晶のニオブ酸カリウム層を得ることができた。
図6は、本発明の実施形態かかる圧電薄膜振動子200を模式的に表す断面図である。図6において、図1(E)に示すニオブ酸カリウム堆積体100の部材と実質的に同じ部材には、同一の符号を付す。
図7は、本発明の一実施形態にかかる周波数発振器の回路構成を示すブロック図である。図7は、前述した本発明にかかる圧電薄膜振動子を用い、周波数可変の該圧電薄膜振動子を利用した電圧制御発振器(Voltage Controlled Oscillator:VCO)の構成例を示している。この回路はトランジスタTrとそのまわりのいくつかの受動部品により、コルピッツ型の発振器を構成している。トランジスタTrのベースには、キャパシタC3を介して圧電薄膜振動子200が接続されている。圧電薄膜振動子200は、さらにグランドに接地されている。圧電薄膜振動子200に、抵抗R1を介して周波数制御用の直流電圧が加えられると、電圧の大きさに応じて、共振周波数、反共振周波数が変化する。そのため、これらの周波数とキャパシタC1、C2、C3で決まる発振回路の発振周波数を変化させることができる。
4.1.第1の例
図9は、本発明の一実施形態にかかる電子回路の電気的構成を示すブロック図である。なお、図9に示した電子回路は、例えば、図10に示す携帯電話機1000の内部に設けられる回路である。図10は、本発明の一実施形態にかかる電子機器の一つとして携帯電話機の外観の一例を示す斜視図である。図10に示した携帯電話機1000は、アンテナ101、受話器102、送話機103、液晶表示部104、および操作ボタン105等を備えている。
図13は、本発明の一実施形態にかかる電子回路の電気的構成を示すブロック図である。なお、図13に示したブロック図は、例えば、図11,図12に示すリーダライタ2000に設けられる回路図である。
Claims (8)
- サファイア基板からなる第1基板上に、酸化マグネシウムからなるバッファ層を形成する工程と、
前記バッファ層の上方に、多結晶もしくは単結晶のニオブ酸カリウム層またはK 1−x Na x Nb 1−y Ta y O 3 (0<x<1、0<y<1)で表されるニオブ酸カリウム固溶体層を形成する工程と、
前記ニオブ酸カリウム層の上方に電極層を形成する工程と、
前記電極層の上方に第2基板を接合する工程と、
前記バッファ層をエッチングで除去して、前記第1基板を分離する工程と、
を含む、ニオブ酸カリウム堆積体の製造方法。 - 請求項1において、
前記ニオブ酸カリウム層は、分極軸が前記第1基板に対して平行なドメインを含む、ニオブ酸カリウム堆積体の製造方法。 - 請求項1または2において、
前記ニオブ酸カリウム層は、斜方晶ニオブ酸カリウムの格子定数を21/2c<a<bとし、かつb軸が分極軸であるとき、(110)または(001)配向でエピタキシャル成長しているドメインを含む、ニオブ酸カリウム堆積体の製造方法。 - 請求項1ないし3のいずれかにおいて、
前記サファイア基板は、R面(1−102)である、ニオブ酸カリウム堆積体の製造方法。 - 請求項1ないし4のいずれかにおいて、
前記酸化マグネシウムは、立方晶(100)配向でエピタキシャル成長している、ニオブ酸カリウム堆積体の製造方法。 - 請求項5において、
前記酸化マグネシウムの[100]方向ベクトル、および前記ニオブ酸カリウム層の(110)配向でエピタキシャル成長しているドメインの[110]方向ベクトルあるいは(001)配向でエピタキシャル成長しているドメインの[001]方向ベクトルは、前記サファイア基板のR面(1−102)の法線ベクトルに対して傾いている、ニオブ酸カリウム堆積体の製造方法。 - 請求項6において、
前記酸化マグネシウムの[100]方向ベクトル、および前記ニオブ酸カリウム層の(110)配向でエピタキシャル成長しているドメインの[110]方向ベクトルあるいは(001)配向でエピタキシャル成長しているドメインの[001]方向ベクトルは、前記サファイア基板のR面(1−102)の法線ベクトルに対して、1度以上20度以下の角度で傾いている、ニオブ酸カリウム堆積体の製造方法。 - 請求項1ないし7のいずれかにおいて、
さらに、前記ニオブ酸カリウム層または前記ニオブ酸カリウム固溶体層の表面を研磨する工程を有する、ニオブ酸カリウム堆積体の製造方法。
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