IntisariPembuatan sampel Ba0,2Sr0,8TiO3 (BST) telah dilakukan dengan metode reaksi fasa padat. Sampel disintering pada suhu 900, 1000, dan 1100• C dengan holding time selama 2 jam. Karakterisasi pada sampel dilakukan menggunakan X-Ray Diffraction (XRD). Besarnya konstanta dielektrik diperoleh melalui pengujian dengan RLC meter. Berdasarkan analisa dengan perhitungan parameter kisi BST dengan suhu sintering 900, 1000, dan 1100• C adalah a = b = c berturut-turut 3,913, 3,910, dan 3,915 nm. Nilai parameter kisi a = b = c menunjukkan struktur kristal berbentuk kubik. Ukuran kristal dan regangan kisi sampel dengan suhu sintering 900, 1000, dan 1100• C berturut-turut adalah 93 nm, 104 nm, 110 nm dan 1,58%, 1,51%, 1,49%. Pengukuran konstanta dielektrik (K) dilakukan pada rentang frekuensi 0,01 hingga 10 kHz. Nilai maksimum terdapat pada nilai frekuensi minimum. Nilai K sampel dengan suhu sintering 900, 1000, dan 1100• C masing-masing sebesar 1388, 3299 dan 3870 pada frekuensi minimum. AbstractBa0,2Sr0,8TiO3 samples have been fabricated by solid state reaction. The samples were sintered at temperature 900, 1000, and 1100• C for 2 hours. Characterization of sample using XRD. The analysis exibits that the cubic lattice parameter of BST sintered at 900, 1000, and 1100• C are a = b = c respectively 3.913, 3.910, 3.915 nm. The particle sizes and lattice strains of sampel sintered at 900, 1000, and 1100• C respectively 93 nm, 104 nm, 110 nm and 1,58%, 1,51%, 1,49%. Dielectric constant (K) measurements were performed at the range of frequency 0.01 to 10 kHz where the values are maximum at a minimum frequency. The K values for samples sintered at 900, 1000, and 1100• C at minimum frequency are 1388, 3299 and 3870 respectively.

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This research aims to: (1) developing physics module based on scientific to improve student’s critical thinking competency, (2) knowing the appropriateness of physics learning module based on scientific. The research type that is used is the type of development research (Research and Development), and the model of module development that is used is 4-D (four D model) consisting of Define, Design, Develop and Disseminate that is stated by Thiagarajan. The learning module based on scientific is arranged for the learning participants actively construct the concept, the law or principle through 5 stages of 5 M which are mengamati (observing), menanya (interviewing), mencoba (trying), menalar (reasoning), and mengkomunikasikan (communicating). The module is judged based on the appropriateness of material, media, and language and limited trials and wide trials to the student and the stage of spread in the MGMP forum. The data collection uses the questionnaire of necessity analysis, the form of module validation, the questionnaire of trial response (limited and spacious), the questionnaire of disseminate response, and the test of critical thinking. The results of the research are as follow: (1) physics module based on scientific to improve the student’s critical thinking competency having a characteristic which is learning the learning stage on the module is adapted with scientific learning stage in each of the stage and loads the test question of critical thinking, (2) the module is categorized feasible with the counting result (material expert, media expert, linguist, teacher, and colleague) showing the average value which is 85 >cut off 84. Also, it is supported by the student’s positive response and the disseminate result that is conducted in MGMP forum that categorizes that the module is very good. Based on the research it can be concluded that the physics module based on scientific to improve the students’ critical thinking competency that is developed is feasible to use as the source of physics learning source.

Problem-solving of High Order Thinking Skill (HOTS) problems Mathematics is a part of the mathematics learning process that requires high-level adversity quotient (AQ) for students. This study aims to analyze the AQ level of students in solving mathematics HOTS problems. This research uses a case study-based qualitative approach. Research participants consisted of 47 students of class XI at an MA in East Lombok, NTB, in the even semester of the 2020-2021 academic year. The research sample was determined by purposive sampling. The instrument used was a diagnostic test consisting of descriptive questions and multiple-choice, AQ questionnaire, and interview guidelines. The results showed that: 1) the AQ level of the students was in the medium category in solving HOTS mathematics questions, 2) there was no relationship between the level of mathematics problem-solving ability and the AQ level of students in solving the HOTS mathematics problems, 3) the students quickly gave up in solving HOTS mathematics questions, and 4) Students have difficulty in the aspects of language, concepts, and strategies in solving HOTS Mathematics problems.

Pembuatan sampel Ba0,1Sr0,9TiO3 telah dilakukan dengan metode solid state reaction. Sampel di-sintering pada suhu 900oC dan 1000oC. Uji kekristalan dilakukan dengan instrumen X-Ray Diffraction (XRD). RCL Meter untuk mengetahui besarnya konstanta dielektrik. Berdasarkan analisa dengan perhitungan, parameter kisi BST dengan suhu sintering 900°C adalah a=b=c=3,908 nm. Parameter kisi a =b=c=3,909 nm untuk sampel BST dengan suhu sintering 1000°C. Nilai parameter kisi a=b=c menunjukkan struktur kristal berbentuk kubik. Karakterisasi kekristalan yaitu semakin tinggi suhu sintering maka ukuran kristal akan semakin besar. Ukuran kristal dan regangan kisi sampel dengan suhu sintering 900 °C, dan 1000 °C masing-masing sebesar 65 nm, 67 nm dan 0,91%, 0,84%. Untuk konstanta dielektrik (K) dilakukan pengukuran pada rentang frekuensi 0,01 hingga 100 kHz. Nilai K sampel dengan suhu sintering 900 °C, 1000°C masing-masing sebesar 4479, 8720 pada frekuensi 0,01 kHz.