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NIST Structural Ceramics Database (SCD) Database

NIST Standard Reference Database 30

Last Update to Data Content: 2002

DOI: http://dx.doi.org/10.18434/T4F30D

SCD Citation Number: Z00793

Bibliographic Information

Reference:
"Heat Capacity Measurement of VO1±x and Niobium Doped VO1+x," T. Matsui, T. Tsuji, T. Asano, and K. Naito, Thermochimica Acta, Vol. 183, pp. 1-14 (1991), published by Elsevier Science B.V..
Language: English

General Materials Processing Notes

SCD Citation Number: Z00793
"Vanadium metal powder and V2O3 powder were used for the preparation of the VO1±x samples. The purity of the vanadium metal powder was higher than 99.99%. The V2O3 powder was prepared by reducing V2O5 powder, of purity higher than 99.99%, at 873 K for 6 h and then at 1173 K for 18 h in a hydrogen gas stream. The appropriate amounts of V metal and V2O3 powders were mixed and pressed into pellets. For the preparation of the sample buttons of VO1+x doped with Nb, niobium metal (purity >99.99%), V metal and V2O3 powders were mixed and pressed into pellets. The pellets thus prepared for VO1±x and (V,Nb)O1+x were melted several times using an Ar plasma jet furnace. Sample buttons made in the plasma jet furnace were annealed at 1173 K for one week in evacuated and sealed quartz tubes, and then cooled down to room temperature over a period of one week. The annealed button was then crushed into pieces less than 3 mm in size using a stainless-steel mortar, and then sealed in a small quartz vessel for the heat capacity measurements."

Measurement Methods

Adiabatic calorimeter
The authors cite K. Naito et al., J. Phys. E, Vol. 7, 464 (1974), and summarize the procedure as follows. "Heat capacity was measured with an adiabatic scanning calorimeter in this calorimeter, the power supplied to the sample was measured continuously and the heating rate was kept constant during the measurements regardless of the kind and amount of sample. The heating rate was chosen to be 2 K min-1 for most samples except VO1.063 and both 2 K min-1 and 1 K min-1 were chosen for VO1.267. The heat capacity measurement was carried out from 323 K to 920 K under a pressure of about 130 Pa. The crushed sample was sealed in a quartz vessel filled with helium gas at about 20 kPa. The amount of sample used for the measurement was about 13 g for each experiment. The heat capacity measurement was conducted within an imprecision of ±3%."
Chemical analysis
"The O/V ratios... were determined from the weight gain of the samples after oxidizing them to V2O5 and V2O5 + Nb2O5 respectively at 923 K for 4 weeks. For the doped VO sample, the metal ratio Nb/(V + Nb) was determined by means of X-ray florescence analysis."

Index of Materials and Properties (Click on a selected Material Number to expand material properties menu)

Material Number 1: VOx

Material Specification and Properties for VOx

Material number 1 of 2
in SCD Citation Number: Z00793
Chemical Class: Oxide
Chemical Family: V-O
Formula: VOx
Informal Name: vanadium oxide
Structure Type: Polycrystalline
Manufacturer: In-House
Process: Solid State Reaction

VOx

Material number 1 of 2
in SCD Citation Number: Z00793
Specific Heat
y of Nby
 
( formula units ) 		x of Ox
 
( formula units ) 		Temperature
 
( K ) 		Molar Heat
Capacity
( J mol-1 K-1 ) 		Specific
Heat
( J kg-1 K-1 )
0 0.883 324 23.53 361.6
0 0.883 332 26.47 406.8
0 0.883 341 28.68 440.8
0 0.883 351 32.35 497.2
0 0.883 359 35.29 542.3
0 0.883 368 38.24 587.7
0 0.883 383 41.91 644.1
0 0.883 393 44.12 678.0
0 0.883 400 44.85 689.3
0 0.883 410 47.79 734.5
0 0.883 422 49.26 757.0
0 0.883 434 50.74 779.8
0 0.883 441 52.94 813.6
0 0.883 451 53.68 825.0
0 0.883 466 54.41 836.2
0 0.883 478 56.62 870.2
0 0.883 485 56.62 870.2
0 0.883 495 57.35 881.4
0 0.883 505 57.35 881.4
0 0.883 520 57.35 881.4
0 0.883 529 56.62 870.2
0 0.883 532 55.88 858.8
0 0.883 541 55.15 847.6
0 0.883 549 53.68 825.0
0 0.883 556 53.68 825.0
0 0.883 566 52.94 813.6
0 0.883 578 52.21 802.4
0 0.883 588 52.28 803.5
0 0.883 595 52.32 804.1
0 0.883 605 52.39 805.1
0 0.883 612 52.43 805.8
0 0.883 620 52.49 806.7
0 0.883 632 52.56 807.8
0 0.883 646 52.66 809.3
0 0.883 659 52.74 810.5
0 0.883 661 52.75 810.7
0 0.883 668 52.80 811.4
0 0.883 680 52.88 812.7
0 0.883 695 52.98 814.2
0 0.883 712 53.09 815.9
0 0.883 727 53.19 817.4
0 0.883 739 53.27 818.7
0 0.883 759 53.40 820.7
0 0.883 771 53.48 821.9
0 0.883 783 53.56 823.1
0 0.883 793 53.62 824.0
0 0.883 802 53.68 825.0
0 0.883 807 54.41 836.2
0 0.883 812 54.41 836.2
0 0.883 822 55.15 847.6
0 0.883 837 55.88 858.8
0 0.883 844 57.35 881.4
0 0.883 851 59.56 915.3
0 0.883 859 61.03 937.9
0 0.883 866 63.24 971.9
0 0.883 873 64.71 994.5
0 0.883 880 66.91 1028
0 0.883 885 69.12 1062
0 0.883 890 70.59 1085
0 0.883 898 71.32 1096
0 0.883 905 72.06 1107
0 0.883 912 70.59 1085
0 0.883 917 69.85 1073
0 0.883 920 67.65 1040
0 1.063 324 23.53 346.3
0 1.063 332 26.47 389.6
0 1.063 337 28.68 422.1
0 1.063 341 30.15 443.7
0 1.063 349 32.35 476.1
0 1.063 354 34.56 508.6
0 1.063 361 36.76 541.0
0 1.063 366 38.24 562.8
0 1.063 373 39.71 584.4
0 1.063 380 41.91 616.8
0 1.063 385 43.38 638.4
0 1.063 393 44.85 660.1
0 1.063 400 45.59 670.9
0 1.063 407 47.06 692.6
0 1.063 412 48.53 714.2
0 1.063 424 50.74 746.7
0 1.063 434 52.21 768.4
0 1.063 441 52.94 779.1
0 1.063 446 54.41 800.7
0 1.063 454 55.15 811.6
0 1.063 466 55.88 822.4
0 1.063 471 57.35 844.0
0 1.063 480 58.09 854.9
0 1.063 490 59.56 876.5
0 1.063 498 61.03 898.2
0 1.063 510 62.50 919.8
0 1.063 522 62.50 919.8
0 1.063 532 62.50 919.8
0 1.063 541 62.50 919.8
0 1.063 551 61.76 908.9
0 1.063 559 61.03 898.2
0 1.063 563 60.29 887.3
0 1.063 576 58.82 865.7
0 1.063 588 58.09 854.9
0 1.063 595 57.35 844.0
0 1.063 605 56.62 833.3
0 1.063 615 55.88 822.4
0 1.063 627 55.93 823.1
0 1.063 644 56.01 824.3
0 1.063 651 56.04 824.7
0 1.063 654 56.05 824.9
0 1.063 656 56.06 825.0
0 1.063 661 56.08 825.3
0 1.063 673 56.14 826.2
0 1.063 688 56.20 827.1
0 1.063 700 56.25 827.8
0 1.063 710 56.30 828.6
0 1.063 720 56.34 829.2
0 1.063 732 56.40 830.0
0 1.063 746 56.46 830.9
0 1.063 761 56.52 831.8
0 1.063 773 56.58 832.7
0 1.063 783 56.62 833.3
0 1.063 795 57.35 844.0
0 1.063 805 58.09 854.9
0 1.063 812 59.56 876.5
0 1.063 820 59.56 876.5
0 1.063 827 61.03 898.2
0 1.063 834 62.50 919.8
0 1.063 841 63.97 941.4
0 1.063 849 65.44 963.1
0 1.063 854 66.91 984.7
0 1.063 861 69.85 1028
0 1.063 866 72.06 1061
0 1.063 873 72.79 1071
0 1.063 878 74.26 1093
0 1.063 883 75.00 1104
0 1.063 885 75.00 1104
0 1.063 893 74.26 1093
0 1.063 902 73.53 1082
0 1.063 910 72.79 1071
0 1.063 917 72.06 1061
0 1.063 920 71.32 1050
0 1.063 924 70.59 1039
0 1.267 324 25.74 361.5
0 1.267 329 27.94 392.3
0 1.267 332 30.15 423.4
0 1.267 334 32.35 454.3
0 1.267 341 34.56 485.3
0 1.267 346 36.76 516.2
0 1.267 351 38.24 537.0
0 1.267 359 41.91 588.5
0 1.267 361 44.12 619.6
0 1.267 368 46.32 650.4
0 1.267 373 47.79 671.1
0 1.267 378 48.53 681.5
0 1.267 385 50.00 702.1
0 1.267 390 52.21 733.2
0 1.267 395 55.15 774.4
0 1.267 398 58.09 815.7
0 1.267 400 60.29 846.6
0 1.267 402 63.24 888.0
0 1.267 405 66.18 929.3
0 1.267 407 68.38 960.2
0 1.267 410 70.59 991.3
0 1.267 415 72.06 1012
0 1.267 415 73.53 1033
0 1.267 420 74.26 1043
0 1.267 434 74.11 1041
0 1.267 446 73.99 1039
0 1.267 459 73.85 1037
0 1.267 471 73.73 1035
0 1.267 480 73.63 1034
0 1.267 490 73.53 1033
0 1.267 507 72.06 1012
0 1.267 515 71.32 1002
0 1.267 524 69.12 970.6
0 1.267 532 67.65 950.0
0 1.267 541 66.18 929.3
0 1.267 551 65.44 918.9
0 1.267 559 63.97 898.3
0 1.267 566 63.24 888.0
0 1.267 578 62.50 877.7
0 1.267 595 61.76 867.3
0 1.267 607 61.81 868.0
0 1.267 617 61.86 868.7
0 1.267 624 61.89 869.1
0 1.267 637 61.95 869.9
0 1.267 649 62.00 870.6
0 1.267 654 62.02 870.9
0 1.267 659 62.05 871.3
0 1.267 661 62.05 871.3
0 1.267 678 62.13 872.5
0 1.267 695 62.21 873.6
0 1.267 705 62.25 874.1
0 1.267 717 62.30 874.8
0 1.267 724 62.34 875.4
0 1.267 732 62.37 875.8
0 1.267 734 62.38 876.0
0 1.267 739 62.40 876.2
0 1.267 759 62.49 877.5
0 1.267 773 62.55 878.4
0 1.267 783 62.60 879.1
0 1.267 795 62.65 879.8
0 1.267 805 62.70 880.5
0 1.267 815 62.74 881.0
0 1.267 829 62.80 881.9
0 1.267 839 62.85 882.6
0 1.267 844 62.87 882.8
0 1.267 854 62.91 883.4
0 1.267 866 62.97 884.3
0 1.267 878 63.02 885.0
0 1.267 888 63.07 885.7
0 1.267 898 63.11 886.2
0 1.267 902 63.13 886.5
0 1.267 915 63.19 887.3
0 1.267 927 63.24 888.0
Measurement Method: Adiabatic calorimeter
Evaluation Status: Qualified by acceptance criteria
Cautions:
Data were digitized from Fig. 1 of the reference.
Material Number 2: V1-yNbyOx

Material Specification and Properties for V1-yNbyOx

Material number 2 of 2
in SCD Citation Number: Z00793
Chemical Class: Oxide
Chemical Family: V-O:Nb
Formula: V1-yNbyOx
Informal Name: vanadium oxide
Structure Type: Polycrystalline
Manufacturer: In-House
Process: Melt Processing

V1-yNbyOx

Material number 2 of 2
in SCD Citation Number: Z00793
Specific Heat
y of Nby
 
( formula units ) 		x of Ox
 
( formula units ) 		Temperature
 
( K ) 		Molar Heat
Capacity
( J mol-1 K-1 ) 		Specific
Heat
( J kg-1 K-1 )
0.02 1.01 325 15.08 222.0
0.02 1.01 332 17.95 264.2
0.02 1.01 339 20.10 295.8
0.02 1.01 343 22.98 338.2
0.02 1.01 352 25.13 369.9
0.02 1.01 359 28.72 422.7
0.02 1.01 368 30.86 454.2
0.02 1.01 380 33.73 496.5
0.02 1.01 387 36.60 538.7
0.02 1.01 394 38.75 570.4
0.02 1.01 406 41.62 612.6
0.02 1.01 413 43.05 633.6
0.02 1.01 422 44.48 654.7
0.02 1.01 429 45.91 675.7
0.02 1.01 441 47.34 696.8
0.02 1.01 452 50.20 738.9
0.02 1.01 459 52.35 770.5
0.02 1.01 466 54.51 802.3
0.02 1.01 478 55.93 823.2
0.02 1.01 487 58.08 854.9
0.02 1.01 494 59.51 875.9
0.02 1.01 501 61.66 907.6
0.02 1.01 508 62.38 918.2
0.02 1.01 520 63.80 939.1
0.02 1.01 534 65.23 960.1
0.02 1.01 544 66.66 981.2
0.02 1.01 553 67.37 991.6
0.02 1.01 558 68.08 1002.1
0.02 1.01 572 68.07 1001.9
0.02 1.01 584 68.05 1001.6
0.02 1.01 594 67.32 990.9
0.02 1.01 601 65.88 969.7
0.02 1.01 608 65.15 958.9
0.02 1.01 613 63.71 937.7
0.02 1.01 620 62.26 916.4
0.02 1.01 627 61.53 905.6
0.02 1.01 637 60.09 884.5
0.02 1.01 651 59.35 873.6
0.02 1.01 661 59.34 873.4
0.02 1.01 675 58.61 862.7
0.02 1.01 687 57.88 851.9
0.02 1.01 699 57.14 841.0
0.02 1.01 709 56.41 830.3
0.02 1.01 723 56.40 830.1
0.02 1.01 740 56.38 829.8
0.02 1.01 752 56.37 829.7
0.02 1.01 764 56.36 829.6
0.02 1.01 778 55.62 818.7
0.02 1.01 792 55.61 818.5
0.02 1.01 807 55.59 818.2
0.02 1.01 814 56.31 828.8
0.02 1.01 821 57.74 849.9
0.02 1.01 828 57.73 849.7
0.02 1.01 835 58.44 860.2
0.02 1.01 847 59.87 881.2
0.02 1.01 854 59.86 881.1
0.02 1.01 854 61.30 902.3
0.02 1.01 861 63.45 933.9
0.02 1.01 865 64.89 955.1
0.02 1.01 870 66.32 976.2
0.02 1.01 875 67.04 986.8
0.02 1.01 877 68.47 1008
0.02 1.01 884 68.46 1008
0.02 1.01 893 69.17 1018
0.02 1.01 898 69.89 1029
0.02 1.01 903 69.88 1029
0.02 1.01 910 70.60 1039
0.02 1.01 920 69.15 1018
0.02 1.01 929 68.42 1007
0.02 1.01 941 67.69 996.3
0.3 1.02 325 11.48 143.8
0.3 1.02 330 13.64 170.8
0.3 1.02 337 16.51 206.8
0.3 1.02 341 18.66 233.7
0.3 1.02 346 20.10 251.7
0.3 1.02 350 22.97 287.7
0.3 1.02 360 25.12 314.6
0.3 1.02 366 27.99 350.5
0.3 1.02 373 30.14 377.5
0.3 1.02 380 32.29 404.4
0.3 1.02 390 35.16 440.3
0.3 1.02 394 36.59 458.2
0.3 1.02 401 38.03 476.3
0.3 1.02 410 40.17 503.1
0.3 1.02 417 42.33 530.1
0.3 1.02 420 43.76 548.0
0.3 1.02 431 45.19 565.9
0.3 1.02 438 46.62 583.8
0.3 1.02 445 48.05 601.8
0.3 1.02 452 49.48 619.7
0.3 1.02 464 51.63 646.6
0.3 1.02 473 53.78 673.5
0.3 1.02 483 55.21 691.4
0.3 1.02 495 55.92 700.3
0.3 1.02 502 57.35 718.2
0.3 1.02 511 58.06 727.1
0.3 1.02 523 59.48 744.9
0.3 1.02 537 60.19 753.8
0.3 1.02 547 60.90 762.7
0.3 1.02 556 61.61 771.6
0.3 1.02 568 61.60 771.4
0.3 1.02 577 61.59 771.3
0.3 1.02 587 61.58 771.2
0.3 1.02 599 62.28 780.0
0.3 1.02 611 62.27 779.8
0.3 1.02 620 62.26 779.7
0.3 1.02 630 60.81 761.5
0.3 1.02 640 60.08 752.4
0.3 1.02 649 59.35 743.3
0.3 1.02 659 59.34 743.1
0.3 1.02 663 60.06 752.2
0.3 1.02 673 59.33 743.0
0.3 1.02 683 57.88 724.9
0.3 1.02 695 57.15 715.7
0.3 1.02 709 57.13 715.5
0.3 1.02 716 56.41 706.4
0.3 1.02 728 56.39 706.2
0.3 1.02 740 56.38 706.1
0.3 1.02 747 56.38 706.1
0.3 1.02 757 55.65 696.9
0.3 1.02 771 56.35 705.7
0.3 1.02 780 55.62 696.6
0.3 1.02 792 55.61 696.4
0.3 1.02 802 55.60 696.3
0.3 1.02 811 56.31 705.2
0.3 1.02 818 57.02 714.1
0.3 1.02 823 57.74 723.1
0.3 1.02 830 57.01 714.0
0.3 1.02 837 56.28 704.8
0.3 1.02 845 56.27 704.7
0.3 1.02 852 56.99 713.7
0.3 1.02 861 59.14 740.6
0.3 1.02 866 60.57 758.5
0.3 1.02 873 62.00 776.5
0.3 1.02 877 61.28 767.4
0.3 1.02 885 61.27 767.3
0.3 1.02 894 61.26 767.2
0.3 1.02 904 61.25 767.1
0.3 1.02 908 61.25 767.1
0.3 1.02 920 61.23 766.8
0.3 1.02 930 61.22 766.7
0.3 1.02 932 61.22 766.7
0.3 1.02 937 60.50 757.7
0.3 1.02 942 59.77 748.5
Measurement Method: Adiabatic calorimeter
Evaluation Status: Qualified by acceptance criteria
Cautions:
Data were digitized from Fig. 2 of the reference.