{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1390282679367376768.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1246/nikkashi.1983.494"}},{"identifier":{"@type":"URI","@value":"https://www.jstage.jst.go.jp/article/nikkashi1972/1983/4/1983_4_494/_pdf"}},{"identifier":{"@type":"NAID","@value":"130004157555"}}],"dc:title":[{"@language":"en","@value":"Dehydration and Condensation of Calcium Hydrogenphosphate Dihydrate"},{"@language":"ja","@value":"リン酸-水素カルシウムニ水和物の脱水縮合"},{"@value":"りん酸一水素カルシウム二水和物の脱水縮合"}],"description":[{"type":"abstract","notation":[{"@language":"en","@value":"The crystal structure of calcium hydrogenphosphate dihydrate (CaHPO<sub>4</sub>·2H<sub>2</sub>O) was analogous to that of gypsum (CaSO<sub>4</sub>·2H<sub>2</sub>O). Its dehydration process was not so simple as that of CaSO<sub>4</sub>·2H<sub>2</sub>O, because 0.5 mol of condensation water was present besides 2.0 mol of crystallization water.<BR>TG-DTA curves of the dihydrate (heating rate, 5-10°C/min) showed three endotherms and weight losses of three steps, which occurred at the temperatures of 140, 160 and 185°C. This finding indicated that the 2.0 mol of crystallization waters had unequal bond strengths to CO+ ions. X-ray diffraction data of samples obtained by the above heating showed only two phases: the dihydrate and the anhydrate, but the formations of di- and tri- phosphate groups were detected in samples heated to about 180°C and 300°C, respectively, from paper chromatographic analysis. Therefore, it was found that the dehydration of the dihydrate, the condensations of the anhydrate and diphosphate proceeded simultaneously parallel to one another. Those di- and tri- phosphate groups were fairly stable so that γ-Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub> crystallized completely before about 600°C.<BR>Although the weight loss of the sample heated at 100°C reached an equilibrium state corresponding to elimination of about 0.5 mol of crystallization water and the formation of some intermediate phase was suggested, the existence of a new phase was not confirmed from X-ray diffraction patterns."},{"@language":"ja","@value":"リン酸-水素カルシウムニ水和物(CaHPO<sub>4</sub>・2H<sub>2</sub>O)は硫酸カルシウムニ水和物(二水セッコウ,CaSO<sub>4</sub>・2H<sub>2</sub>O)と類似の結晶構造を有するが,2.0molの結晶水のほかに0.5molの縮合水を有しているためにその脱水過程は二水セッコウのように単純ではなく複雑である。<BR>二水和物のTG-DTA曲線(加熱速度,5～10℃min)においては140,160,185℃ 付近に3段階の吸熱と減量が認められ,2.0molの結晶水はCa<sup>2+</sup>イオンに対して平等な結合をしていないことが推察された。上記加熱生成物のX線回折結果からは二水和物と無水和物の2相しか認められないが,ペーパークロマトグラフ分析の結果からは180℃付近からニリン酸基が,300℃付近から三リン酸基が出現し,二水和物の脱水と,無水和物の縮合,ニリン酸塩の縮合とが同時に進行していることが明らかとなった。オルトリン酸基および三リン酸基はかなり安定で,γ-Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub>は600℃付近までで完全に結晶化する。100℃ の等温加熱曲線では減量は0.5mol近の結晶水で平衡に達し,なんらかの中間相の生成が示唆されたが,X線回折図形からは新しい結晶相の存在は認められなかった。"}],"abstractLicenseFlag":"disallow"}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1030285133350274818","@type":"Researcher","personIdentifier":[{"@type":"KAKEN_RESEARCHERS","@value":"90059973"},{"@type":"NRID","@value":"1000090059973"},{"@type":"NRID","@value":"9000254364524"},{"@type":"NRID","@value":"9000254363669"},{"@type":"NRID","@value":"9000254363625"},{"@type":"NRID","@value":"9000254363144"},{"@type":"NRID","@value":"9000283684299"},{"@type":"NRID","@value":"9000283689607"},{"@type":"NRID","@value":"9000254878517"},{"@type":"NRID","@value":"9000254878078"},{"@type":"NRID","@value":"9000254879238"},{"@type":"NRID","@value":"9000254879371"},{"@type":"NRID","@value":"9000254363564"},{"@type":"NRID","@value":"9000254363105"},{"@type":"NRID","@value":"9000283684639"},{"@type":"NRID","@value":"9000254879970"},{"@type":"NRID","@value":"9000254364387"},{"@type":"NRID","@value":"9000254364273"},{"@type":"NRID","@value":"9000254363501"},{"@type":"NRID","@value":"9000254879527"},{"@type":"NRID","@value":"9000254879184"},{"@type":"NRID","@value":"9000254879804"},{"@type":"NRID","@value":"9000254877944"},{"@type":"NRID","@value":"9000391868151"},{"@type":"NRID","@value":"9000254364503"},{"@type":"NRID","@value":"9000254364193"},{"@type":"NRID","@value":"9000254364018"},{"@type":"NRID","@value":"9000254363737"},{"@type":"NRID","@value":"9000255707264"},{"@type":"NRID","@value":"9000254880063"},{"@type":"NRID","@value":"9000254879873"},{"@type":"NRID","@value":"9000254879331"},{"@type":"NRID","@value":"9000254878109"},{"@type":"NRID","@value":"9000254363952"},{"@type":"NRID","@value":"9000254363180"},{"@type":"NRID","@value":"9000254880248"},{"@type":"NRID","@value":"9000254880474"},{"@type":"NRID","@value":"9000254878295"},{"@type":"NRID","@value":"9000254879344"},{"@type":"NRID","@value":"9000254879153"},{"@type":"NRID","@value":"9000254879042"},{"@type":"NRID","@value":"9000254879606"},{"@type":"NRID","@value":"9000254879666"},{"@type":"NRID","@value":"9000254878246"},{"@type":"NRID","@value":"9000254363054"},{"@type":"NRID","@value":"9000254364163"},{"@type":"NRID","@value":"9000255705566"},{"@type":"NRID","@value":"9000254878449"},{"@type":"NRID","@value":"9000254878311"},{"@type":"NRID","@value":"9000254878363"},{"@type":"NRID","@value":"9000254879609"},{"@type":"NRID","@value":"9000254877963"},{"@type":"NRID","@value":"9000254363945"},{"@type":"NRID","@value":"9000254363813"},{"@type":"NRID","@value":"9000254363321"},{"@type":"NRID","@value":"9000254363326"},{"@type":"NRID","@value":"9000254363250"},{"@type":"NRID","@value":"9000258633244"},{"@type":"NRID","@value":"9000254878732"},{"@type":"NRID","@value":"9000254879741"},{"@type":"NRID","@value":"9000391850650"},{"@type":"NRID","@value":"9000254364513"},{"@type":"NRID","@value":"9000254364703"},{"@type":"NRID","@value":"9000255704266"},{"@type":"NRID","@value":"9000258633240"},{"@type":"NRID","@value":"9000256036774"},{"@type":"NRID","@value":"9000254880153"},{"@type":"NRID","@value":"9000254879045"},{"@type":"NRID","@value":"9000254878556"},{"@type":"NRID","@value":"9000254879661"},{"@type":"NRID","@value":"9000254363046"},{"@type":"NRID","@value":"9000254363120"},{"@type":"NRID","@value":"9000254363224"},{"@type":"NRID","@value":"9000256042645"},{"@type":"NRID","@value":"9000256043767"},{"@type":"NRID","@value":"9000256034472"},{"@type":"NRID","@value":"9000254878899"},{"@type":"NRID","@value":"9000254879754"},{"@type":"NRID","@value":"9000256436458"},{"@type":"NRID","@value":"9000254880021"},{"@type":"NRID","@value":"9000254878300"},{"@type":"NRID","@value":"9000254878372"},{"@type":"NRID","@value":"9000254879248"},{"@type":"NRID","@value":"9000254878238"},{"@type":"NRID","@value":"9000283115266"},{"@type":"NRID","@value":"9000254364547"},{"@type":"NRID","@value":"9000254363229"},{"@type":"NRID","@value":"9000256035343"},{"@type":"NRID","@value":"9000256032645"},{"@type":"NRID","@value":"9000254879972"},{"@type":"NRID","@value":"9000254878264"},{"@type":"NRID","@value":"9000254878375"},{"@type":"NRID","@value":"9000254877934"},{"@type":"NRID","@value":"9000254364572"},{"@type":"NRID","@value":"9000254363056"},{"@type":"NRID","@value":"9000255705461"},{"@type":"NRID","@value":"9000255708255"},{"@type":"NRID","@value":"9000255706331"},{"@type":"NRID","@value":"9000254878259"},{"@type":"NRID","@value":"9000256422198"},{"@type":"NRID","@value":"9000254363063"},{"@type":"NRID","@value":"9000254364162"},{"@type":"NRID","@value":"9000254363956"},{"@type":"NRID","@value":"9000254363497"},{"@type":"NRID","@value":"9000258632674"},{"@type":"NRID","@value":"9000256032021"},{"@type":"NRID","@value":"9000254878378"},{"@type":"NRID","@value":"9000254878455"},{"@type":"NRID","@value":"9000254878641"},{"@type":"NRID","@value":"9000254878626"},{"@type":"NRID","@value":"9000254363606"},{"@type":"NRID","@value":"9000254363068"},{"@type":"NRID","@value":"9000254879828"},{"@type":"NRID","@valu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Tamotsu"},{"@language":"ja","@value":"安江 任"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"日本大学理工学部工業化学科"},{"@language":"en","@value":"Engineering, Nihon University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410006895524316930","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000256042646"}],"foaf:name":[{"@language":"en","@value":"SUZUKI Toshiko"},{"@language":"ja","@value":"鈴木 聡子"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"日本大学理工学部工業化学科"},{"@language":"en","@value":"Engineering, Nihon University"}]},{"@id":"https://cir.nii.ac.jp/crid/1410006895524316928","@type":"Researcher","personIdentifier":[{"@type":"NRID","@value":"9000256042647"}],"foaf:name":[{"@language":"en","@value":"ARAI Yasuo"},{"@language":"ja","@value":"荒井 康夫"}],"jpcoar:affiliationName":[{"@language":"ja","@value":"日本大学理工学部工業化学科"},{"@language":"en","@value":"Engineering, Nihon University"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"03694577"},{"@type":"EISSN","@value":"21850925"}],"prism:publicationName":[{"@language":"en","@value":"NIPPON KAGAKU KAISHI"},{"@language":"ja","@value":"日本化学会誌（化学と工業化学）"},{"@language":"en","@value":"Nippon Kagaku Kaishi"},{"@language":"ja","@value":"日化"},{"@language":"en","@value":"NIPPON KAGAKU KAISHI"},{"@language":"ja","@value":"日本化学会誌"}],"dc:publisher":[{"@language":"en","@value":"The Chemical Society of Japan"},{"@language":"ja","@value":"公益社団法人 日本化学会"}],"prism:publicationDate":"1983-04-10","prism:volume":"1983","prism:number":"4","prism:startingPage":"494","prism:endingPage":"500"},"reviewed":"false","url":[{"@id":"https://www.jstage.jst.go.jp/article/nikkashi1972/1983/4/1983_4_494/_pdf"}],"availableAt":"1983-04-10","dataSourceIdentifier":[{"@type":"JALC","@value":"oai:japanlinkcenter.org:0019618051"},{"@type":"CROSSREF","@value":"10.1246/nikkashi.1983.494"},{"@type":"CIA","@value":"130004157555"}]}